Relevant bibliographies by topics / Boundary Element Method (BEM) program / Dissertations / Theses
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Dissertations / Theses on the topic 'Boundary Element Method (BEM) program'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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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

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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4

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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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

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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7

Brown, Steven Andrew. "Development of a coupled finite element - boundary element program for a microcomputer." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45713.

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This thesis describes the development of a coupled finite element — boundary element program for a microcomputer. The steps outlined in the thesis include the adaptation of a mainframe—based boundary element code for use on a microcomputer, the Verification of this program with sample problems, the development of an algorithm for coupling the Finite Element Method to the Boundary Element Method, the implementation of the coupling algorithm with finite element and boundary element codes, including the development of a Constant Strain Triangular finite element, and the Verification of the coupl
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8

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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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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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

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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12

Obršlík, Petr. "Modelování a statická analýza stropní konstrukce v programu ANSYS." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226805.

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This thesis mainly deals with modeling and static analysis of the ceiling structure in the basic environment of ANSYS. The first part is focused on verifying correctness of the model most stressed parts of the structure with a simple hand-static calculation by the process of stress on a continuous beam. The main part is devoted to modeling composite structure, element types, specifying loads and boundary conditions by ANSYS FEM program. In the end, there are the results of stress and deflection presented, and the structure is evaluated at the ultimate limit state and serviceability limit state
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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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14

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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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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16

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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17

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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18

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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19

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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20

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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21

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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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

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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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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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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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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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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31

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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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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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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Watts, Gregory R., D. C. Hothershall, and Kirill V. Horoshenkov. "Measured and predicted acoustic performance of vertically louvred noise barriers." 2001. http://hdl.handle.net/10454/3546.

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No<br>The paper describes model testing of the acoustic performance of vertically louvred and the corresponding predicted performance using a modified Boundary Element Method (BEM) program. The program was developed in a previous phase of the Transport Research Laboratory's research into the performance of modified barriers. Measurements on 1/20th scale model barriers were carried out in a semi-anechoic chamber designed primarily for scale model experiments to investigate outdoor sound propagation under controlled conditions. It was concluded from measurements in the scale model facility that
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35

Morshed, Mir Md Maruf. "Investigation of external acoustic loadings on a launch vehicle fairing during lift-off." 2008. http://hdl.handle.net/2440/50960.

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During the lift-off of a launch vehicle, the acoustic pressure fluctuations caused by the engine exhaust gases produce high noise levels inside the cavity of the fairing and can damage the payload inside the fairing. Hence reducing the noise transmitted into the payload bay is an important area of research. Work presented in this thesis investigates the external acoustic pressure excitations on the fairing of a launch vehicle during the lift-off acoustic environment. In particular, it investigates the external sound pressure levels in the low frequency range from 50Hz to 400Hz, on the fairing
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36

Kirana, Kumara P. "Studies On The Viability Of The Boundary Element Method For The Real-Time Simulation Of Biological Organs." Thesis, 2016. http://etd.iisc.ernet.in/handle/2005/2553.

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Realistic and real-time computational simulation of biological organs (e.g., human kidneys, human liver) is a necessity when one tries to build a quality surgical simulator that can simulate surgical procedures involving these organs. Currently deformable models, spring-mass models, or finite element models are widely used to achieve the realistic simulations and/or the real-time performance. It is widely agreed that continuum mechanics based numerical techniques are preferred over deformable models or spring-mass models, but those techniques are computationally expensive and hence the higher
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37

Sharma, Abhinav master of science in civil engineering. "Numerical modeling of a hydrofoil or a marine propeller undergoing unsteady motion via a panel method and RANS." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4830.

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A computational approach to analyze the hydrodynamic performance of a hydrofoil or a marine propeller undergoing unsteady motion has been developed. In order to simulate heave and pitch motion of a hydrofoil, an unsteady boundary element method based modeling is performed. The wake of the hydrofoil is modeled by a continuous dipole sheet and determined in time by applying a force-free condition on its surface. An explicit vortex core model is adapted in this model to capture the rolling up shape and to avoid instability due to roll-up deformation of the wake. The numerical results of the devel
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Καρλής, Γεράσιμος. "BEM solutions for linear elastic and fracture mechanics problems with microstructural effects." Thesis, 2009. http://nemertes.lis.upatras.gr/jspui/handle/10889/2236.

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During this thesis, a Boundary Element Method (BEM) has been developed for the solution of static linear elastic problems with microstructural effects in two (2D) and three dimensions (3D).The second simplified form of Mindlin's Generalized Gradient Elasticity Theory (Mindlin's Form II)has been employed. The fundamental solution of the 4th order partial differential equation, that describes the aforementioned theory, has been derived and the integral equations that govern Mindlin's Form II Gradient Elasticity Theory have been obtained. Furthermore, a BEM formulation has been developed and spec
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Prakash, Rahul. "Analysis Of Electromagnetic Pulse Simulators." Thesis, 2007. http://hdl.handle.net/2005/493.

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Electromagnetic pulse simulators are essential for testing the ability of electronic devices to withstand high intensity electromagnetic ends. This work presents the analysis of various parallel plate transmission lines used in electromagnetic pulse simulators. Numerical techniques are developed to obtain the characteristic impedance, field map, and cut-infrequencies for the higher order modes of these transmission lines as exact analytical methods are not available for the determination of these quantities. The field map and characteristic impedance are computed using both finite element meth
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Nimmala, Seshu B. "An efficient high-performance computing based three-dimensional numerical wave basin model for the design of fluid-structure interaction experiments." Thesis, 2010. http://hdl.handle.net/1957/18829.

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Fluid-structure interaction (FSI) is an interesting and challenging interdisciplinary area comprised of fields such as engineering- fluids/structures/solids, computational science, and mathematics. FSI has several practical engineering applications such as the design of coastal infrastructure (such as bridges, levees) subjected to harsh environments from natural forces such as tsunamis, storm surges, etc. Development of accurate input conditions to more detailed and complex models involving flexible structures in a fluid domain is an important requirement for the solution of such problems. FSI
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Subramanyan, E. K. Ganapathy. "Escape Of High Mass Ions Due To Initial Thermal Energy And Its Implications For RF Trap Design." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/2015.

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This thesis investigates the loss of high mass ions due to the initial thermal energy in ion trap mass analyzers. It provides an analytical expression for estimating the percentage loss of ions of a given mass at a particular temperature, in a trap operating with a set of conditions. The investigations have been carried out on quadrupole and cylindrical ion trap geometries. The three-dimensional Maxwellian velocity distribution function has been assumed to derive an expression for the percentage of ions lost. Adopting an approximation based on the observed escape velocity profiles of ions, an
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Parreira, Ricardo Jorge Patraquim Godinho. "Difusores acústicos 3D com forma orgânica: estudo numérico e optimização." Doctoral thesis, 2019. http://hdl.handle.net/10316/87633.

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Tese de Doutoramento em Engenharia Civil, no ramo de Construções, apresentada ao Departamento de Engenharia Civil da Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>Os difusores acústicos são correntemente utilizados no condicionamento acústico de espaços com maiores exigências acústicas (estúdios, salas de espectáculos, etc.), servindo, sobretudo, para garantir uma acústica adequada, sem absorções excessivas e espalhando o som mais uniformemente pela sala, eliminando ao mesmo tempo defeitos acústicos como ecos ou zonas sombra. Apesar da optimização de difusores ser um tema d
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