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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2016.tde-12122016-154218
Document
Author
Full name
Gabriela Aparecida dos Reis
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2016
Supervisor
Committee
Cuminato, José Alberto (President)
Rodriguez, Oscar Mauricio Hernandez
Silvestrini, Jorge Hugo
Souza, Francisco José de
Souza, Leandro Franco de
Title in Portuguese
Estudo de métodos de interface imersa para as equações de Navier-Stokes
Keywords in Portuguese
Diferenças finitas compactas
Equações de Navier-Stokes
Equações de Stokes
Métodos de alta ordem
Métodos de interface imersa
Métodos de projeção
Abstract in Portuguese
Uma grande limitação dos métodos de diferenças finitas é que eles estão restritos a malhas e domínios retangulares. Para descrever escoamentos em domínios complexos, como, por exemplo, problemas com superfícies livres, faz-se necessário o uso de técnicas acessórias. O método de interfaces imersas é uma dessas técnicas. Nesse trabalho, primeiramente foi desenvolvido um método de projeção, totalmente livre de pressão, para as equações de Navier-Stokes com variáveis primitivas em malha deslocada. Esse método é baseado em diferenças finitas compactas, possuindo segunda ordem temporal e quarta ordem espacial. Esse método foi combinado com o método de interface imersa de Linnick e Fasel [2] para resolver numericamente as equações de Stokes com quarta ordem de precisão. A verificação do código foi feita por meio do método das soluções manufaturadas e da comparação com resultados de outros autores em problemas clássicos da literatura.
Title in English
Study of immersed interface methods for the Navier-Stokes equations
Keywords in English
Compact finite differences
High-order methods
Immersed interface methods
Methods
Navier-Stokes equations
Stokes equations
Abstract in English
A great limitation of finite differences methods is that they are restricted to retangular meshes and domains. In order to describe flows in complex domains, e.g. free surface problems, it is necessary to use accessory techniques. The immersed interface method is one of such techniques. In the present work, firstly, a projection method was developed, which is completely pressure-free, for the Navier-Stokes equations with primitive variables in a staggered mesh. This method is based on compact finite differences, with temporal second-order precision and spatial foruth-order precision. This method was combined with the immersed interface method from Linnick e Fasel [2] in order to numerically solve the Stokes equations with fourth-order precision. The verification of the code was performed with the manufactured solutions method and by comparing results with other authors for some classical problems in the literature.
 
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Publishing Date
2016-12-12
 
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