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Doctoral Thesis
DOI
https://doi.org/10.11606/T.55.2019.tde-10062019-085350
Document
Author
Full name
Stevens Paz Sanchez
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2019
Supervisor
Committee
Buscaglia, Gustavo Carlos (President)
Ausas, Roberto Federico
Blanco, Pablo Javier
Mangiavacchi, Norberto
Title in English
Finite element methods for multuphase flow in microscales
Keywords in English
Ciliated organisms
Finite elemet method
Fluid-solid interaction
Squirmer model
Abstract in English
This doctoral research project aims the study of finite element methods discretized in dynamic meshes in order to simulate fluid-solid interaction and multiphase flow phenomena, particularly flows involving phenomena that are most significant in microfluidic and biofluidic applications. The equations that model multiphase flow will be treated in an arbitrary Lagrangian-Eulerian framework, when required, with several types of boundary conditions at the interfaces, depending on the nature of the phases. The numerical challenges found in this application range from the correct representation of the interface between fluids, passing through geometric challenges in the maintainability of the computer mesh, to the challenges posed by microscales. Special attention is given to squimer models, by means of a general formulation of the swimming problem as well as the steps to transform a standard fluid-solid model to a squirming model.
Title in Portuguese
Métodos de elementos finitos para escoamentos multifásicos em microescalas
Keywords in Portuguese
Interação fluído-estrutura
Método de elementos finitos
Modelo de squirmer
Organismos ciliados
Abstract in Portuguese
Este projeto de pesquisa de doutorado visa o estudo de métodos de elementos finitos discretizados em malhas dinâmicas, com o objetivo de simular fenómenos de interação fluídoestrutura e escoamentos multifásicos, em especial escoamentos que envolvem aplicações em microfluídica e biofluídica. As equações que modelam escoamentos multifásicos serão tratadas em um referencial lagrangeano-euleriano arbitrário, quando requerido, com differentes tipos de condições de contorno nas interfaces, dependendo da natureza das fases. Os desafios numéricos impostos por esta aplicação vão desde a correta representação das interfaces, passando por desafios geométricos na manutenibilidade da malha computacional, até os desafios impostos pelas escalas microscópicas. Atenção especial é dada aos modelos de squimer, por meio de uma formulação geral do problema de natação, bem como os passos para transformar um modelo fluido-sólido padrão em um modelo de squirming.
 
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Publishing Date
2019-06-10
 
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