THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS最新文献_第7页

A concept of separated numerical formulations for the solution and evaluation of complex field problems 复杂场问题的解和评价的分离数值公式的概念

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1008-1018

A. Buchau, M. Jüttner

{"title":"A concept of separated numerical formulations for the solution and evaluation of complex field problems","authors":"A. Buchau, M. Jüttner","doi":"10.2495/CMEM-V6-N6-1008-1018","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-1008-1018","url":null,"abstract":"Nowadays, a variety of numerical methods and numerical formulations exits to solve complex or coupled field problems in three dimensions. Most of them are generally applicable to nearly arbitrary kind of field problems. On the other hand, some highly optimized methods are available, which are predestined for the solution of a specific kind of problem. Especially in the case of weakly coupled multiphysics problems, a mixture of several numerical methods is very advantages to benefit from different properties of numerical methods for diverse physical sub-problems. A very promising approach for a flexible coordination of the related solution process is the application of software agents. Then, the results of one sub-problem are converted into boundary values or volume source distributions for another sub-problem and software agents choose solution methods independently for each subproblem. Furthermore, two main aspects have to be considered in applications of numerical methods. First, the solution of a boundary value problem should be computed efficiently and second, the solution is evaluated for visualization and interpretation of obtained results. In practice, it is difficult to choose a single appropriate method, which is well suited both for the solution of a problem and its evaluation, since the demands differ in both cases. Here, a concept is presented to apply various numerical methods successfully to the solution and evaluation of complex field problems. Attention is mainly turned on the integration of boundary element methods into the concept of mixed numerical formulations.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"32 1","pages":"1008-1018"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91540157","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

Inverse heat conduction in anisotropic and functionally graded media by finite integration method 有限积分法在各向异性和功能梯度介质中的逆热传导

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/cmem-v6-n6-1149-1160

J. Jin, J. L. Zheng, T. Huang, J. J. Yang, Hua Sheng Wang, P. Wen, J. Li

引用次数: 0

A quasi-static interface damage model with frictional contact – applications to steel reinforced concrete structures 含摩擦接触的准静态界面损伤模型——在钢筋混凝土结构中的应用

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1043-1056

R. Vodička, Filip Kšiňan

{"title":"A quasi-static interface damage model with frictional contact – applications to steel reinforced concrete structures","authors":"R. Vodička, Filip Kšiňan","doi":"10.2495/CMEM-V6-N6-1043-1056","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-1043-1056","url":null,"abstract":"A model for numerical analysis of compound structures made of various materials is presented. The mathematical concept of solution is based on quasi-static evolution of debonding processes occurring along the interface. It is formulated in terms of energies considering the stored energy represented by the elastic energy of the structures and dissipation due to damage processes, plastic slip at the interface or friction. The numerical solution includes a semi-implicit time stepping procedure, relying on splitting of the whole problem at a current time step into two problems of variational nature solved recursively. The space discretisation includes Symmetric Galerkin Boundary Element Method used to obtain the stored energies, and, in combination with the variational character of the recursive problems, also to calculate its gradients to be utilized in non-linear programming algorithms for finding the timeevolving solution. Numerical results are demonstrated for a steel-concrete interface frequently met in civil engineering applications to assess the model applicability in engineering practice.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"63 1","pages":"1043-1056"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90708478","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

An investigation of Eigenfrequencies of boundary integral equations and the Burton-Miller formulation in two-dimensional elastodynamics 二维弹性动力学中边界积分方程的特征频率及Burton-Miller公式的研究

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1127-1137

K. Matsushima, H. Isakari, Toru Takahashi, Toshiro Matsumoto

{"title":"An investigation of Eigenfrequencies of boundary integral equations and the Burton-Miller formulation in two-dimensional elastodynamics","authors":"K. Matsushima, H. Isakari, Toru Takahashi, Toshiro Matsumoto","doi":"10.2495/CMEM-V6-N6-1127-1137","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-1127-1137","url":null,"abstract":"In this study, we investigate the distribution of eigenfrequencies of boundary integral equations (BIEs) of two-dimensional elastodynamics. The corresponding eigenvalue problem is classified as a nonlinear eigenvalue problem. We confirm that the Burton-Miller formulation can properly avoid fictitious eigenfrequencies. The boundary element method (BEM) is expected as a powerful numerical tool for designing sophisticated devices related to elastic waves such as acoustic metamaterials. However, the BEM is known that it loses its accuracy for certain frequencies, called as fictitious eigenfrequencies, for problems defined in the infinite domain. Recent researches It has also been revealed that not only the real-valued eigenfrequencies but also the complex-valued ones may affect the accuracy of the BEM results. We examine the distribution of complex eigenvalues obtained by BIEs for time-harmonic elastodynamic problems with the help of the Sakurai-Sugiura method which is applicable to nonlinear eigenvalue problems. We also examine its relation to the accuracy of the BEM numerical results. We also discuss an appropriate choice of the coupling parameter from a viewpoint of the distribution of fictitious eigenfrequencies.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"32 1","pages":"1127-1137"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78103187","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: 5

Surface equivalence principle and surface integral equation (SIE) revisited for bioelectromagnetics application 表面等效原理和表面积分方程在生物电磁学中的应用

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1182-1191

M. Cvetković, D. Poljak

引用次数: 2

Boundary integral equations of dynamics problems for multi-connected thermoelastic semi-plane with a free boundary 具有自由边界的多连通热弹性半平面动力学问题的边界积分方程

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1120-1126

L. Alexeyeva, B. Alipova

引用次数: 0

Exploring Richtmyer–meshkov Instability Phenomena And The Links Between Surface Perturbations And Shocked-induced Mass Ejection 探索richmyer - meshkov不稳定性现象以及表面扰动与激波诱发的物质抛射之间的联系

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1079-1086

Shin Yina, W. Pei, Zhao Qiang, F. Qijing

{"title":"Exploring Richtmyer–meshkov Instability Phenomena And The Links Between Surface Perturbations And Shocked-induced Mass Ejection","authors":"Shin Yina, W. Pei, Zhao Qiang, F. Qijing","doi":"10.2495/CMEM-V6-N6-1079-1086","DOIUrl":"https://doi.org/10.2495/CMEM-V6-N6-1079-1086","url":null,"abstract":"This work investigates the mass ejected from surface perturbations as the shockwave reaches the AL-vacuum interface, which originates from unstable Richtmyer–Meshkov (RMI) impulse phenomena. The main purpose is to explore the relationships between the shockwave impulse and the geometric properties of surface perturbations, and how those relationships drive the total ejected mass, directionality and velocity distribution. We discuss in detail different types of surface geometry (sinusoidal, square-wave, chevron and semicircle), as well as the wavelengths and amplitudes of surface perturbation. The time evolutions of micro-jet ejection are simulated using a hydrodynamic Lagrangian-Remapping Eulerian method. The calculated results show that primary jetting ejection can be formed from the different shapes, and with increasing wavelength, the ejection mass keeps an increase while the jet head-velocity decreases. However, not all periodic perturbations behave similarly, and masses ejected from irregular surface cannot be normalized to its cross-sectional areas. The square-wave surface may yield pronounced, velocity-enhanced secondary jetting, which is a result of collision of primary jets.","PeriodicalId":22520,"journal":{"name":"THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS","volume":"104 1","pages":"1079-1086"},"PeriodicalIF":0.0,"publicationDate":"2018-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87661049","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

Meshless large plastic deformation analysis considering with a friction coefficient by triple-reciprocity boundary element method 考虑摩擦系数的无网格大塑性变形的三互易边界元分析

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-989-999

Y. Ochiai

引用次数: 8

Simulation of sound structure interactions by the coupled FEM/BEM 声结构相互作用的有限元/边界元耦合模拟

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/CMEM-V6-N6-1067-1078

Z. Yan

引用次数: 0

Boundary value problems for elastic half-planes posed in terms of stress and displacement orientations 基于应力和位移方向的弹性半平面边值问题

THE INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS AND EXPERIMENTAL MEASUREMENTS Pub Date : 2018-01-01 DOI: 10.2495/cmem-v6-n6-1173-1181

A. Galybin

引用次数: 3