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Master's Dissertation
DOI
https://doi.org/10.11606/D.3.2013.tde-26062014-110754
Document
Author
Full name
Saulo Ferreira Maciel
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2013
Supervisor
Committee
Carmo, Bruno Souza (President)
Bistafa, Sylvio Reynaldo
Bittencourt, Marco Lucio
Title in Portuguese
Desenvolvimento de ferramenta computacional de alta ordem para a solução de problemas de propagação acústica.
Keywords in Portuguese
Aeroacústica
Equação de Euler linearizada
Galerkin descontínuo
Abstract in Portuguese
O desenvolvimento de uma ferramenta de Dinâmica de Fluidos Computacional que utiliza Método de Elementos Finitos baseada na discretização de Galerkin descontínuo é apresentado neste trabalho com objetivo de resolver a equação de Euler linearizada para escoamento compressível em duas dimensões usando malhas estruturadas e não estruturadas. Procuramos utilizar esta ferramenta como um propagador de ondas sonoras para estudar fenômenos aeroacústicos. O problema de Riemann presente no fluxo convectivo da equação de Euler é tratado com um método upwind HLL e para o avanço da solução no tempo é usado o método de Runge-Kutta explícito de 4 estágios com segunda ordem de precisão. A eficiência computacional, a convergência do método e a precisão são testadas através de simulações de escoamentos já apresentadas na literatura. A taxa de convergência para altas ordens de aproximação é assintótica que é um resultado compatível com a formulação Galerkin descontínuo.
Title in English
Development of a high-order computational tool for solving acoustic propagation problems
Keywords in English
Aeroacoustics
Discontinuous Galerkin
Linearized Euler equation
Abstract in English
The development of a Computation Fluid Dynamic Tool based on the Finite Element Method with discontinuous Galerkin discretization is presented in this work. The aim of this study is to solve the compressible linearized Euler's equation in two dimensions on structured and non structured meshes. This tool has been used as a means to study aeroacoustics phenomena. The Riemann's problem presented on a convective flow in Euler's equation is tackled by a HLL's method and the time integration being used is the four-stage Runge-Kutta explicit method with second order of accuracy. The computational efficiency, the convergence of the method and the accuracy are tested by comparing our results for flow simulations with those that are available in the literature. The convergence rate to high approximation order is asymptotic and it shows a result which is compatible with a discontinuous Galerkin formulation.
 
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Publishing Date
2014-07-02
 
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