Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Prognosis and Detection of Experimental Failures in Open Field Diesel Engines Applying Wiener's Artificial Immunological Systems
1
12
EN
Roberto
Outa
0000-0002-8649-1722
Faculty of Technology of Araçatuba, Department of Biofuels, Av. Prestes Maia, 1764 - Ipanema, Araçatuba, 16052-045, Brazil
roberto.outa@gmail.com
Fábio Roberto
Chavarette
0000-0001-5376-3392
UNESP - Instituto de Química, Department of Engenharia, Física e Matemática, Rua Prof. Francisco Degni, 55 – Quitandinha, Araraquara, 14800-060, Brazil
fabio.chavarette@unesp.br
Paulo Fernando
Toro
0000-0002-6127-0026
Faculty of Technology of Catanduva, Department of Automação Indusrial, Av. Rua Maranhão, 898 - Centro, Catanduva, 15800-020, Brazil
paulo.toro@fatec.sp.gov.br
Aparecido Carlos
Gonçalves
0000-0001-5376-3392
UNESP - Univ. Estadual Paulista, Faculty of Engineering of Ilha Solteira, Department of Mechanical Engineering, Ilha Solteira, 15385-000, Brazil
aparecido.carlos@unesp.br
Lucas Henrique
dos Santos
0000-0002-1348-9728
UNESP - Univ. Estadual Paulista, Faculty of Engineering of Ilha Solteira, Department of Mechanical Engineering, Ilha Solteira, 15385-000, Brazil
lucas@fateccatanduva.edu.br
10.22055/jacm.2020.34972.2525
The high costs of open-field diesel engines arise from the lack of maintenance of these systems. Thus, the maintenance of this equipment has been treated as a great challenge, as some methods of data monitoring are not possible to be implemented, given the inadequate sensing conditions, plant location, local climate, facilities, even the methods and maintenance routines. In a second step, the labor is not qualified and of sufficient quantity to meet the demand, resulting in a slow and inefficient system. One of the challenges of predictive systems is to inform damage and failures in real time of the operating conditions of these machines and equipment. This work demonstrates the possibility of analyzing and detecting failures in open field predictive systems, using the concepts of vibration and acoustics in artificial intelligence. One of the results of this work demonstrates the robustness of the negative selection artificial immune system algorithm, whose application of the Wiener filter was of fundamental need. The other result demonstrates the versatility of conditioned use both or just one of the concepts between vibration and acoustics, in prognosis and fault detection. Considering the versatility of using these two techniques, it is possible to affirm that, the predictive systems of real time analysis have an effective solution directed to the area and, if implemented, it is of low cost and high efficiency.
Vibration,Acoustics,AIS-negative selection,Wiener filter,Predictive system
https://jacm.scu.ac.ir/article_15971.html
https://jacm.scu.ac.ir/article_15971_8993d35085381d5dae4f227e08f7b0eb.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
A Fractal Rheological Model for SiC Paste using a Fractal Derivative
13
18
EN
Yuting
Zuo
0000-0001-5260-6926
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
zuoyuting2020@126.com
Hongjun
Liu
0000-0001-6437-4587
School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, China
28071080@qq.com
10.22055/jacm.2020.34859.2487
The rheological property plays an important role in a free-form extrusion 3D printing process, no rheological model was available in open literature that could effectively take into account effects of both the non-Newtonian viscosity and the concentration of nano/micro particles in a paste. Here a fractal law for non-Newtonian fluids is suggested using a fractal derivative, the law can predict correctly the boundary effect of a viscous flow, and can model effectively the nonlinear velocity distribution across the section. A systematic derivation of a fractal rheological model is suggested using the basic laws in the fluid mechanics, which can provide a deep insight into the two-scale fractal interpretation of non-Newtonian fluids. An experiment was carefully designed to verify the model and to elucidate the relationship between the shear rate and viscosity of the SiC paste. 15wt.%, 25wt.%, 35wt.% and 45wt.% SiC pastes were prepared by using mixing, stirring and ball milling processes. The rheology of the paste can be controlled primarily through the SiC concentration, which affects the fractal order. The fractal model sheds a bright light on a simple but accurate approach to non-Newtonian fluids.
Free-form extrusion,3D printing,SiC paste,rheological properties,fractal derivative,two-scale fractal calculus
https://jacm.scu.ac.ir/article_15793.html
https://jacm.scu.ac.ir/article_15793_cd20ca3e8efe9b7b3647f460b5229f25.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Analysis of Dual Solutions of Unsteady Micropolar Hybrid Nanofluid Flow over a Stretching/Shrinking Sheet
19
33
EN
Nepal Chandra
Roy
0000-0002-5623-9614
Department of Mathematics, University of Dhaka, Dhaka, 1000, Bangladesh
nepal@du.ac.bd
Md. Anwar
Hossain
0000-0002-3929-6211
Department of Mathematics, University of Dhaka, Dhaka, 1000, Bangladesh
anwar.cfd@gmail.com
Ioan
Pop
Department of Applied Mathematics, Babeş-Bolyai University, Cluj-Napoca, Romania
popm.ioan@yahoo.co.uk
10.22055/jacm.2020.34686.2457
An unsteady boundary layer flow of a micropolar hybrid nanofluid over a stretching/shrinking sheet is analyzed. The nonlinear ordinary differential equations of the problem have been solved using the efficient implicit Runge–Kutta–Butcher method along with Nachtsheim–Swigert iteration technique. For a certain set of parameters, numerical results expose dual solutions with the change of the velocity ratio parameter. The dual solutions are presented in a wide range of the physical parameters. Using a lot of numerical data, the critical values of the velocity ratio parameter, local friction factor, local couple-stress and local Nusselt number for the existence of dual solutions are expressed as a function of the physical parameters. These expressions might be useful for the development of new technology or for the future experimental investigation.
Dual solutions,Micropolar Fluid,Hybrid nanofluid,stretching or shrinking sheet
https://jacm.scu.ac.ir/article_15795.html
https://jacm.scu.ac.ir/article_15795_94c4bb952d6345d68b486f7fbee596f2.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Thermoelastic Vibrations of Nonlocal Nanobeams Resting on a Pasternak Foundation via DPL Model
34
44
EN
Mohamed E.
Nasr
0000-0001-6003-4059
Department of Mathematics, College of Science and Arts, Jouf University, Gurayat, Saudi Arabia
mohamed.naser@fsc.bu.edu.eg
Ahmed E.
Abouelregal
0000-0003-3363-7924
Department of Mathematics, College of Science and Arts, Jouf University, Gurayat, Saudi Arabia
ahabogal@gmail.com
Amr
Soleiman
https://orcid.org/0000-0002-8544-457X
Department of Mathematics, College of Science and Arts, Jouf University, Gurayat, Saudi Arabia
amrsoleiman@yahoo.com
Khalil M.
Khalil
0000-0001-6732-1907
Department of Mathematics, College of Science and Arts, Jouf University, Gurayat, Saudi Arabia
khalil.khalil@fsc.bu.edu.eg
10.22055/jacm.2020.34228.2362
The present work introduces the thermoelastic vibrations of nonlocal nanobeams resting on a two-parameter foundation. The governing equations are formulated for linear Winkler–Pasternak foundation type based on the generalized dual-phase-lag heat conduction and nonlocal beams theories. The nanobeam is subjected to a temperature ramping function. The coupled equations of the problem are formulated and solved by Laplace transform technique. The effects of the nonlocal parameter and different foundation parameters on the field variables are illustrated graphically and discussed. The results obtained are consistent with previous analytical and numerical results.
Nanobeams,nonlocal thermoelasticity,ramp-type heating,Foundation
https://jacm.scu.ac.ir/article_15797.html
https://jacm.scu.ac.ir/article_15797_371ebcb8e898ddee3cf618a833f69c02.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Assessment of Drag Reduction Devices Mounted on a Simplified Tractor-Trailer Truck Model
45
53
EN
Terrance
Charles
0000-0002-1159-4532
School of Computing and Engineering, College of Science and Engineering, University of Derby, Derby, UK
t.charles@derby.ac.uk
Zhiyin
Yang
0000-0002-6629-1360
School of Computing and Engineering, College of Science and Engineering, University of Derby, Derby, UK
z.yang@derby.ac.uk
Yiling
Lu
0000-0001-6084-5425
School of Computing and Engineering, College of Science and Engineering, University of Derby, Derby, UK
y.lu@derby.ac.uk
10.22055/jacm.2020.34811.2475
Aerodynamic drag reduction of tractor-trailer combination trucks is critically important to improve their fuel consumption which consequently results in lower emissions. One practical method to reduce aerodynamic drag of a truck is by mounting drag reduction devices on the truck. This paper presents a numerical study of turbulent flow over a simplified tractor-trailer truck with different drag reduction devices mounted on the truck using the Reynolds Averaged Navier-Stokes (RANS) approach to assess the effectiveness of those devices in drag reduction around the tractor-trailer gap region. Three cases with different drag reduction devices have been studied and significant drag reduction (above 30%) has been achieved for all three cases. Detailed analysis of the flow field has been carried out to understand drag reduction mechanisms, and it shows that no matter what drag reduction devices are deployed the drag reduction is mainly due to the reduced pressure on the front face of the trailer, and a small proportion of the drag reduction is due to the reduced turbulent kinetic energy in the gap region.
Tractor-trailer combination truck,Aerodynamic drag,Drag reduction device,Numerical simulation
https://jacm.scu.ac.ir/article_15815.html
https://jacm.scu.ac.ir/article_15815_d66372c2aa596500db4a3824f1fda977.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Role of Magnetic field on the Dynamical Analysis of Second Grade Fluid: An Optimal Solution subject to Non-integer Differentiable Operators
54
68
EN
Muhammad Bilal
Riaz
0000-0001-5153-297X
Department of Mathematics, University of Management and Technology, Lahore, 54000, Pakistan
bilalsehole@gmail.com
Syed Tauseef
Saeed
0000-0002-0971-8364
Department of Science & Humanities, National University of Computer and Emerging Sciences, Lahore Campus, 54000, Pakistan
tauseefsaeed301@gmail.com
Dumitru
Baleanu
0000-0002-0286-7244
Department of Mathematics, Cankaya University, Ankara, 06790, Turkey
dumitru@cankaya.edu.tr
10.22055/jacm.2020.34862.2489
The dynamical analysis of MHD second grade fluid based on their physical properties has stronger resistance capabilities, low-frequency responses, lower energy consumption, and higher sensitivities; due to these facts externally applied magnetic field always takes the forms of diamagnetic, ferromagnetic and paramagnetic. The mathematical modeling based on the fractional treatment of governing equation subject to the temperature distribution, concentration, and velocity field is developed within a porous surfaced plate. Fractional differential operators with and without non-locality have been employed on the developed governing partial differential equations. The mathematical analysis of developed fractionalized governing partial differential equations has been established by means of systematic and powerful techniques of Laplace transform with its inversion. The fractionalized analytical solutions have been traced out separately through Atangana-Baleanu and Caputo-Fabrizio fractional differential operators. Our results suggest that the velocity profile decrease by increasing the value of the Prandtl number. The existence of a Prandtl number may reflect the control of the thickness of momentum and enlargement of thermal conductivity.
Second grade fluid,Fractional differential operator,Magnetic field,Chemical reaction,non-Singular kernels
https://jacm.scu.ac.ir/article_15829.html
https://jacm.scu.ac.ir/article_15829_f6bae300e7c6f6491a9afef4b9223f06.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
The Integrated Analysis of Vibrations of Quartz Crystal Plates through Artificial Coupling Factors
69
77
EN
Qi
Huang
0000-0001-9557-9649
Piezoelectric Device Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, 818 FengHua Road, Ningbo, 315211 Zhejiang, China
hqqh6006@gmail.com
Rongxing
Wu
0000-0003-1401-0544
Department of Architectural Engineering, Ningbo Polytechnic, 1069 Xinda Road, Ningbo, 315800 Zhejiang, China
wurongxing98@163.com
Longtao
Xie
0000-0002-6791-5411
Piezoelectric Device Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, 818 FengHua Road, Ningbo, 315211 Zhejiang, China
xielongtao@nbu.edu.cn
Jianke
Du
Piezoelectric Device Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, 818 FengHua Road, Ningbo, 315211 Zhejiang, China
dujianke@nbu.edu.cn
Ji
Wang
0000-0002-0724-7538
Piezoelectric Device Laboratory, School of Mechanical Engineering and Mechanics, Ningbo University, 818 FengHua Road, Ningbo, 315211 Zhejiang, China
wangji@nbu.edu.cn
10.22055/jacm.2020.34730.2470
We introduce smaller artificial factors into the elastic constants matrix and manage to make Mindlin first-order plate theoryequations of motions coupled for a uniform and integrated analysis. The energy distributions of the five coupled modes are obtained and all the five vibration modes are identified through the energy calculation. This analytical approach based on artificial couplings of vibration modes suggests that all vibration modes of structural components can be analyzed through the same procedure and computer code if the right elastic constants are modified and the mode identification can be done with the energy method. This is a new technique to study multimode vibrations of structures in a broad frequency range with just one procedure and calculation tool for simplification.
Vibration,resonator,Quartz,crystal,plate,Coupling
https://jacm.scu.ac.ir/article_15839.html
https://jacm.scu.ac.ir/article_15839_38cebbe7331a40e8aafcdfacff3a81b6.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
A Variational Principle for a Nonlinear Oscillator Arising in the Microelectromechanical System
78
83
EN
Ji-Huan
He
0000-0002-1636-0559
National Engineering Laboratory for Modern Silk, College of Textile and Engineering, Soochow University, Suzhou, China
hejihuan@suda.edu.cn
Naveed
Anjum
0000-0001-7810-7877
National Engineering Laboratory for Modern Silk, College of Textile and Engineering, Soochow University, Suzhou, China
xsnaveed@yahoo.com
Piotr Sebastian
Skrzypacz
0000-0001-6422-5469
School of Science and Technology, Nazarbayev University, 53 Kabanbay Batyr Ave., Astana, 010000, Kazakhstan
piotr.skrzypacz@nu.edu
10.22055/jacm.2020.34847.2481
A nonlinear oscillator arising in the microelectromechanical system is complex and it is difficult to obtain a variational principle. This paper begins with a wrong variational formulation and uses the semi-inverse method to obtain a genuine variational principle. Additionally, this paper gives simple formula for the fast frequency estimation of the nonlinear oscillator. Only simple calculation is needed to have a relatively high accuracy results when compared with the other methods.
Variational theory,Euler-Lagrange equation,MEMS oscillator,Amplitude-frequency relationship
https://jacm.scu.ac.ir/article_16041.html
https://jacm.scu.ac.ir/article_16041_4ea02fd95a1d5a2556635d40687541ce.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Scaling Law of Permeability and Porosity for Fluid Transport Phenomena in Porous PCM Media
84
92
EN
Yassine
Hariti
0000-0002-7308-8467
LBGIM, Ecole Normale Supérieure, University Hassan II. Casablanca, Morocco
yassinehariti@gmail.com
Ahmed
Hader
0000-0002-0597-2576
LBGIM, Ecole Normale Supérieure, University Hassan II. Casablanca, Morocco
haritiabdellah@gmail.com
Hamza
Faraji
0000-0003-2792-4986
Physics Department, LPMMAT Laboratory, Faculty of Sciences Ain Chock, Hassan II University, BP 5366 Maarif, Casablanca 20000, Morocco
faraji-ham@hotmail.com
Yahia
Boughaleb
0000-0002-1572-0401
LBGIM, Ecole Normale Supérieure, University Hassan II. Casablanca, Morocco
jawad.safar@gmail.com
10.22055/jacm.2020.35136.2577
The present paper reports the numerical results of fluid flow in porous phase change materials (PCM) media. This is an important topic in potential scientific, technological and engineering field’s especially latent heat storage. In this paper, we are only interested in the correlation between permeability and porosity of the porous media and not in latent storage. Fluid flow is characterized by many parameters mainly permeability and porosity. Many models have been proposed for the study of this phenomenon over the years. However, it can be modeled using the complex model that studies the characteristics of pore microstructure and fluid flow in porous media. This model is more accurate and realistic compared to previous models. It predicts permeability and porosity with a good agreement with experimental data. In this paper, the complex model is used to determine the impact of the tortuosity and the density of capillary distribution on the relation between permeability and porosity and check their scaling laws with universal exponents independently of other parameters. The results show that the permeability-porosity relation is proportional to the standard deviation of capillary distribution and its density. The tortuosity affects porosity proportionally, and permeability inversely. The relation between porosity and permeability follows a power law with universal exponents β = 4.06 ± 0.12 for different values of the expectation of distribution, the density of capillaries and the tortuosity; and β = 1.69 ± 0.01 for different values of the standard deviation, density of capillaries and tortuosity. The universality of these exponents further validates the complex model with various previous experimental and numerical studies.
Scaling law,Permeability,Porosity,Porous media,Complex model,Fluid flow
https://jacm.scu.ac.ir/article_16043.html
https://jacm.scu.ac.ir/article_16043_14994562852cc5c0bb57315a3874bcca.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Performance of Two Types of High Speed, High Efficiency Axisymmetric Intakes
93
101
EN
Vladislav
Galkin
0000-0002-5359-6253
School of Earth Sciences & Engineering, Tomsk Polytechnic University, 634050, Tomsk, Russia
vlg@tpu.ru
Vasily
Fomin
0000-0002-2811-0143
Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russia
fomin@itam.nsc.ru
Sannu
Mölder
0000-0001-9366-7418
Ryerson University, ON M5B 2K3, Toronto, Canada
smolder@sympatico.ca
Dmitry
Vnuchkov
0000-0002-8194-5780
Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russia
vnuchkov@itam.nsc.ru
Valery
Zvegintsev
0000-0002-4942-9778
Khristianovich Institute of Theoretical and Applied Mechanics of the Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Russia
zvegin@itam.nsc.ru
10.22055/jacm.2020.35250.2609
Performance of two axisymmetric air intakes are compared at conditions suitable for Mach number range from 2 to 8. First is the Busemann intake and second is the reversed isentropic nozzle. The isentropic nozzle is built by the method of characteristics. The contour of this nozzle is taken as a compression surface for the incoming flow. Performances of these two intakes are compared by comparison of both viscous and inviscid CFD calculations at Mach 6. Viscous flow calculations show that the total pressure recovery in compression section is 0.8316 in the Busemann intake and 0.869 in the reversed isentropic nozzle intake.
supersonic,air intake,near-isentropic compression,Total pressure recovery
https://jacm.scu.ac.ir/article_16010.html
https://jacm.scu.ac.ir/article_16010_e47082683ab0ea897194cf3387d6f332.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Exp-function Method and Reduction Transformations for Rogue Wave Solutions of the Davey-Stewartson Equations
102
108
EN
Sheng
Zhang
orcid.org/0000-0002-4631-7033
School of Mathematical Sciences, Bohai University, Jinzhou, 121013, China
szhangchina@126.com
Yue
Zhang
0000-0002-4546-6782
School of Mathematical Sciences, Bohai University, Jinzhou, 121013, China
2891233430@qq.com
Bo
Xu
0000-0002-7956-4882
School of Mathematics, China University of Mining and Technology, Xuzhou, 221116, China
bxu@bhu.edu.cn
10.22055/jacm.2020.34855.2484
A pair of rogue wave solutions of the Davey-Stewartson (DS) equations are obtained by using the exp-function method and reduction transformations. Firstly, the Davey-Stewartson equations are transformed into two easy-to-solve equations, one of which is the deformed nonlinear Schrödinger (NLS) equation and the other is a polynomial equation. Secondly, based on the existing known solutions of the deformed NLS equation constructed by the exp-function method, rogue wave solutions of the DS equations are obtained. Finally, some spatial and spatiotemporal structures and dynamical evolutionary plots of the obtained rogue wave solutions are shown.
Rouge wave solution,Davey-Stewartson equations,Spatial structure,Spatiotemporal structure,Dynamical evolution
https://jacm.scu.ac.ir/article_15881.html
https://jacm.scu.ac.ir/article_15881_a2f4293a9c0fa6b4d7415cab60c28fec.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Forced Vibration Responses of Axially Functionally Graded Beams by using Ritz Method
109
115
EN
Şeref Doğuşcan
Akbaş
0000-0001-5327-3406
Bursa Technical University, Department of Civil Engineering, Yıldırım Campus, 16330, Yıldırım/Bursa, Turkey
serefda@yahoo.com
10.22055/jacm.2020.34865.2491
This work presents forced vibration responses of a cantilever beam made of functionally graded material under a harmonic load. The material properties of beam vary along the axial direction. The kinematics of the beam are considered within Timoshenko beam theory. The governing equations of problem are derived by using the Lagrange procedure. In the solution of the problem the Ritz method is used and algebraic polynomials are used with the trivial functions for the Ritz method. In the solution of the forced vibration problem, the Newmark average acceleration method is used in the time history. In this study, free and forced vibration responses of the axially functionally graded beam are investigated in detail. In the numerical examples, the effects of material graduation, geometric and dynamic parameters on the free and forced vibration response of axially graded beam are investigated.
Axially Functionally Graded Material,Forced Vibration Analysis,Timoshenko Beams,Ritz method
https://jacm.scu.ac.ir/article_15883.html
https://jacm.scu.ac.ir/article_15883_33359952593ce5446e2c3dc659a1ec6b.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
MHD Oldroyd-B Fluid with Slip Condition in view of Local and Nonlocal Kernels
116
127
EN
Muhammad Bilal
Riaz
0000-0001-5153-297X
Department of Mathematics, University of Management and Technology, Lahore, 54000, Pakistan
bilalsehole@gmail.com
Imran
Siddique
0000-0002-5060-7906
Department of Mathematics, University of Management and Technology, Lahore, 54000, Pakistan
imransmsrazi@gmail.com
Syed Tauseef
Saeed
0000-0002-0971-8364
Department of Science & Humanities, National University of Computer and Emerging Sciences, Lahore Campus, 54000, Pakistan
tauseefsaeed301@gmail.com
Abdon
Atangana
0000-0002-1886-3125
Institute for Groundwater Studies (IGS), University of the Free State, Bloemfontein, 9301, South Africa
atanganaa@ufs.ac.za
10.22055/jacm.2020.34919.2511
We examine the velocity field of an incompressible Oldroyd-B fluid over a horizontal plate of continual length in a permeable medium with magnetohydrodynamics effect. Firstly, the results for the dimensionless classical model (governing equation) have been studied analytically then the study is extended for different fractional operators. The relations to determine the velocity fields of this problem are found by Laplace transformation and different numerical inversion algorithms. The impact of physical parameters on velocity profiles is analyzed graphically for integer and non-integer models. Non-integer operators are used to analyzing the impact of fractional parameters on the fluid curves of the fluid.
Fractional Operators,Magnetic field,Oldroyd-B fluid,Velocity field,Local and non-local kernels
https://jacm.scu.ac.ir/article_15884.html
https://jacm.scu.ac.ir/article_15884_4301fe5b10d50c6a096be09433bf6d37.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Symmetry Reduction and Exact Solutions of a Class of Wave Equations
128
134
EN
Yi
Tian
https://orcid.org/0000-0001-7669-2822
College of Data Science and Application, Inner Mongolia University of Technology, Hohhot, 010080, China
ttxsun@163.com
10.22055/jacm.2020.34861.2488
In this paper, the Lie symmetries and similarity reduction of a class of wave equations are investigated. First, Lie algorithm is used to get the determining equations of symmetry for the given equations which are complicated and difficult to be solved. Next, differential form of Wu’s method is used to solve this problem. Moreover, a special case of differential invariant method is used to get similarity reduction of the given equations.
Lie algorithm,Similarity reduction,Differential form Wu’s method
https://jacm.scu.ac.ir/article_15879.html
https://jacm.scu.ac.ir/article_15879_4d38eab3795f787e065fcb4d8be787e2.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Forced Response of a Low-Pressure Turbine Blade using Spectral/hp Element Method: Direct Numerical Simulation
135
147
EN
Daniel H.
Wacks
0000-0002-3985-9344
Department of Mechanical & Construction Engineering, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
daniel.wacks@northumbria.ac.uk
Mahdi E.
Nakhchi
0000-0003-1034-6091
Department of Mechanical & Construction Engineering, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
mahdi.nakhchi@northumbria.ac.uk
Mohammad
Rahmati
0000-0003-4903-5370
Department of Mechanical & Construction Engineering, Northumbria University, Newcastle upon Tyne, NE1 8ST, UK
mohammad.rahmati@northumbria.ac.uk
10.22055/jacm.2020.34843.2480
The Spectral/HP element method has been applied to perform Direct Numerical Simulations (DNS) over a single T106A turbine blade-row using the open source software Nektar++. The main goal of the current study is to perform preliminary investigations at modest Reynolds and Mach numbers, 8000 and 0.1 respectively, for uniform, steady flow past the aerofoil by employing Nektar++’s solver for the 2D Navier-Stokes equations for incompressible flow. The mesh was firstly validated against results obtained using the same software and for a similar set of parameter values. One dimensional, pitch-wise harmonic vibrations were subsequently imposed on the blade by means of a coordinate transformation. A parametric study in terms of the frequency and amplitude of the vibrations was carried out. The effects of the vibrations on entire domain, along the blade surface and in its wake were assessed. The pressure on the blade surface and the wake loss were each decomposed into components arising due to the mean flow and due to the vibrations. In each case the dominant components were then identified for the values of frequency and amplitude considered here.
DNS,Spectral/hp element method,Low-pressure turbine,Blade vibrations
https://jacm.scu.ac.ir/article_15891.html
https://jacm.scu.ac.ir/article_15891_36778cd81b4e58cb0ba850aa9c125bbd.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Nonlinear Winkler-based Frame Element with Inclusion of Shear-Flexure Interaction Effect for Analysis of Non-Ductile RC Members on Foundation
148
164
EN
Worathep
Sae-Long
0000-0001-8149-4409
Civil Engineering Program, School of Engineering, University of Phayao, Phayao, 56000, Thailand
worathep.sa@up.ac.th
Suchart
Limkatanyu
0000-0002-4343-7654
Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand
suchart.l@psu.ac.th
Pattamad
Panedpojaman
Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand
ppattamad@eng.psu.ac.th
Woraphot
Prachasaree
0000-0002-0447-4997
Department of Civil Engineering, Faculty of Engineering, Prince of Songkla University, Songkhla, 90112, Thailand
woraphot.p@psu.ac.th
Nattapong
Damrongwiriyanupap
0000-0001-7280-5957
Civil Engineering Program, School of Engineering, University of Phayao, Phayao, 56000, Thailand
nattapong.da@up.ac.th
MInho
Kwon
0000-0003-0754-285X
Department of Civil Engineering, ERI, Gyeongsang National University, Jinju, 660-701, South Korea
kwonm@gnu.ac.kr
Chayanon
Hansapinyo
0000-0002-6237-613X
Center of Excellence in Natural Disaster Management, Department of Civil Engineering, Chiang Mai University, Chiang Mai, 50200, Thailand
chayanon@eng.cmu.ac.th
10.22055/jacm.2020.34699.2460
Non-ductile reinforced concrete (RC) members are common in the existing RC frame buildings with the old seismic code (lightly and inadequately detailed transverse reinforcement) and may suffer shear failure or flexure-shear failure. To investigate the failure behaviors of those RC structures, performance-based numerical models are needed. Thus, a new fiber frame element on Winkler-based foundation including the interaction effects between shear and flexure was developed to analyze non-ductile RC frames resting on foundation, in this study. The proposed element is formulated for implementation in displacement-based finite element formulation under the kinematic assumptions of Timoshenko beam theory. As a result, axial and flexural mechanisms are automatically coupled through the fiber-section model, while shear and flexural actions interact via the UCSD shear-strength model within the framework of modified Mergos-Kappos interaction procedure to evaluate sectional shear force and shear stiffness within the shear constitutive law. Therefore, the presented model is simple, but able to capture several salient behaviors of non-ductile RC frames resting on foundation, including interaction between shear and flexure, soil-structure interaction, degradation of shear strength due to inelastic flexural deformation, and shear failure. Those features and efficiency of the proposed model are demonstrated by two numerical simulations in this work.
RC frame element,Soil-structure interaction,Shear-flexure interaction,Winkler foundation,Flexure-shear critical column
https://jacm.scu.ac.ir/article_15890.html
https://jacm.scu.ac.ir/article_15890_d387cbb6df88b351604105b3e6a30f87.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Control of Actuators Torques for Optimal Movement along a Given Trajectory for the DexTAR Robot
165
176
EN
Balgaisha
Mukanova
0000-0002-0823-6451
Institute of Information and Computational Technologies, 125, Pushkin str., Almaty, 050000, Kazakhstan
mbsha01@gmail.com
10.22055/jacm.2020.34650.2449
The control problem of the dynamics of actuators is considered to obtain a given optimal movement of the end-effector for a parallel Dexterous Twin Arms Robot (DexTAR). The trajectory is assumed to be known in advance, and the law of motion along the trajectory is given from some optimality conditions. The equations of dynamics of the robot are written under the condition that the leading rods are driven by torques of a symmetrically arranged pair of engines. The solutions of the direct and inverse kinematic problems are presented as auxiliary material. The resulting nonlinear motion equations are derived. A numerical example shows that the equations can be simplified neglecting the change in the angle between the rods at the end-effector. Numerical examples of calculating the torques are given.
Robot dynamics,Dynamics inverse problem,Optimal motion,Robot control,Parallel robot
https://jacm.scu.ac.ir/article_15892.html
https://jacm.scu.ac.ir/article_15892_1c36aedaf71b366bf0c8413c2290387e.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
A Simple Approach for the Fractal Riccati Differential Equation
177
181
EN
Kang-Jia
Wang
0000-0002-3905-0844
School of Physics and Electronic Information Engineering, Henan Polytechnic University, Jiaozuo, 454003, China
konka05@163.com
10.22055/jacm.2020.34857.2486
<span>In this paper, a fractal modification of the Riccati differential equation is presented, and the two-scale transform method combined with Taylor series is used to solve the equation. Two examples are given to verify the correctness and effectiveness of the proposed method.</span>
Two-scale transform method,Taylor series method,Fractal Riccati differential equation.
https://jacm.scu.ac.ir/article_15895.html
https://jacm.scu.ac.ir/article_15895_e649584dfce129b89603b8528a75fc0f.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Fractal Variational Theory for Chaplygin-He Gas in a Microgravity Condition
182
188
EN
KangLe
Wang
0000-0002-6637-5687
School of Mathematic and Information Science, Henan Polytechnic University, Jiaozuo, Henan 454000, P. R. China
kangle140917@163.com
ShaoWen
Yao
0000-0002-0273-4505
School of Mathematic and Information Science, Henan Polytechnic University, Jiaozuo, Henan 454000, P. R. China
ysw140917@163.com
10.22055/jacm.2020.34895.2500
On the microgravity condition, gravity affects the motion of objects and the flow of fluids, and the continuum assumption is not valid, therefore, a fractal Chaplygin-He gas model is developed by a new fractal derivative in microgravity space. A fractal variational principle is successfully established via the fractal semi-inverse method.
fractal derivative,Chaplygin-He gas model,Microgravity space,Fractal variational theory,Fractal semi-inverse method
https://jacm.scu.ac.ir/article_15896.html
https://jacm.scu.ac.ir/article_15896_d4681fb86d7addedd18104d24e4d9503.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Heat and Mass Transfer of Natural Convective Flow with Slanted Magnetic Field via Fractional Operators
189
212
EN
Nazish
Iftikhar
0000-0003-1840-2262
Department of Science & Humanities, National University of Computer and Emerging Sciences, Lahore Campus, 54000, Pakistan
nazish.iftikhar289@gmail.com
Dumitru
Baleanu
0000-0002-0286-7244
Department of Mathematics, Cankaya University, Ankara, 06790, Turkey
dumitru@cankaya.edu.tr
Muhammad Bilal
Riaz
0000-0001-5153-297X
Department of Mathematics, University of Management and Technology, Lahore, 54000, Pakistan
bilalsehole@gmail.com
Syed Muhammad
Husnine
0000-0002-3237-6681
Department of Science & Humanities, National University of Computer and Emerging Sciences, Lahore Campus, 54000, Pakistan
syed.husnine@nu.edu.pk
10.22055/jacm.2020.34930.2514
This article explores the MHD natural convective viscous and incompressible fluid flow along with radiation and chemical reaction. The flow is confined to a moving tilted plate under slanted magnetic field with variable temperature in a porous medium. Non-dimensional parameter along Laplace transformation and inversion algorithm are used to investigate the solution of system of dimensionless governing equations. Fractional differential operators namely, Caputo (C), Caputo-Fabrizio (CF) and Atangana-Baleanu in Caputo sense (ABC) are used to compare graphical behavior of for velocity, temperature and concentration for emerging parameters. On comparison, it is observed that fractional order model is better in explaining the memory effect as compared to classical model. Velocity showing increasing behavior for fractional parameter a whereas there is a decline in temperature, and concentration profiles for a. Fluid velocity goes through a decay due to rise in the values of <em>M</em>, <em>Sc</em> and j. However, velocity shows a reverse profile for augmented inputs of <em>K<sub>p </sub></em>, <em>G<sub>r</sub></em> and <em>S</em>. Tabular comparison is made for velocity and Nusselt number and Sherwood number for fractional models.
Fractional order derivatives,Inclined magnetic field,Laplace transformation,Inversion algorithm
https://jacm.scu.ac.ir/article_15904.html
https://jacm.scu.ac.ir/article_15904_be97c38d2b49c36816b692eb8c2a35d0.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
New Analytical Study for Nanofluid between Two Non-Parallel Plane Walls (Jeffery-Hamel Flow)
213
224
EN
Abeer
Majeed Jasim
0000-0001-6713-5696
Department of Mathematics, College of Science, University of Basrah, Basrah, Iraq
abeer.jassem@yahoo.com
10.22055/jacm.2020.34958.2520
The aim of this paper is to analyze the problem of magneto hydrodynamic Jeffrey-Hamel flow (JHF) with nanoparticles. The governing equations for this problem are reduced to an ordinary differential equation and it is solved using new analytical method (NAM) and fourth-order Runge-Kutta Method (RK ∼ 4). The NAM is an iterative method that relies mainly on derivatives with Taylor expansion interference. In addition, the velocity profile has been computed and shown for various values of physical parameters. The objective of the present work is to investigate the effect of the angles between the plates, Reynold number, magnetic number and nanoparticles volume fraction on the velocity profile.
Magneto hydrodynamic flow,Jeffrey-Hamel flow,Nanoparticle,Non-linear Ordinary Differential Equation,Analytical solution
https://jacm.scu.ac.ir/article_15893.html
https://jacm.scu.ac.ir/article_15893_9eb07146f8cd53541712ca7e791c8abc.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
An Efficient Spectral Method-based Algorithm for Solving a High-dimensional Chaotic Lorenz System
225
234
EN
Phumlani
Dlamini
0000-0001-9261-308X
Department of Mathematics and Applied Mathematics, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa
phgdlamini@gmail.com
Simphiwe
Simelane
0000-0002-0067-2996
Department of Mathematics and Applied Mathematics, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa
simphinho@gmail.com
10.22055/jacm.2020.34364.2393
In this paper, we implement the multidomain spectral relaxation method to numerically study high dimensional chaos by considering the nine-dimensional Lorenz system. Chaotic systems are characterized by rapidly changing solutions, as well as sensitivity to small changes in initial data. Most of the existing numerical methods converge slowly for this kind of problems and this results in inaccurate approximations. Spectral methods are known for their high accuracy. However, they become less accurate for problems characterised by chaotic solutions, even with an increase in the number of grid points. As a result, in this work, we adopt the multidomain approach which assumes that the main interval can be decomposed into a finite number of subdomains and the solution obtained in each of the subdomains. This approach remarkably improves the results as well as the efficiency of the method.
spectral method,multidomain,Chaotic systems
https://jacm.scu.ac.ir/article_15911.html
https://jacm.scu.ac.ir/article_15911_279d2b2d45b9809ab43603e15e340afa.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Accelerating the Convergence of Multiphase Flow Simulations when Employing Non-Uniform Structured Grids
235
253
EN
Gautham
Krishnamoorthy
0000-0002-5520-5092
Department of Chemical Engineering, UPSON II Room 365, 241 Centennial Drive, University of North Dakota, Grand Forks, ND 58202-7101, USA
gautham.krishnamoorthy@und.edu
Lauren Elizabeth
Clarke
0000-0003-4780-2791
Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room 66-350, Cambridge, Massachusetts 02139, USA
lclarke@mit.edu
Jeremy Nicholas
Thornock
0000-0002-6587-9437
Department of Chemical Engineering, 50 S. Central Campus Dr., Room 3290 MEB, University of Utah, Salt Lake City, UT 84112-9203, USA
j.thornock@utah.edu
10.22055/jacm.2020.35096.2563
Non-uniform grids inevitably arise in multiphase flow simulation scenarios due to the need to resolve near-wall phenomena and/or large L/D ratios associated with the reactor configuration. This in conjunction with large density ratios of the constituent phases can retard the convergence of the pressure-correction equation that results from applying operator-splitting methods to the incompressible Navier-Stokes equations. Various pre-conditioning strategies to this ill-conditioned pressure-correction matrix are explored in this study for a class of bubbling bed simulations encompassing: different particle densities, bed-heights and dimensions (2D/3D). The right-side Block Jacobi preconditioning option resulted in a 20 - 35% decrease in CPU time that correlated well with a decrease in the number of iterations to reach a specified tolerance.
PETSc,MFiX,BiCGSTAB,Preconditioner,Multiphase flow
https://jacm.scu.ac.ir/article_16046.html
https://jacm.scu.ac.ir/article_16046_c96e19f7a8ce9e6402e1b86ca9fff03f.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
On the Usefulness of Pre-processing Methods in Rotating Machines Faults Classification using Artificial Neural Network
254
261
EN
Ahmad
Alzghoul
0000-0002-5716-6832
Data Science Department, Princess Sumaya University for Technology, Amman, Jordan
a.alzghoul@psut.edu.jo
Anwar
Jarndal
0000-0002-1873-2088
Electrical Engineering Department, University of Sharjah, Sharjah, United Arab Emirates
ajarndal@sharjah.ac.ae
Imad
Alsyouf
0000-0002-6200-8919
Sustainable Engineering Asset Management (SEAM) Research Group, University of Sharjah, Sharjah, United Arab Emirates
ialsyouf@sharjah.ac.ae
Ahmed Ameen
Bingamil
0000-0002-9017-0075
Sustainable Engineering Asset Management (SEAM) Research Group, University of Sharjah, Sharjah, United Arab Emirates
abingamil@sharjah.ac.ae
Muhammad Awais
Ali
0000-0001-9742-2653
Sustainable Engineering Asset Management (SEAM) Research Group, University of Sharjah, Sharjah, United Arab Emirates
m.awaisali.mirza@gmail.com
Saleh
AlBaiti
0000-0002-2335-5096
Sustainable Engineering Asset Management (SEAM) Research Group, University of Sharjah, Sharjah, United Arab Emirates
salbaiti@sharjah.ac.ae
10.22055/jacm.2020.35354.2639
This work presents a multi-fault classification system using artificial neural network (ANN) to distinguish between different faults in rotating machines automatically. Rotation frequency and statistical features, including mean, entropy, and kurtosis were considered in the proposed model. The effectiveness of this model lies in using Synthetic Minority Over-sampling Technique (SMOTE) to overcome the problem of imbalance data classes. Furthermore, the Relief feature selection method was used to find the most influencing features and thus improve the performance of the model. Machinery Fault Database (MAFAULDA) was deployed to evaluate the performance of the prediction models, achieving an accuracy of 97.1% which surpasses other literature that used the same database. Results indicate that handling imbalance classes hold a key role in increasing the overall accuracy and generalizability of multi-layer perceptron (MLP) classifier. Furthermore, results showed that considering only statistical features and rotational speed are good enough to get a model with high classification accuracy.
Rotating machines,Multi-fault diagnostic,Data Pre-processing,Handling Imbalance Dataset,machine learning
https://jacm.scu.ac.ir/article_16049.html
https://jacm.scu.ac.ir/article_16049_983a7efcea486af4010045db59a7a3c6.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Application of Complex Functional of Quality in Optimal Control of Spacecraft Motion
262
269
EN
Mikhail Valer’evich
Levskii
Research Institute of Space Systems, Khrunichev State Space Research-and-production Center, Korolev, Russia
levskii1966@mail.ru
10.22055/jacm.2020.35161.2585
The problem of optimal control of the reorientation of a spacecraft as a solid body from an arbitrary initial position into a prescribed final angular position is considered and solved. The case is studied in detail when the minimized index combines, in a given proportion, the integral of modulus of angular momentum and duration of maneuver. It is proved that the accepted optimality criterion guarantees the motion of a spacecraft with modulus of angular momentum not exceeding the required value. Formalized equations and expressions for the synthesis of the optimal rotation program are obtained using quaternion models. It is shown that the optimal solution corresponds to the strategy “acceleration - rotation with constant modulus of angular momentum-braking”, the angular momentum and the controling moment are perpendicular during optimal rotation between acceleration and braking. On the basis of necessary optimality conditions, the main properties, laws, and key characteristics (parameters, constants, integrals of motion) of the optimal solution of the control problem, including the turn time and the maximum angular momentum for the optimal motion, are determined. An estimation of the influence of the bounded controling moment on the character of the optimal motion and on the indicators of quality is made. The construction of an optimal control program of rotation is based on the quaternion variables and Pontryagin’s maximum principle. The value of maximal angular momentum magnitude is calculated by condition of transversality. The designed method is universal and invariant relative to the moments of inertia. For dynamically symmetric spacecraft, a complete solution of the reorientation problem in closed form is presented. An example and results of mathematical modeling of the motion of a spacecraft under optimal control are presented, demonstrating the practical feasibility of the method for controlling spacecraft's spatial orientation.
spacecraft attitude,Quaternion,optimal control,criterion of quality,maximum principle,Transfersality conditions
https://jacm.scu.ac.ir/article_15974.html
https://jacm.scu.ac.ir/article_15974_09e54e4fdfed9aff81b4872c7cce80b7.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Dynamic Investigation of Non-linear Behavior of Hydraulic Cylinder in Mold Oscillator using PID Control Process
270
276
EN
Yonghui
Park
0000-0001-6716-6935
Department of Mechanical Engineering, Yuhan University, 590, Gyeongin-ro, Bucheon-si, Gyeonggi-do, Republic of Korea
yhpark@yuhan.ac.kr
Changwoo
Lee
Steel-pipe Technology Team, Pohang Institute of Metal Industry Advancement, 56, Jigok-ro, Nam-gu, Pohang-si, Gyeongsangbuk-do, Republic of Korea
cw82lee@pomia.or.kr
10.22055/jacm.2020.32923.2102
To learn the dynamic characteristics of a mold oscillator, we establish a model that describes the relationship between force equilibrium of a hydraulic cylinder and mold under various oscillation conditions. The non-linearity caused by the servo-value and the operating fluid is considered as excitation, and is calculated as control error between an input signal and mold oscillation in real-time by a PID control process. Based on the non-linear property, we determine that the dynamic behavior is caused by mold oscillation displacement and hydraulic cylinder pressure. We define excitation frequency and harmonic terms, and determine that the sources of the harmonic peak frequency and high peak frequency; (50n ± exciting frequency <em>ω<sub>exc</sub></em>) are friction between the piston and hydraulic cylinder, and variable stiffness of the operating fluid. Finally, a mathematical model of the hydraulic chamber that can represent the unknown non-linear phenomenon is derived.
Dynamics,mold oscillator,hydraulic cylinder,beat phenomenon
https://jacm.scu.ac.ir/article_15483.html
https://jacm.scu.ac.ir/article_15483_a91cd1b16a50ff1f6c86bdda2d08774f.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Thermoelastic Model with Higher-order Time-derivatives and Two Phase-lags for an Infinitely Long Cylinder under Initial Stress and Heat Source
277
291
EN
Anouar
Saidi
https://orcid.org/0000-0002-1147-5488
Department of Mathematics, College of Science and Arts of Gurayyat, Jouf University, Gurayyat, Saudi Arabia
saidi.anouar@yahoo.fr
Ahmed E.
Abouelregal
0000-0003-3363-7924
Department of Mathematics, College of Science and Arts of Gurayyat, Jouf University, Gurayyat, Saudi Arabia
ahabogal@gmail.com
10.22055/jacm.2020.31836.1924
In this work, a generalized higher-order time-derivatives model with phase-lags has been introduced. This model is applied to study the thermal heat problem of a homogeneous and isotropic long cylinder due to initial stress and heat source. We use the Laplace transform method to solve the problem. The numerical solutions for the field functions are obtained numerically using the numerical Laplace inversion technique. The effect of the higher-order parameters, the initial stress, the magnitude of the heat source and the instant time on the temperature field, the displacement field, and the stress fields have been calculated and displayed graphically and the obtained results are discussed. The results are compared with those obtained previously in the contexts of some other models of thermoelasticity.
Generalized thermoelasticity,Phase-lags,Higher-order,Initial Stress
https://jacm.scu.ac.ir/article_15353.html
https://jacm.scu.ac.ir/article_15353_780f1ee632468bbccc6dc2a1425b139e.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Numerical Modeling of Heat Transfer and Hydrodynamics in Compact Shifted Arrangement Small Diameter Tube Bundles
292
301
EN
Valery
Gorobets
000-0003-1180-4509
Department of Heat and Power Engineering, National University of Life and Environmental Sciences of Ukraine, Heroyiv Oborony st., 15, Kyiv, 03041, Ukraine
gorobetsv@ukr.net
Viktor
Trokhaniak
0000-0002-8084-1568
Department of Heat and Power Engineering, National University of Life and Environmental Sciences of Ukraine, Heroyiv Oborony st., 15, Kyiv, 03041, Ukraine
trohaniak.v@gmail.com
Yurii
Bohdan
000- 0002-3178-1941
Department of Vessel’s Power Plants Operation, Kherson State Maritime Academy, Ushakova avenue, 20, Kherson, 73000, Ukraine
bohdanyurii09@gmail.com
Ievgen
Antypov
000- 0003-0509-4109
Department of Heat and Power Engineering, National University of Life and Environmental Sciences of Ukraine, Heroyiv Oborony st., 15, Kyiv, 03041, Ukraine
ievgeniy_antypov@ukr.net
10.22055/jacm.2020.31007.1855
Numerical modeling of heat and hydrodynamics processes in the channels of compact small diameter tube bundles with different transverse shifted arrangement is carried out. The fields of velocities, temperatures, and pressures in the tube bundle channels were obtained, and their influence on heat transfer conditions and hydraulic losses were analyzed. The calculation of the thermohydraulic efficiency for different constructions of the tube bundles had been carried out, and their results with data of well-known tube bundles of different geometry are compared.
Heat exchanger,tube bundle,thermohydraulic efficiency,Numerical modeling,hydraulic losses
https://jacm.scu.ac.ir/article_15391.html
https://jacm.scu.ac.ir/article_15391_89fecffab11a6adab8922851ef966548.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Fractional Sumudu Decomposition Method for Solving PDEs of Fractional Order
302
311
EN
Hassan Kamil
Jassim
0000-0001-5715-7752
Department of Mathematics, Faculty of Education for Pure Sciences, University of Thi-Qar
Nasiriyah, Iraq
hassan.kamil@yahoo.com
Habeeb
Kadmim
0000-0001-5692-2993
Department of Mathematics, Faculty of Computer Science and Mathematics , University of Thi-Qar, Nasiriyah, Iraq
habeebk2017@gmail.com
10.22055/jacm.2020.31776.1920
. In this paper, the fractional Sumudu decomposition method (FSDM) is employed to handle the time-fractional PDEs and system of time-fractional PDEs. The fractional derivative is described in the Caputo sense. The approximate solutions are obtained by using FSDM, which is the coupling method of fractional decomposition method and Sumudu transform. The method, in general, is easy to implement and yields good results. Illustrative examples are included to demonstrate the validity and applicability of the proposed technique.
Fokker Plank equation,Nonlinear gas dynamic equation,Sumudu transform,Adomian decomposition method
https://jacm.scu.ac.ir/article_15348.html
https://jacm.scu.ac.ir/article_15348_8f04720caccc94a0f7cc7cd625fe81ad.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Numerical Analysis of the Baffles Inclination on Fluid Behavior in a Shell and Tube Heat Exchanger
312
320
EN
Ahmed
Youcef
0000-0003-3268-4585
Research Unit for Renewable Energies in the Saharan Region (URERMS), Renewable Energy Development Center (CDER), 01000, Adrar, Algeria
a_youcef83@yahoo.fr
Rachid
Saim
0000-0002-7509-6612
Energetic and Applied Thermal Laboratory (E.T.A.P), Faculty of Technology, Abou Bekr Belkaid University, P. Box 230, Tlemcen, Algeria
saimrachid@yahoo.fr
10.22055/jacm.2020.32925.2103
The thermo-hydraulic performances of the shell-and-tube heat exchangers with different baffles inclination angle α =10°, α =20°, and α = 40° are investigated. The numerical analysis has been evaluated using ANSYS Fluent with the finite volume method for Reynolds number varying between 24000 and 27000. In all heat exchangers, the characteristics studied are the velocity, the temperature in the shell, the heat transfer coefficient, the pressure. The results showed small dead zones for the baffles inclination angle of 40°. The results showed that the temperature increases by 3.4 K, the heat transfer coefficient decreased by 0.983 %, the pressure drop decreased by 0.992 %, the overall performance factor decreased by 0.83 % when the baffles inclination angle α is increased from 10° to 40°.
Shell and tube heat exchanger,CFD,pressure drop,Baffle design
https://jacm.scu.ac.ir/article_15669.html
https://jacm.scu.ac.ir/article_15669_85b1f6132b4f2d71a36f66808600748d.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Applications of Higher-Order Derivatives to the Subclasses of Meromorphic Starlike Functions
321
333
EN
Bilal
Khan
0000-0003-2427-2003
School of Mathematical Sciences, East China Normal University, 500 Dongchuan Road, Shanghai 200241, People’s Republic of China
bilalmaths789@gmail.com
Hari Mohan
Srivastava
0000-0002-9277-8092
Department of Mathematics and Statistics, University of Victoria, Victoria, British Columbia V8W 3R4, Canada
harimsri@math.uvic.ca
Nazar
Khan
0000-0003-1123-8578
Department of Mathematics, Abbottabad University of Science and Technology, Abbottabad 22010, Pakistan
nazarmaths@gmail.com
Maslina
Darus
0000-0001-9138-916X
Department of Mathematical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
maslina@ukm.edu.my
Muhammad
Tahir
0000-0002-8174-8795
Department of Mathematics, Abbottabad University of Science and Technology, Abbottabad 22010, Pakistan
tahirmuhammad778@gmail.com
Abdul
Samad
0000-0002-0887-9860
School of mathematics Northwest University Xi'an 710127 P. R. China
abdulsamad@stumail.nwu.edu.cn
10.22055/jacm.2020.34948.2518
In this paper, we introduce and study some new classes of multivalent (<em>p </em>-valent) meromorphically starlike functions involving Higher-Order derivatives. For these multivalent classes of functions, we derive several interesting properties including sharp coefficient bounds, neighborhoods, partial sums and inclusion relationships. For validity of our results relevant connections with those in earlier works are also pointed out.
Meromoprhic functions,Meromorphically starlike functions,Functions with positive real parts,Higher-order derivatives
https://jacm.scu.ac.ir/article_15932.html
https://jacm.scu.ac.ir/article_15932_6e99fc95857b9d6f231292fe6c3ce67e.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Constructal Design of an Idealize Arterial Bypass Graft: Effect of the Bypass Attachment Pointon Resistance to Flow
334
344
EN
Andrea Natale
Impiombato
0000-0003-1103-8058
Department of Industrial Engineering (DIN), School of Engineering and Architecture, Alma Mater Studiorum – University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
andrea.impiombato2@unibo.it
Flavia Schwarz
Franceschini
Zinani
0000-0001-5402-900X
Mechanical Engineering Graduate Program, Universidade do Vale do Rio dos Sinos, 93022-750 Såo Leopoldo, Brazil
fzinani@unisinos.br
Luiz
Alberto Oliveira
Rocha
0000-0003-2409-3152
Mechanical Engineering Graduate Program, Universidade do Vale do Rio dos Sinos, 93022-750 Såo Leopoldo, Brazil
luizor@unisinos.br
Cesare
Biserni
0000-0003-0081-2036
Department of Industrial Engineering (DIN), School of Engineering and Architecture, Alma Mater Studiorum – University of Bologna, Viale Risorgimento 2, 40136 Bologna, Italy
cesare.biserni@unibo.it
10.22055/jacm.2020.35246.2607
This paper aims to investigate, through the 3D numerical analysis of an idealized arterial bypass graft, the dependence of the resistance to flow on the bypass insertion point. The computational model assumes a laminar steady-state Newtonian fluid flow and three different Reynolds numbers: 150, 250, and 400. In this study, the constructal theory has been employed, a self-standing law in physics which covers the statement of minimum flow resistance to optimize morphing architectures, i.e. the coronary artery bypass grafting. According to the Constructal Design method, the constraints are stenosis degree, junction angle, and diameter ratio, while the attachment point is defined as a design parameter. The results demonstrate that the distance between the bypass attachment point and the stenosis influences the pressure drop; more specifically, the pressure drop decreases with the augmentation of the distance. In this regard, a different distribution of the mass flows between the bypass, and the artery is observed and seemed to be the main reason for that behavior. The application of the Constructal Design method in hemodynamics is a tool to describe the biological system to search for better flow performance since it is based on the natural evolution of living systems.
Constructal Design,Blood flow,Coronary artery,Bypass graft,Dimensionless pressure drop
https://jacm.scu.ac.ir/article_16031.html
https://jacm.scu.ac.ir/article_16031_0f8ff0fd05a5c19cdf71b802b30686d7.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Buckling Analysis of Functionally Graded Shells under Mixed Boundary Conditions Subjected to Uniform Lateral Pressure
345
354
EN
Abdullah H.
Sofiyev
0000-0001-7678-6351
Department of Civil Engineering of Engineering Faculty, Suleyman Demirel University, 32260, Isparta, Turkey
abdullahavey@sdu.edu.tr
Fatih
Dikmen
0000-0001-8136-046X
Student of Graduate School of Natural and Applied Sciences of Suleyman Demirel University, 32260, Isparta, Turkey
fatih.dikmen@gmail.com
10.22055/jacm.2020.35564.2684
In this study, the buckling problem of shells consisting of functionally graded materials (FGMs) under uniform compressive lateral pressure is solved at mixed boundary conditions. After creating the FGM models, the basic differential equations of FGM shells under compressive lateral pressure are derived within the scope of classical shell theory (CST). The basic differential equations are solved with the help of Galerkin method and the formula for the lateral buckling pressure is obtained. The minimum values of the lateral buckling pressure are found numerically by minimizing the obtained expression according to the numbers of transverse and longitudinal waves. The accuracy is confirmed by comparing the numerical values for the lateral buckling pressure of homogeneous and FGM shells with the results in the literature. The influences of FGM profiles and shell characteristics on the magnitudes of lateral buckling pressure are investigated in detail by performing specific numerical analyzes.
Functionally graded materials,Shells,uniform lateral pressure,buckling pressure,Mixed boundary conditions
https://jacm.scu.ac.ir/article_16035.html
https://jacm.scu.ac.ir/article_16035_fc45279d28c6695f444ce1609144384b.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
Measuring Crack-type Damage Features in Thin-walled Composite Beams using De-noising and a 2D Continuous Wavelet Transform of Mode Shapes
355
371
EN
Josué
Pacheco-Chérrez
0000-0003-0678-5091
Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico
a00824133@itesm.mx
Diego
Cárdenas
0000-0002-0512-6839
Tecnologico de Monterrey, School of Engineering and Sciences, General Ramón Corona 2514, CP 45138, Zapopan, Mexico
diego.cardenas@tec.mx
Oliver
Probst
0000-0003-0075-8295
Tecnologico de Monterrey, School of Engineering and Sciences, Av. Eugenio Garza Sada 2051 Sur, Monterrey , CP64849, Mexico
oprobst@tec.mx
10.22055/jacm.2020.35156.2580
A new method is described, allowing to locate and also measure the length and orientation of crack-type damage features in thin-walled composite beams (TWCB), a capability not previously reported. The method is based on a modal-analysis technique and is shown to work on a hollow composite beam, going beyond previous work limited to simple beams and plates. The method is shown to be capable to function down to signal-to-noise ratios (SNR) of about 15, corresponding to far noisier conditions than in most previous work. This capability is achieved by a combination of wavelet de-noising and the use of a 2D Continuous Wavelet Transform (CWT), applied to two modal analysis metrics, COMAC and Mode Shape Differences (MSD). The length and orientation of the crack can be determined accurately using a 2D curve fitting approach. Using either COMAC or MSD produces reliable results, but MSD is found to be somewhat more noise-tolerant. The new method is believed to be useful for the measurement of damage features in a variety of thin-walled composite beams such as aircraft wings and wind turbine blades, among others.
modal analysis,damage detection,damage assessment,2D curve fitting
https://jacm.scu.ac.ir/article_16032.html
https://jacm.scu.ac.ir/article_16032_9c33c1e1db1f0e63ddc82a6131823cdd.pdf
Shahid Chamran University of Ahvaz
Journal of Applied and Computational Mechanics
2383-4536
7
1
2021
01
01
A Case Study of Combined Application of Smart Materials in a Thermal Energy Harvester with Vibrating Action
372
381
EN
Rosen
Mitrev
0000-0001-6276-1225
Department of Logistics Engineering, Material Handling and Construction Machines, Mechanical Engineering Faculty, Technical University of Sofia, Sofia, 1797, Bulgaria
rosenm@tu-sofia.bg
Todor
Todorov
0000-0002-6275-476X
Department of Theory of Mechanisms and Machines, Faculty of Industrial Technology, Technical University of Sofia, Sofia, 1797, Bulgaria
tst@tu-sofia.bg
Andrei
Fursov
0000-0002-6648-2634
Department of Nonlinear Dynamical Systems and Control Processes, Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Moscow, 119991, Russia
fursov@cs.msu.ru
Vasily
Fomichev
0000-0003-2634-3637
Department of Nonlinear Dynamical Systems and Control Processes, Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Moscow, 119991, Russia
fomichev@cs.msu.ru
Alexander
Il‘in
0000-0002-1976-3855
Department of Nonlinear Dynamical Systems and Control Processes, Faculty of Computational Mathematics and Cybernetics, Lomonosov Moscow State University, Moscow, 119991, Russia
iline@cs.msu.ru
10.22055/jacm.2020.35128.2571
This paper demonstrates a case study of a combined application of smart materials in a thermal energy harvester with vibrating action. The conceptual design of the harvester is based on a Shape Memory Alloy wire attached to the free end of a piezoelectric flexible cantilever beam intended for generation of electrical energy utilizing a constant heat source. A mathematical model containing three differential equations describing the dynamics of the mechanical, electrical and thermal subsystems is developed. The Shape Memory Alloy hysteretic behaviour is considered in the mathematical model. An essential observation is the system oscillates at two frequencies lower one of which depends on the temperature time constant and the higher one is determined by the natural frequency of the mechanical subsystem. The comparison of the numerical solutions and the experimentally obtained graphs of the harvester output characteristics shows a good degree of coincidence.
Thermal energy harvester,smart materials,Vibration
https://jacm.scu.ac.ir/article_15958.html
https://jacm.scu.ac.ir/article_15958_aa2e783be1f759add0631977db147903.pdf