Applied and Computational Mechanics最新文献_第3页

Numerical Simulation of Fuzzy Volterra Integro-differential Equation using Improved Runge-Kutta Method 基于改进龙格-库塔法的模糊Volterra积分-微分方程数值模拟

Applied and Computational Mechanics Pub Date : 2021-11-09 DOI: 10.22055/JACM.2021.38381.3212

F. Rabiei, Fatin Abd Hamid, Mohammad Mehdi Rashidi, Zeeshan Ali, K. Shah, K. Hosseini, T. Khodadadi

{"title":"Numerical Simulation of Fuzzy Volterra Integro-differential Equation using Improved Runge-Kutta Method","authors":"F. Rabiei, Fatin Abd Hamid, Mohammad Mehdi Rashidi, Zeeshan Ali, K. Shah, K. Hosseini, T. Khodadadi","doi":"10.22055/JACM.2021.38381.3212","DOIUrl":"https://doi.org/10.22055/JACM.2021.38381.3212","url":null,"abstract":"In this research, fourth-order Improved Runge-Kutta method with three stages for solving fuzzy Volterra integro-differential (FVID) equations of the second kind under the concept of generalized Hukuhara differentiability is proposed. The advantage of the proposed method in this study compared with the same order classic Runge-Kutta method is, Improved Runge-Kutta (IRK) method uses a fewer number of stages in each step which causes less computational cost in total. Here, the integral part is approximated by applying the combination of Lagrange interpolation polynomials and Simpson’s rule. The numerical results are compared with some existing methods such as the fourth-order Runge-Kutta (RK) method, variational iteration method (VIM), and homotopy perturbation method (HPM) to prove the efficiency of IRK method. Based on the obtained results, it is clear that the fourth-order Improved Runge-Kutta method with higher accuracy and less number of stages which leads the less computational cost is more efficient than other existing methods for solving FVID equations.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48994332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Magneto Casson-Carreau Fluid Flow through a Circular Porous Cylinder with Partial Slip 磁流体在部分滑移多孔圆柱中的流动

Applied and Computational Mechanics Pub Date : 2021-11-08 DOI: 10.22055/JACM.2021.38390.3215

N. Nagendra, B. Venkateswarlu, Z. Boulahia, C. Amanulla, G. K. Ramesh

引用次数: 6

Calculation of Backscattered Ultrasonic Waves Field from a Copper-clad Steel Rod Immersing in Water and Effect of Clad Corrosion and Interfacial Disbond between Clad and Rod Defects on this Field using the Finite Element Method 用有限元法计算铜包钢棒在水中的后向散射超声波场及包层腐蚀和包层与棒间界面脱粘对该场的影响

Applied and Computational Mechanics Pub Date : 2021-11-04 DOI: 10.22055/JACM.2021.38098.3172

Omid Noormohammadi Arani, Mehdi Zeighami Salimabad, A. Yaghootian, M. Kari

{"title":"Calculation of Backscattered Ultrasonic Waves Field from a Copper-clad Steel Rod Immersing in Water and Effect of Clad Corrosion and Interfacial Disbond between Clad and Rod Defects on this Field using the Finite Element Method","authors":"Omid Noormohammadi Arani, Mehdi Zeighami Salimabad, A. Yaghootian, M. Kari","doi":"10.22055/JACM.2021.38098.3172","DOIUrl":"https://doi.org/10.22055/JACM.2021.38098.3172","url":null,"abstract":"Inspection and specificity of the intactness of multi-layer and small-size parts like copper-clad steel rod is a hard task and requires high accuracy. The intactness of these parts is crucial due to their importance. One of the inspection methods for these parts is using ultrasonic waves. The scattering phenomenon occurs when these waves impact curved shape bodies under a special condition. The ultrasonic scattering waves contain a lot of information from the physical conditions and mechanical properties of the part. However, using these waves requires high accuracy and attention due to their complexity. One result of the ultrasonic scattering waves is the far-field backscattered frequency spectrum, form function. For the first time in this research, the form function of a copper-clad steel rod that is immersed in water is calculated using the finite element method (FEM) available in the commercial ABAQUS software. For validating the proposed model, the simulation results are compared with analytical and experimental results in the normalized frequency range of 4 £ Ka £ 10. A good agreement is observed between the three methods at the resonance frequencies, and in the overall form of obtained form function. Furthermore, the effects of the two most common defects in these rods, i.e., the corrosion and interfacial disbond between the clad and steel rod, is studied. Results show that this method can properly specify the corrosion percentage and location, and also the length and location of the interfacial disbond defect.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47848060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Proportional Topology Optimization under Reliability-based Constraints 基于可靠性约束的比例拓扑优化

Applied and Computational Mechanics Pub Date : 2021-11-04 DOI: 10.22055/JACM.2021.38440.3226

R. R. Amaral, Julian Alves Borges, H. Gomes

引用次数: 2

Mixed Convection Heat Transfer and Entropy Generation in a Water-Filled Square Cavity Partially Heated from Below: Effect of the Richardson and Prandtl numbers 部分从下加热的方形充水腔内的混合对流传热和熵生成:Richardson和Prandtl数的影响

Applied and Computational Mechanics Pub Date : 2021-10-17 DOI: 10.22055/JACM.2021.38614.3259

S. Boudebous, Nawal Ferroudj, H. Koten

{"title":"Mixed Convection Heat Transfer and Entropy Generation in a Water-Filled Square Cavity Partially Heated from Below: Effect of the Richardson and Prandtl numbers","authors":"S. Boudebous, Nawal Ferroudj, H. Koten","doi":"10.22055/JACM.2021.38614.3259","DOIUrl":"https://doi.org/10.22055/JACM.2021.38614.3259","url":null,"abstract":"In the present study, fluid flow, heat transfer, and entropy generation for mixed convection inside a water-filled square cavity were investigated numerically. The sidewalls of the cavity, which move upwards, are kept at low-temperature 𝑇𝑐 while only a part in the center of the bottom wall is kept at high-temperature 𝑇ℎ and the remaining parts are kept adiabatic. The governing equations, in stream function–vorticity form, are discretized and solved using the finite difference method. Particular attention was paid to the influence of the Prandtl numbers of 5.534, 3.045, and 2, corresponding respectively to the water temperatures of 303,15 K, 333,15 K, and 363,15 K. The numerical results are presented in the form of streamlines, isotherms, and entropy generation contours for different values of the Richardson numbers at an arbitrary Reynolds number Re=102. Besides this, the evolution of the average Nusselt number and the average entropy generation is also reported. The obtained results show interesting behaviors of the flow and thermal fields, which mainly involve stable symmetric and non-symmetric steady-state solutions, as well as unsteady regimes, depending on specific values of the Richardson and Prandtl numbers. It is additionally observed that the average Nusselt number increases and the average entropy generation decreases when both the Richardson and Prandtl numbers increase.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46493110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Investigation of Wood Properties at Elevated Temperature 高温下木材性能的研究

Applied and Computational Mechanics Pub Date : 2021-10-17 DOI: 10.22055/JACM.2021.38486.3239

A. Bragov, Tatiana Iuzhina, A. Lomunov, L. Igumnov, A. Belov, V. Eremeyev

引用次数: 2

Computational Enhancement of a Mixed 3D Beam Finite Element with Warping and Damage 具有翘曲和损伤的混合三维梁有限元的计算增强

Applied and Computational Mechanics Pub Date : 2021-10-16 DOI: 10.22055/JACM.2021.37948.3120

P. Re, D. Addessi

引用次数: 5

Prediction Capabilities of a One-dimensional Wall-flow Particulate Filter Model 一维壁流颗粒过滤器模型的预测能力

Applied and Computational Mechanics Pub Date : 2021-10-15 DOI: 10.22055/JACM.2021.38708.3270

A. N. Impiombato, C. Biserni, M. Milani, L. Montorsi

引用次数: 0

Development of an Educational Code of Deriving Equations of Motion and Analyzing Dynamic Characteristics of Multibody Closed Chain Systems using GNU Octave for a Beginner 初学者用GNU八度曲推导运动方程及分析多体闭链系统动力学特性教学程序的开发

Applied and Computational Mechanics Pub Date : 2021-10-13 DOI: 10.22055/JACM.2021.38021.3132

Yonghui Park

{"title":"Development of an Educational Code of Deriving Equations of Motion and Analyzing Dynamic Characteristics of Multibody Closed Chain Systems using GNU Octave for a Beginner","authors":"Yonghui Park","doi":"10.22055/JACM.2021.38021.3132","DOIUrl":"https://doi.org/10.22055/JACM.2021.38021.3132","url":null,"abstract":"In this study, an automatic GNU Octave code, a free high-level language, for the educational purposes was developed to derive equations of motion and constrain equations of a multibody closed chain system and to calculate the response of the system. The code for calculating the dynamic response was developed by formulating several equations in symbolic expression and extracting differential-algebraic equations in matrix form. The code has a similar structure to the previous code for the open chained system, but it deals with the constraint equation and different numerical integration. The examples of closed chain systems provide an additional procedure to derive the constraint equations by using Lagrangian multiplication theory and to solve the differential-algebraic equations using the Runge-Kutta method. The code was made to understand the theory of analysis and the structure of calculation easily. In addition, the code has an automatic process of the derivation of the Lagrange equation and the constraint equations in matrix form after inputting the number of symbolic information such as position and velocity coordinates and design variables of the system that the user wants to review. The code was validated by comparing the dynamic response of the four-bar linkage with the same design variables and initial conditions of the previous work. By using the code, the reader's ability to exchange information such as symbols and matrices will be expected to be improved.","PeriodicalId":37801,"journal":{"name":"Applied and Computational Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45240220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Magnetized Bi-convective Nanofluid Flow and Entropy Production Using Temperature-sensitive Base Fluid Properties: A Unique Approach 利用温度敏感基础流体特性的磁化双对流纳米流体流动和熵产生：一种独特的方法

Applied and Computational Mechanics Pub Date : 2021-10-05 DOI: 10.22055/JACM.2021.38204.3177

Tapas Barman, S. Roy, Ali J. Chamkha

引用次数: 0