MODELOS DE TURBULÊNCIA APLICADOS PROBLEMAS CLÁSSICOS DE MECÂNICA DOS FLUIDOS E TRANSFERÊNCIA DE CALOR - A AVALIAÇÃO DO DESEMPENHO DO PACOTE DE DFC DE CÓDIGO ABERTO OPENFOAM
DOI:
https://doi.org/10.47820/acertte.v1i5.39Palavras-chave:
Tópicos relacionados à modelagem de escoamentosResumo
Tópicos relacionados à modelagem de escoamentos turbulentos apresentam relevância significativa em diversas áreas, principalmente nas engenharias, uma vez que a grande maioria dos escoamentos presentes em projetos de dispositivos e sistemas são caracterizados como turbulentos. Uma ferramenta amplamente aplicada para a análise de tais fluxos é o uso de simulações numéricas baseadas em modelos de turbulência. Assim, este trabalho tem como objetivo avaliar o desempenho de diversos modelos de turbulência quando aplicados a problemas clássicos de mecânica dos fluidos e transferência de calor, já amplamente validados por procedimentos empíricos. Foi utilizado o software open source OpenFOAM, altamente adequado para a obtenção de soluções numéricas para problemas de mecânica dos fluidos envolvendo geometrias complexas. Os problemas de avaliação dos modelos de turbulência selecionados foram: cavidade bidimensional, Pitz-Daily, fluxo de ar sobre um aerofólio, fluxo de ar sobre o corpo rombudo de Ahmed e o problema da convecção natural entre placas paralelas. A solução para tais problemas foi alcançada utilizando vários modelos de turbulência de Equações Médias de Reynolds (RANS), a saber: k-ε, k-ω, Lam-Bremhorst k-ε, k-ω SST, Lien-Leschziner k-ε, Spalart- Allmaras, Launder-Sharma k-ε, grupo de renormalização (RNG) k-ε. Os resultados obtidos foram comparados com os encontrados na literatura os quais foram obtidos empiricamente, permitindo avaliar os pontos fortes e fracos da modelagem de turbulência aplicada em cada problema.
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