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Master's Dissertation
DOI
https://doi.org/10.11606/D.55.2022.tde-02022023-154853
Document
Author
Full name
Rameyli Godoi
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2022
Supervisor
Committee
Castelo Filho, Antonio (President)
Bonotto, Everaldo de Mello
Santos, Isaac Pinheiro dos
Souza, Leandro Franco de
Title in Portuguese
Implementação de Modelos Viscoeláticos com Viscosidade Variável no Sistema HiGFlow
Keywords in Portuguese
Carreau-Yasuda
HigFlow
Oldroyd-B
Power law
Viscosidade variavel
Abstract in Portuguese
Essa dissertação apresenta uma metodologia para a simulação de escoamentos onde a viscosidade varia com a taxa de cisalhamento, modelados por duas combinações: a equação constitutiva Oldroyd-B com o modelo de Carreau-Yasuda e Oldroyd-B com o modelo Power law ou lei de potência. Tais simulações foram realizadas no sistema HigFlow e no ambiente de simulação OpenFoam®, onde foram feitos testes para ambas as modelagens num escoamento totalmente desenvolvido entre placas paralelas e em uma contração 4:1. Foram feitos testes variando os números de Reynolds e Deborah, além da verificação da simulação em malhas diferentes. Podese notar que, ao utilizar cinco malhas diferentes, tantos os resultados para τxy e a velocidade em Carreau-Yasuda quanto para Power law apresentam erros relativamente pequenos em comparação com τxx e a viscosidade. Em relação ao número de Reynolds, quanto maior ele for, menores serão os esforços no escoamento. Para o número de Deborah, quanto maior ele for, maiores serão os esforços.
Title in English
Implementation of Viscoelastic Models with Variable Viscosity in the HiGFlow System
Keywords in English
Carreau-Yasuda
HigFlow
Oldroyd-B
Power law
Variable viscosity
Abstract in English
This dissertation presents a methodology for simulating flows where viscosity varies with shear rate, modeled by two combinations: the constitutive equation Oldroyd-B with the Carreau- Yasuda model and Oldroyd-B with the Power law model. Such simulations were performed in the HigFlow system and in the OpenFoam® simulation environment, where tests were performed for both models in a fully developed flow between parallel plates and in a 4:1 contraction. Tests were performed varying the Reynolds and Deborah numbers, in addition to checking the simulation in different meshes. It can be noted that, when using five different meshes, both the results for τxy and the speed in Carreau-Yasuda and for Power law have relatively small errors compared to τxx and the viscosity. In relation to the Reynolds number, the higher it is, the lower the flow forces will be. For Deborahs number, the larger it is, the greater the strains.
 
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Publishing Date
2023-02-02
 
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