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Dissertations / Theses on the topic 'Boundary element method (BEM)'

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Published: 4 June 2021

Last updated: 25 July 2025

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1

MITRA, KAUSIK PRADIP. "APPLICATION OF MULTIPOLE EXPANSIONS TO BOUNDARY ELEMENT METHOD." University of Cincinnati / OhioLINK, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1026411773.

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2

Chaudhari, Sachin B. "DEVELOPMENT OF AN INTERNET-BASED ANALYSIS TOOL USING THE BOUNDARY ELEMENT METHOD." University of Cincinnati / OhioLINK, 2000. http://rave.ohiolink.edu/etdc/view?acc_num=ucin971963697.

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3

KEUM, BANGYONG. "ANALYSIS OF 3-D CONTACT MECHANICS PROBLEMS BY THE FINITE ELEMENT AND BOUNDARY ELEMENT METHODS." University of Cincinnati / OhioLINK, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1054815631.

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Bozkaya, Canan. "Boundary Element Method Solution Of Initial And Boundary Value Problems In Fluid Dynamics And Magnetohydrodynamics." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/12609552/index.pdf.

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In this thesis, the two-dimensional initial and boundary value problems invol-ving convection and diffusion terms are solved using the boundary element method (BEM). The fundamental solution of steady magnetohydrodynamic (MHD) flow equations in the original coupled form which are convection-diffusion type is established in order to apply the BEM directly to these coupled equations with the most general form of wall conductivities. Thus, the solutions of MHD flow in rectangular ducts and in infinite regions with mixed boundary conditions are obtained for high values of Hartmann number, M. For

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5

Bozkaya, Nuray. "Application Of The Boundary Element Method To Parabolic Type Equations." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/3/12612074/index.pdf.

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In this thesis, the two-dimensional initial and boundary value problems governed by unsteady partial differential equations are solved by making use of boundary element techniques. The boundary element method (BEM) with time-dependent fundamental solution is presented as an efficient procedure for the solution of diffusion, wave and convection-diffusion equations. It interpenetrates the equations in such a way that the boundary solution is advanced to all time levels, simultaneously. The solution at a required interior point can then be obtained by using the computed boundary solution. Then,

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6

Grasso, Eva. "Modelling visco-elastic seismic wave propagation : a fast-multipole boundary element method and its coupling with finite elements." Phd thesis, Université Paris-Est, 2012. http://tel.archives-ouvertes.fr/tel-00730752.

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The numerical simulation of elastic wave propagation in unbounded media is a topical issue. This need arises in a variety of real life engineering problems, from the modelling of railway- or machinery-induced vibrations to the analysis of seismic wave propagation and soil-structure interaction problems. Due to the complexity of the involved geometries and materials behavior, modelling such situations requires sophisticated numerical methods. The Boundary Element method (BEM) is a very effective approach for dynamical problems in spatially-extended regions (idealized as unbounded), especially s

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INOUE, NELSON. "IMPLEMENTATION OF A COMPUTER CODE CONSIDERING THE COUPLING OF THE FINITE ELEMENT METHOD (FEM) AND THE BOUNDARY ELEMENT METHOD (BEM)." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1998. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1522@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>O presente trabalho tem como principais objetivos estudar a formulação do método dos elementos de contorno e implementar um programa computacional para análise de tensões de problemas bi-dimensionais (estado plano de deformação e axissimetria) considerando também a possibilidade de acoplamento dos métodos dos elementos de contorno (MEC) e dos elementos finitos (MEF). Dentro deste estudo são abordados as soluções fundamentais para materiais linearmente elásticos, a formulação das integrais no contorno, as técnicas para t

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8

Fic, Miloslav. "Metoda hraničních vířivých elementů pro 2D proudění kapalin." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230563.

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This master’s thesis deals with boundary vorticity element method for 2D fluid flow. The aim of this work is to program this method with continuous vorticity lay-out and to validate method with various boundary conditions. The computed results are presented in this work. Advantages and disadvantages of each one boundary condition are pointed out. New one boundary condition for boundary vorticity element method is applied in this thesis.

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9

Kottke, Peter Arthur. "Rheological Implications of Tension in Liquids." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5015.

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This research investigates effects of tensile stresses in liquids. Areas of application include bearing lubrication and polymer processing, in which liquids may be subjected to hydrostatic tension or large shear stresses. A primary thrust of this research is the development of a criterion for liquid failure, or cavitation, based upon the general state of stress in the liquid. A variable pressure, rotating inner cylinder, Couette viscometer has been designed and used to test a hypothesized cavitation criterion. The criterion, that cavitation will occur when a principal normal stress in a liq

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10

Junior, Eduardo Toledo de Lima. "Isotropic damage phenomena in saturated porous media: a bem formulation." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24032011-092148/.

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This work is devoted to the numerical analysis of saturated porous media, taking into account the damage phenomenon on the solid skeleton. The porous media is taken into poroelastic framework, in full-saturated condition, based on the Biot\'s Theory. A scalar damage model is assumed for this analysis. An implicit Boundary Element Method (BEM) formulation, based on time-independent fundamental solutions, is developed and implemented to couple the fluid flow and the elasto-damage problems. The integration over boundary elements is evaluated by using a numerical Gauss procedure. A semi-analytical

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11

Lin, Jauhorng. "A study of instability of elastic plates by BEM /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9823334.

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12

Liquori, Riccardo. "Numerical and experimental study of a heaving buoy for modelling a wave energy converter for WECfarm project." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Waves from Ocean are a huge unexploited energy resource, and the potential for extracting energy from waves is significant. Oceanic surface waves carry a much higher energy density, sometimes by two orders of magnitude, than solar and wind. For this reason, different Wave Energy Converter (WEC) designs have been developed in recent years. Among all the technologies available to convert wave energy, the point-absorber is one of the most promising solutions today, due to its ease of both fabrication and installation. In most cases, the WEC will not be installed in single units but arranged in pa

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Toledo, de Lima Junior Eduardo. "Isotropic damage phenomena in saturated porous media : a BEM formulation." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2011. http://tel.archives-ouvertes.fr/tel-00749754.

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This work is devoted to the numerical analysis of saturated porous media, taking into accountthe damage phenomenon on the solid skeleton. The porous media is taken into poroelasticframework, in full-saturated condition, based on the Biot's Theory. A scalar damage model isassumed for this analysis. An implicit Boundary element Method (BEM) formulation, basedon time-independent fundamental solutions, is developed and implemented to couple thefluid flow and the elasto-damage problems. The integration over boundary elements isevaluated by using a numerical Gauss procedure. A semi-analytical scheme

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Ahmadi, Habiburrahman. "Lateral torsional buckling of anisotropic laminated composite beams subjected to various loading and boundary conditions." Diss., Kansas State University, 2017. http://hdl.handle.net/2097/35402.

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Doctor of Philosophy<br>Department of Civil Engineering<br>Hayder A. Rasheed<br>Thin-walled structures are major components in many engineering applications. When a thin-walled slender beam is subjected to lateral loads, causing moments, the beam may buckle by a combined lateral bending and twisting of cross-section, which is called lateral-torsional buckling. A generalized analytical approach for lateral-torsional buckling of anisotropic laminated, thin-walled, rectangular cross-section composite beams under various loading conditions (namely, pure bending and concentrated load) and boundary

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Queiroz, Paulo César de Oliveira. "Análise estática e dinâmica de estruturas reticuladas : ambiente de simulçaão em JAVA." Universidade Federal da Paraíba, 2010. http://tede.biblioteca.ufpb.br:8080/handle/tede/5423.

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Made available in DSpace on 2015-05-08T15:00:09Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3383903 bytes, checksum: 0f620c6e964fe188ec48ca2d255558c8 (MD5) Previous issue date: 2010-10-28<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work a static and dynamic elastic analyses of frame structures using the finite element method (FEM) is described. The superstructure is modeled employing six sets of frame structures (plane truss, space truss, plane frame, grilled, space frame and space frame stiffened by shear cores) and specific finite elements are

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Cavalcanti, Daniel Jatobá de Holanda. "Análise da interação solo-estrutura através do emprego conjunto dos métodos dos elementos de contorno e elementos finitos." Universidade Federal de Alagoas, 2006. http://repositorio.ufal.br/handle/riufal/376.

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In this work, it is proposed a mechanical behavior analysis of the soil-structure interaction from the development of a computational code using a coupling static formulation of Boundary Element Method (BEM) and Finite Element Method (FEM) for the displacements and stress calculation in structures in contact to the half space. Thus, it is intended to model the structure using the bending plate finite element DKT (discrete Kirchhoff triangle) and applying the concepts of the Boundary Element Method (BEM) formulation to model the soil, considered as a half- infinite and/or infinite space and usi

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Almeida, Francisco Patrick Araujo. "Aplicação do acoplamento entre o MEC e o MEF para o estudo da interação dinâmica elastoplástica entre o solo e estruturas." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-20062006-154024/.

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O objetivo do presente trabalho é o desenvolvimento de um código computacional que possibilite a análise dinâmica de estruturas tridimensionais em regime elástico-linear acopladas ao solo, tratado como meio infinito elastoplástico. As superestruturas são tratadas por elementos finitos simples de casca e de barra geral, as estruturas de fundações são tratadas por elementos de casca que simulam o contato com o solo, modelando radiers, túneis e reservatórios enterrados. Blocos são modelados por elementos de contorno tridimensionais. O solo é modelado de duas maneiras distintas: na região plastifi

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Oliveira, Hugo Luiz. "Modelos numéricos aplicados à análise viscoelástica linear e à otimização topológica probabilística de estruturas bidimensionais: uma abordagem pelo Método dos Elementos de Contorno." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-27042017-093145/.

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O presente trabalho trata da formulação e implementação de modelos numéricos baseados no Método dos Elementos de Contorno (MEC). Inspirando-se em problemas de engenharia, uma abordagem multidisciplinar é proposta como meio de representação numérica mais realista. Há materiais de uso corrente na engenharia que possuem resposta dependente do tempo. Nesta tese os fenômenos dependentes do tempo são abordados por meio da Mecânica Viscoelástica Linear associada a modelos reológicos. Neste trabalho, se apresenta a dedução do modelo constitutivo de Maxwell para ser utilizado via MEC. As equações deduz

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19

Rocha, Fabio Carlos da. "Análise de domínios reforçados através da combinação MEC/MEF considerando modelos de aderência." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-08022010-091447/.

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Neste trabalho, uma combinação do Método dos Elementos de Contorno (MEC) com o Método dos Elementos Finitos (MEF) é apresentada para análise bidimensional de sólidos elastostáticos reforçados, sendo considerados modelos de aderência no acoplamento. O elemento de contorno é adotado para modelar o comportamento do domínio, enquanto que o modelo por elementos finitos é utilizado para modelar o enrijecedor. Devido às singularidades nas equações integrais do MEC, estudou-se o erro ocasionado pelos integrandos de ordem e e como conseqüência sugerem-se, neste trabalho, equações mais simples para

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20

Passos, José Jarbson Salustiano dos. "Análise da estabilidade estatíca e dinâmica de vigas pelo método dos elementos de contorno." Universidade Federal da Paraíba, 2014. http://tede.biblioteca.ufpb.br:8080/handle/tede/5387.

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Made available in DSpace on 2015-05-08T14:59:59Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2498464 bytes, checksum: f14d53abab590dc87f310472963c08ad (MD5) Previous issue date: 2014-09-29<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work new solutions based on the direct Boundary Element Method (BEM) for static and dynamic stability beam problems are presented. Both Euler-Bernoulli and Timoshenko models are used to represent the beam responses. All discussions on mathematical steps to write down the BEM representation are presented. Alternative f

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21

Ni, Marcus. "Automated Hybrid Singularity Superposition and Anchored Grid Pattern BEM Algorithm for the Solution of the Inverse Geometric Problem." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5827.

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A method for solving the inverse geometrical problem is presented by reconstructing the unknown subsurface cavity geometry using boundary element methods, a genetic algorithm, and Nelder-Mead non-linear simplex optimization. The heat conduction problem is solved utilizing the boundary element method, which calculates the difference between the measured temperature at the exposed surface and the computed temperature under the current update of the unknown subsurface flaws and cavities. In a first step, clusters of singularities are utilized to solve the inverse problem and to identify the locat

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Prnka, Jiří. "Výpočtové modelování hluku v kabině letounu VUT 100 Cobra." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229032.

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This master’s thesis deals with the computational simulation of low-frequency noise inside the cabin of small commercial airplane VUT 100 Cobra. For this low-frequncy range deterministic methods: Final Element Method (FEM) and Boundary Element Method (BEM) are used for simulation of the dynamic behaviour of the object. FEM has been used to compute eigenmodes and eigenfrequences of the structure of the aeroplane cabin and of the acoustic space inside cabin. Then response to harmonic excitation of engine represented by unit forces in place of contact has been computed. Obtained velocities on the

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23

Ferro, Newton Carlos Pereira. "Uma combinação MEC/MEF para análise de interação solo-estrutura." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-08122017-102331/.

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No presente trabalho, uma combinação do método dos elementos de contorno (MEC) com o método dos elementos finitos (MEF) é apresentada para a análise da interação entre estacas e o solo, considerado como um meio infinito tridimensional e homogêneo. O meio contínuo tridimensional de domínio infinito é modelado pelo MEC, enquanto as estacas consideradas como elementos reticulares são tratadas pelo MEF. As equações das estacas oriundas do método dos elementos finitos são combinadas com as do meio contínuo obtidas a partir do método dos elementos de contorno, resultando em um sistema completo de eq

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Silva, Filho Elson Borges da [UNESP]. "Estudo de campo elétrico em linha de transmissão utilizando o método dos elementos de contorno." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/87237.

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Made available in DSpace on 2014-06-11T19:22:35Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-03-28Bitstream added on 2014-06-13T20:49:17Z : No. of bitstreams: 1 silvafilho_eb_me_ilha.pdf: 1002165 bytes, checksum: 7b47e608bd37c2b8a03cccc84f847230 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Este trabalho analisa a aplicação em linhas de transmissão do método dos elementos de contorno para cálculo de potencial e campo elétrico, com um enfoque em eletrostática. O método dos elementos de contorno baseia-se numa formulação integral que elimina a discre

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Maia, Cibelle Dias de Carvalho Dantas. "Flexão e estabilidade de barras usando o modelo de Bickford-Reddy: uma abordagem pelo método dos elementos de contorno." Universidade Federal da Paraíba, 2016. http://tede.biblioteca.ufpb.br:8080/handle/tede/9110.

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Submitted by Viviane Lima da Cunha (viviane@biblioteca.ufpb.br) on 2017-07-18T12:41:11Z No. of bitstreams: 1 arquivototal.pdf: 2094299 bytes, checksum: 783d6f9949086fb75e4a51fc3adbd48a (MD5)<br>Made available in DSpace on 2017-07-18T12:41:11Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 2094299 bytes, checksum: 783d6f9949086fb75e4a51fc3adbd48a (MD5) Previous issue date: 2016-04-22<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>In this work, new solutions based on the Boundary Element Method (BEM) are established for the linear analysis of bending and stability pro

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Cruz, José Marcílio Filgueiras. "Contribuição à análise estática e dinâmica de pórticos pelo Método dos Elementos de Contorno." Universidade Federal da Paraíba, 2012. http://tede.biblioteca.ufpb.br:8080/handle/tede/5355.

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Made available in DSpace on 2015-05-08T14:59:48Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 7220631 bytes, checksum: d36ace240b1aa4b1c66a0ca9ae99326d (MD5) Previous issue date: 2012-10-18<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>This paper describes elastic, static and dynamic analysis of frames using the Boundary Element Method (BEM). The superstructure is modeled for two frame structure cases (that is, plane frame and space frame) and algebraic specific representations are developed for these purposes. According to the specific cases, bending effects (

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Carmo, Regina Maria dos Santos. "Determinação da rigidez de estruturas de pavimentos através dos métodos dos elementos de contorno e finitos." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-05042016-135834/.

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O tema desta pesquisa refere-se ao tratamento numérico de estruturas de pavimentos, dando ênfase à utilização do método dos elementos de contorno - MEC para o tratamento de elementos planos, enquanto os elementos lineares serão tratados através do método dos elementos finitos - MEF. Busca-se contribuir com uma série de trabalhos realizados nesta área, principalmente com a consideração do efeito da excentricidade do eixo neutro das barras em relação à superfície neutra da placa somando-o, portanto, ao fenômeno de flexão desta última. A técnica de acoplamento dos elementos estruturais utilizada

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Ribeiro, Dimas Betioli. "Análise da interação solo-estrutura via acoplamento MEC-MEF." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-31052005-121131/.

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O objetivo central deste trabalho é o estudo da interação do solo com a estrutura. Para tanto, são introduzidos mais recursos na ferramenta numérica desenvolvida no trabalho de Almeida (2003a). O solo é modelado pelo método dos elementos de contorno (MEC) tridimensional, aplicando a solução fundamental de Kelvin. É possível analisar problemas nos quais o solo é composto por camadas de diferentes características físicas, apoiadas em uma superfície de deslocamento nulo e enrijecidas por elementos de fundação, também modelados pelo MEC tridimensional. A superestrutura tridimensional, diferentemen

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Oliveira, Charles Jaster de. "Análise da interação placa-viga via método dos elementos de contorno." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-15102012-130014/.

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Este trabalho apresenta o estudo de uma formulação do método dos elementos de contorno para a análise da interação placa-viga de pavimentos de edifícios. Para compatibilizar adequadamente as vigas e a placa, é utilizada uma formulação alternativa do método dos elementos de contorno para placas delgadas em que, a viga é modelada por equações diferenciais ordinárias e, a compatibilidade entre a placa e a viga é feita por meio dos deslocamentos e forças de ligação nos nós dos elementos. Após a imposição das condições de contorno e resolução final do sistema de equações, são obtidos os esforços na

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Silva, Filho Elson Borges da. "Estudo de campo elétrico em linha de transmissão utilizando o método dos elementos de contorno /." Ilha Solteira : [s.n.], 2008. http://hdl.handle.net/11449/87237.

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Orientador: Luiz Fernando Bovolato<br>Banca: Sérgio Kurokawa<br>Banca: Afonso José do Prado<br>Resumo: Este trabalho analisa a aplicação em linhas de transmissão do método dos elementos de contorno para cálculo de potencial e campo elétrico, com um enfoque em eletrostática. O método dos elementos de contorno baseia-se numa formulação integral que elimina a discretização do domínio, restando apenas o contorno, permitindo o cálculo do potencial e do campo elétrico no contorno e na região estudada. O trabalho configura-se como uma revisão sobre eletrostática, ressaltando as equações de Laplace e

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Kamrath, Matthew. "Extending standard outdoor noise propagation models to complex geometries." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1038/document.

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Les méthodes d'ingénierie acoustique (e.g. ISO 9613-2 ou CNOSSOS-EU) approchent efficacement les niveaux de bruit générés par les routes, les voies ferrées et les sources industrielles en milieu urbain. Cependant, ces approches d'ingénierie sont limitées à des géométries de forme simple, le plus souvent de section rectangulaire. Ce mémoire développe donc, et valide, une approche hybride permettant l'extension des méthodes d'ingénierie à des formes plus complexes, en introduisant un terme d’atténuation supplémentaire qui représente l'effet d'un objet réel comparé à un objet simple.Le calcul de

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Laurent, Philippe. "Méthodes d'accéleration pour la résolution numérique en électrolocation et en chimie quantique." Thesis, Nantes, Ecole des Mines, 2015. http://www.theses.fr/2015EMNA0122/document.

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Cette thèse aborde deux thématiques différentes. On s’intéresse d’abord au développement et à l’analyse de méthodes pour le sens électrique appliqué à la robotique. On considère en particulier la méthode des réflexions permettant, à l’image de la méthode de Schwarz, de résoudre des problèmes linéaires à partir de sous-problèmes plus simples. Ces deniers sont obtenus par décomposition des frontières du problème de départ. Nous en présentons des preuves de convergence et des applications. Dans le but d’implémenter un simulateur du problème direct d’électrolocation dans un robot autonome, on s’in

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Healey, Martin. "The mortar boundary element method." Thesis, Brunel University, 2010. http://bura.brunel.ac.uk/handle/2438/4355.

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This thesis is primarily concerned with the mortar boundary element method (mortar BEM). The mortar finite element method (mortar FEM) is a well established numerical scheme for the solution of partial differential equations. In simple terms the technique involves the splitting up of the domain of definition into separate parts. The problem may now be solved independently on these separate parts, however there must be some sort of matching condition between the separate parts. Our aim is to develop and analyse this technique to the boundary element method (BEM). The first step in our journey t

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Almeida, Valério da Silva. "Análise da interação solo não-homogêneo/estrutura via acoplamento MEC/MEF." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-31032016-094320/.

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O estudo do comportamento mecânico do complexo sistema advindo da interação entre solo/subestrutura/superestrutura é o tema do trabalho. Neste contexto, a representação do maciço é feita usando-se o método dos elementos de contorno (MEC) em abordagem 3D, de maneira que se possa simular o maciço com características mecânicas não-homogêneas, além de se considerar uma camada de apoio indeslocável a distâncias prescritas a priori e condição de aderência perfeita. A subestrutura também é representada via MEC tridimensional, a qual está imersa dentro deste meio heterogêneo. A infra e a superestrutur

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35

Wutzow, Wilson Wesley. "Formulação do método dos elementos de contorno para materiais porosos reforçados." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-27082008-111607/.

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Neste trabalho, propõe-se uma formulação não linear baseada no método dos elementos de contorno, para representação de domínios poro-elasto-plásticos reforçados. Esta formulação é apresentada para os casos saturado e não saturado. Para o problema poroso enrijecido um acoplamento com o método dos elementos finitos é empregado, e a técnica de mínimos quadrados permite a regularização dos deslocamentos e do vetor de forças de superfície ao longo das interfaces de acoplamento. São empregadas expressões analíticas para o tratamento das integrais de contorno e de domínio presentes na formulação do m

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Ademoyero, Oreoluwa Oyinlade. "A parallel Galerkin boundary element method." Thesis, University of Hertfordshire, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.410144.

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Elzein, Abbas. "Plate stability by boundary element method." Thesis, University of Southampton, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.255672.

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Mavaleix-Marchessoux, Damien. "Modelling the fluid-structure coupling caused by a far-field underwater explosion." Electronic Thesis or Diss., Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAE012.

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Les sous-marins militaires doivent résister aux sollicitations induites par une explosion sous-marine. Pour s'en assurer, la simulation numérique est d'une importance capitale, compte tenu du coût très élevé des campagnes expérimentales. Une explosion sous-marine lointaine est un événement complexe qui a deux effets distincts : elle libère une onde de choc, puis crée une bulle de gaz oscillante qui pousse une grande quantité d'eau plus lentement. Les deux phénomènes ont des caractéristiques et des échelles de temps assez différentes. Dans ce travail, nous supposons que l'explosion est suffisam

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Issa, Mohammad. "Modélisation asymptotique et discrétisation des composants magnétiques dans les problèmes de courant de Foucault." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30177.

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La modèlisation de composants magnétiques intégrés en génie électrique (ex. les transformateurs hautes fréquences) conduit à un certain nombre de problèmes liés à l'augmentation de la fréquence. Cette augmentation de fréquence induit notamment des courants de Foucault dans les pièces conductrices qui nécessitent des maillages très fins et conduit de grands systèmes d'équations et donc souvent à des temps de calcul prohibitifs, notamment pour les structures 3D. Les outils de calcul numérique commerciaux ne répondent que partiellement à ces difficultés, induites notamment par la présence d'entre

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Bird, Gareth Edward. "The coupled dual boundary element-scaled boundary finite element method for efficient fracture mechanics." Thesis, Durham University, 2012. http://etheses.dur.ac.uk/6996/.

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A novel numerical method is presented for applications to general fracture mechanics problems in engineering. The coupled dual boundary element-scaled boundary finite element method (DBE-SBFEM) incorporates the numerical accuracy of the SBFEM and the geometric versatility of the DBEM. Background theory, detailed derivations and literature reviews accompany the extensions made to the methods constituents necessary for their coupling as part of the present work. The coupled DBE-SBFEM, its constituent components and their application to linear elastic fracture mechanics are critically assessed an

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Vu, Thu Hang. "Enhancing the scaled boundary finite element method." University of Western Australia. School of Civil and Resource Engineering, 2006. http://theses.library.uwa.edu.au/adt-WU2006.0068.

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[Truncated abstract] The scaled boundary finite element method is a novel computational method developed by Wolf and Song which reduces partial differential equations to a set of ordinary linear differential equations. The method, which is semi-analytical, is suitable for solving linear elliptic, parabolic and hyperbolic partial differential equations. The method has proved to be very efficient in solving various types of problems, including problems of potential flow and diffusion. The method out performs the finite element method when solving unbounded domain problems and problems involving

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Ritchie, Jeremey Alexander. "The Boundary Element Method in lubrication analysis." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329039.

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Gordon, R. S. "Boundary element method for axisymmetric thermoelastic analysis." Thesis, Cranfield University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.302881.

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Aggarwal, Aditya Mohan. "B-Spline Boundary Element Method for Ships." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/853.

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The development of a three dimensional B-Spline based method, which is suitable for the steady-state potential flow analysis of free surface piercing bodies in hydrodynamics, is presented. The method requires the B-Spline or Non Uniform Rational B-Spline (NURBS) representation of the body as an input. In order to solve for the unknown potential, the source surface, both for the body as well as the free surface, is represented by NURBS surfaces. The method does not require the body surface to be discritized into flat panels. Therefore, instead of a mere panel approximation, the exact body

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Huang, Xiyong. "Probabilistic fracture mechanics by boundary element method." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6192.

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In this work, a new boundary element method is presented for the Probabilistic Fracture Mechanics analysis. The method developed allows the probabilistic analysis of cracked structure accomplished by the dual boundary element method (DBEM), in which the traction integral equation is used on one of the crack faces as opposed to the usual displacement integral equation. The stress intensity factors and their first order derivatives are evaluated for mode-I and mixed-mode fracture problems. A new boundary element formulation is derived and implemented to evaluate the design variables sensitivitie

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Bapat, Milind S. "New Developments in Fast Boundary Element Method." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1331296947.

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Guardasoni, C. "Wave propagation analysis with boundary element method." Doctoral thesis, Università degli Studi di Milano, 2010. http://hdl.handle.net/2434/148439.

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Time-dependent problems, that are frequently modelled by hyperbolic partial differential equations, can be dealt with the boundary integral equations (BIEs) method. The ideal situation is when the partial differential equation is homogeneous with constant coefficients, the initial conditions vanish and the data are given only on the boundary of a domain independent of time. In this situation the transformation of the differential problem to a BIE follows the same well-known method for elliptic boundary value problems. In fact the starting point for a BIE method is the representation of the dif

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Irfanoglu, Bulent. "Boundary Element-finite Element Acoustic Analysis Of Coupled Domains." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605360/index.pdf.

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This thesis studies interactions between coupled acoustic domain(s) and enclosing rigid or elastic boundary. Boundary element-finite element (BE-FE) sound-structure interaction models are developed by coupling frequency domain BE acoustic and FE structural models using linear inviscid acoustic and elasticity theories. Flexibility in analyses is provided by discontinuous triangular and quadrilateral elements in the BE method (BEM), and a rectangular plate and a triangular shell element in the FE method (FEM). An analytical formulation is developed for an extended fundamental sound-struct

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Harbrecht, Helmut, and Reinhold Schneider. "Biorthogonal wavelet bases for the boundary element method." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200601308.

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As shown by Dahmen, Harbrecht and Schneider, the fully discrete wavelet Galerkin scheme for boundary integral equations scales linearly with the number of unknowns without compromising the accuracy of the underlying Galerkin scheme. The supposition is a wavelet basis with a sufficiently large number of vanishing moments. In this paper we present several constructions of appropriate wavelet bases on manifolds based on the biorthogonal spline wavelets of A. Cohen, I. Daubechies and J.-C. Feauveau. By numerical experiments we demonstrate that it is worthwhile to spent effort on their construction

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de, Leon Simon. "The boundary element method for linear acoustic systems." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=18709.

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A technique based on the transient boundary element method for the numerical simulation of three-dimensional linear acoustic systems is presented. Using surface meshes generated by \texttt{Distmesh} \cite{persson:2004}, pressure is extracted from points within the enclosed volume of the mesh by integration of retarded potentials across the boundary. As a result, mesh junction calculations and topology-related inaccuracies within the volume are avoided. For simulations of struck instruments, membrane motion is modeled using two-dimensional digital waveguide techniques adapted for an unstructure

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