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Communications in Numerical Methods in Engineering最新文献

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Numerical modeling of carbon‐based material systems and related topics 碳基材料系统及相关主题的数值模拟
Communications in Numerical Methods in Engineering Pub Date : 2007-12-27 DOI: 10.1002/CNM.1077
I. Tsukrov
{"title":"Numerical modeling of carbon‐based material systems and related topics","authors":"I. Tsukrov","doi":"10.1002/CNM.1077","DOIUrl":"https://doi.org/10.1002/CNM.1077","url":null,"abstract":"","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533682","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
Upwind isoparametric interpolation finite point method for 2D scalar conservation equation 二维标量守恒方程的逆风等参插值有限点法
Communications in Numerical Methods in Engineering Pub Date : 2007-12-17 DOI: 10.1002/CNM.1095
Li Yin, Longjun Shen
{"title":"Upwind isoparametric interpolation finite point method for 2D scalar conservation equation","authors":"Li Yin, Longjun Shen","doi":"10.1002/CNM.1095","DOIUrl":"https://doi.org/10.1002/CNM.1095","url":null,"abstract":"A new upwind isoparametric interpolation finite point (UIIFP) scheme for meshless solver is proposed. This method is developed based on the least-squares procedure and an upwind isoparametric interpolation approximation of the fictitious interface directional flux. The accuracy of UIIFP scheme and 2D test computation is presented. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51535048","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
Variational approach to the free-discontinuity problem of inverse crack identification 逆裂纹识别自由不连续问题的变分方法
Communications in Numerical Methods in Engineering Pub Date : 2007-12-17 DOI: 10.1002/CNM.1078
R. Tsotsova
{"title":"Variational approach to the free-discontinuity problem of inverse crack identification","authors":"R. Tsotsova","doi":"10.1002/CNM.1078","DOIUrl":"https://doi.org/10.1002/CNM.1078","url":null,"abstract":"This work presents a computational strategy for identification of planar defects (cracks) in homogenous isotropic linear elastic solids. The underlying strategy is a regularizing variational approach based on the diffuse interface model proposed by Ambrosio and Tortorelli. With the help of this model, the sharp interface problem of crack identification is split into two coupled elliptic boundary value problems solved using the finite element method. Numerical examples illustrate the application of the proposed approach for effective reconstruction of the position and the shape of a single crack using only the information collected on the surface of the analyzed body.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534081","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
A class of methods and algorithms for the analysis of successive origination of holes in a pre-stressed viscoelastic body. Finite strains 一类预应力粘弹性体孔洞连续起源分析的方法和算法。有限的菌株
Communications in Numerical Methods in Engineering Pub Date : 2007-12-13 DOI: 10.1002/CNM.1080
V. Levin, K. M. Zingerman
{"title":"A class of methods and algorithms for the analysis of successive origination of holes in a pre-stressed viscoelastic body. Finite strains","authors":"V. Levin, K. M. Zingerman","doi":"10.1002/CNM.1080","DOIUrl":"https://doi.org/10.1002/CNM.1080","url":null,"abstract":"A class of methods and algorithms for the solution of two-dimensional quasi-static problems of stress distribution near holes is considered for finite strains. It is assumed that the holes have originated successively in a previously loaded body made of incompressible viscoelastic material. The problem is formulated on the basis of the theory of repeated superposition of large deformations. The mechanical properties of the material are described by convolution integral relations with the kernel of weak singularity. The solution is obtained using the approximate analytical methods (Signorini's technique, Laplace transform, and Muskhelishvili's technique). A special-purpose software for analytical calculations is used for the solution. Some numerical results are presented.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1080","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534167","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: 12
Adaptive FAS-multigrid method for nonlinear elliptic equations on unstructured grids 非结构网格上非线性椭圆方程的自适应多网格法
Communications in Numerical Methods in Engineering Pub Date : 2007-12-12 DOI: 10.1002/CNM.1089
S. Mohamed
{"title":"Adaptive FAS-multigrid method for nonlinear elliptic equations on unstructured grids","authors":"S. Mohamed","doi":"10.1002/CNM.1089","DOIUrl":"https://doi.org/10.1002/CNM.1089","url":null,"abstract":"A two-step, node-wise assembly procedure is developed to enhance the classical assembly process that is repeatedly required for the nonlinear finite elements method. Using the proposed assembly method, an efficient nonlinear point-wise Gauss–Seidel method is designed and used as a smoother in a full approximation storage multigrid (FAS_MG) that results in solving nonlinear problems on unstructured grids as efficient as the linear ones. Next, the FAS_MG solver is incorporated into an adaptive full multigrid cycle that solves the nonlinear problem on a coarse grid and uses a posteriori error estimator to adaptively and automatically construct a next finer grid. Numerical results show that the proposed method solves adaptively nonlinear finite elements elliptic problems within the textbook MG efficiency. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534347","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
Improved atomic meshes 改进的原子网格
Communications in Numerical Methods in Engineering Pub Date : 2007-12-12 DOI: 10.1002/CNM.1074
Claudio Esperança, Antonio A. F. Oliveira, P. R. Cavalcanti
{"title":"Improved atomic meshes","authors":"Claudio Esperança, Antonio A. F. Oliveira, P. R. Cavalcanti","doi":"10.1002/CNM.1074","DOIUrl":"https://doi.org/10.1002/CNM.1074","url":null,"abstract":"SUMMARYThis work describes several improvements over the technique known as Atomic Meshes introducedby Hale[8], which aims at producing numerical meshes from image data “directly”, i.e., bypassingany image segmentation step. We propose two modifications to Hale’s original idea: (1) a procedurewhereby atoms are initially projected onto perceived features, and (2) the introduction of a Laplaciancomponent to the formulation of the energy field governing atom movement. These aim at improvingthe adaptation of the mesh to the image while producing better shaped triangles. True to Hale’sidea, no image segmentation is ever tried, but since the atom placement and movement criteria aremore sensitive to image borders, experiments indicate that the resulting meshes tend to conform moreclosely to the image features. Copyright °c 2000 John Wiley & Sons, Ltd.key words: Numerical meshes; seismic data; image processing 1. IntroductionCreating meshes which approximate or are in some way conformal to the features of a givenimage has captured the attention of many researchers over the last years. The idea is thatthe resulting mesh contains much of the information of the underlying image which makes itideal for applications such as image compression, image modeling, medical image analysis andothers [13].A particularly interesting application is the creation of meshes from seismic images.Traditionally,thegeologicalinterpretationofseismicdataresultsinasetofcurvesandsurfaces,which are used to construct a consistent earth model. This model can then be used to generatediscrete meshes for several kinds of numerical simulations, such as a reservoir simulation,the propagation of acoustic waves, or large-scale fluid and heat flow within saturated poroussediments.The geological model must contain all of the geological features, such as horizons (separatingsurfaces between geological layers) and faults (discontinuities caused by the brittle behavior","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1074","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533477","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
Legendre spectral finite elements for structural dynamics analysis 结构动力学分析的勒让德谱有限元
Communications in Numerical Methods in Engineering Pub Date : 2007-12-06 DOI: 10.1002/CNM.1086
M. Sprague, T. L. Geers
{"title":"Legendre spectral finite elements for structural dynamics analysis","authors":"M. Sprague, T. L. Geers","doi":"10.1002/CNM.1086","DOIUrl":"https://doi.org/10.1002/CNM.1086","url":null,"abstract":"Spectral, hierarchical, and h-type finite elements (FEs) are compared in the context of their application to structural dynamics analysis. The Timoshenko beam, which is the 1-D analog of Mindlin-type shell elements, is used for comparison in eigenvalue and transient-response analyses. A detailed formulation of each method is presented to illustrate clearly their fundamental differences. The principal advantages of spectral FEs over low-order h-type elements are (a) far superior accuracy for a fixed number of model degrees of freedom (DOF) and (b) much higher computational efficiency at a fixed accuracy level. The principal advantages over hierarchical p-type elements are (a) a mass matrix that is inherently diagonal as opposed to full, (b) DOF that pertain directly to nodal displacements and rotations, and (c) more efficient tensor-product factorization. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1086","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51534675","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: 45
Three‐dimensional FE model for fiber interaction effects during microbuckling in composites with isotropic and anisotropic fibers 各向同性和各向异性纤维复合材料微屈曲过程中纤维相互作用的三维有限元模型
Communications in Numerical Methods in Engineering Pub Date : 2007-11-30 DOI: 10.1002/CNM.1084
Y. Lapusta, J. Harich, W. Wagner
{"title":"Three‐dimensional FE model for fiber interaction effects during microbuckling in composites with isotropic and anisotropic fibers","authors":"Y. Lapusta, J. Harich, W. Wagner","doi":"10.1002/CNM.1084","DOIUrl":"https://doi.org/10.1002/CNM.1084","url":null,"abstract":"A three-dimensional finite element model is proposed for the fiber interaction effects during fiber microbuckling in fiber-reinforced composites. The model considers an elastic matrix reinforced by a periodic fiber series subjected to compression in axial direction. It accounts for the distinct difference in mechanical properties of the reinforcement and the matrix, as well as for the spatial problem character at the fiber-matrix scale. Perfect bonding at the fiber-matrix interfaces and the periodicity of the buckled system in the plane of fibers (in-plane microbuckling) are assumed. For comparison purposes, a dilute approximation model dealing with a single fiber in a matrix is presented as well. An eigenvalue analysis of the considered systems fiber-matrix is performed. Calculations are carried out for the cases of both isotropic and transversal isotropic fibers in elastic isotropic matrices. Results show that the fiber interaction results in a significant increase in the buckling wavelength and in an important decrease in the critical shortening.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1084","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533914","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: 12
Space-time discontinuous Galerkin method for dynamics of solids 固体动力学的时空不连续伽辽金方法
Communications in Numerical Methods in Engineering Pub Date : 2007-11-29 DOI: 10.1002/CNM.1075
H. Aksoy, E. Şenocak
{"title":"Space-time discontinuous Galerkin method for dynamics of solids","authors":"H. Aksoy, E. Şenocak","doi":"10.1002/CNM.1075","DOIUrl":"https://doi.org/10.1002/CNM.1075","url":null,"abstract":"In this study, a space–time discontinuous Galerkin formulation is derived for dynamic analysis of solids. Numerical implementation of proposed formulation is presented, and numerical examples are provided for shock wave propagation problems. Numerical results are compared with that of the known exact solutions of the problems and numerical results obtained from a commercial finite element code. The proposed space–time discontinuous Galerkin formulation is found to be robust and successful in modelling transient problems, i.e. shock wave propagation problems. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1075","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533555","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: 6
Numerical modelling of hydro-mechanical behaviour of collapsible soils 湿陷性土壤水力学特性的数值模拟
Communications in Numerical Methods in Engineering Pub Date : 2007-11-29 DOI: 10.1002/CNM.1071
L. Costa, I. Pontes, L. Guimarães, S. R. M. Ferreira
{"title":"Numerical modelling of hydro-mechanical behaviour of collapsible soils","authors":"L. Costa, I. Pontes, L. Guimarães, S. R. M. Ferreira","doi":"10.1002/CNM.1071","DOIUrl":"https://doi.org/10.1002/CNM.1071","url":null,"abstract":"This paper presents a numerical simulation of the response of unsaturated soil under different loads, with special attention devoted to the phenomenon of pore collapse during wetting. A coupled hydro-mechanical formulation, implemented in the computational code CODE_BRIGHT, is first presented. Then the model is applied to assess material parameter from laboratory tests and to simulate, as boundary value problems, new and appealing in situ tests designed in the Federal University of Pernambuco. The soil considered is a collapsible soil located in the semi-arid region of the northeast of Brazil. Two situations are analysed: (i) the soil is initially at its natural water content and then flooded at some determined stress level, (ii) the soil is previously flooded and then loaded. Comparison between output results of numerical simulations and experimental data shows a very good agreement, which validate to some extent the proposed experimental procedure and the model formulation. Copyright © 2007 John Wiley & Sons, Ltd.","PeriodicalId":51245,"journal":{"name":"Communications in Numerical Methods in Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2007-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/CNM.1071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"51533319","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: 18
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