Simulação numérica de grandes escalas de escoamentos turbulentos em cavidades retangulares bidimensionais

• Ano de defesa: 1995
• Autor(a) principal: Pinho, Francisco Aurilo Azevedo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Engenharia Mecânica
• Palavras-chave em Português: Fluidos; Turbulência; Cavidades; Simulação numérica; Simulação de Grandes Escalas; Método MacCormack; Fluids; Turbulence; Cavities; Numerical simulation; Large-Eddy simulation; MacCormack method; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA
• Link de acesso: https://repositorio.ufu.br/handle/123456789/29519; http://doi.org/10.14393/ufu.di.1995.15

In this work, results related to Large-Eddy Numerical Simulation of turbulent flows in rectangular two dimensional cavities are presented. The Smagorinsky turbulence subgrid model is used in the simulation. The discretization method is the MacCormack totally explicit algorithm, for which a chapter is dedicated. Large-Eddy Simulation is treated another chapter. Simulation was carried out for two cases: cavities in ducts and cavities under free flows. In the former, Kelvin—Helmholtz structures are evident which are periodic in time. Their frequencies spectrum is analyzed through Calculation of the pressure spectral density. The energy spectral density is also calculated and showed good agreement with two dimensional turbulent flow theory. The data of the simulation in the cavities under free flows are compared to experimental data available in the literature and presented good agreement in qualitative terms.