MESHING STRATEGY EVALUATION FOR A SQUARE SHAPED BLUFF BODY UNDER HIGH REYNOLDS NUMBER CROSS FLOW

Filipe Branco Teixeira, Andrei Luís Garcia Santos, Luiz Alberto Oliveira Rocha, Liércio André Isoldi, Elizaldo Domingues dos Santos

Resumo


This work consists in the numerical evaluation of meshes employed in a two-dimensional, incompressible, and transient flow, with high Reynolds numbers and forced convection that passes through a square shaped bluff body. The objective of the study is to evaluate different strategies of mesh construction to solve this type of problem, seeking to reduce the computational cost and improve the solution. The simulations were performed for Reynolds and Prandtl numbers of ReD = 22,000 and Pr = 0.71. The turbulence behavior is solved with the RANS SST–k-w model. The evaluation of the solutions is performed analyzing the drag coefficient (CD), Nusselt number (NuD) and Strouhal number (St). The use of an unstructured mesh with fully structured local refinement was able to validate the fluid dynamics of the case with a relative deviation of 14.95% for the velocity field, compared to the literature. The deviations for CD and St were as low as 0.43% and 0.79% respectively. For thermal verification, the deviation of the mean local Nusselt number along the bluff body (NuD) was 5.93%, and the deviation for the global Nusselt number (Nug) was as low as 0.56% compared to the literature

Palavras-chave


High Reynolds number, Turbulence, Convection, Bluff body, CFD

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DOI: http://dx.doi.org/10.21575/25254782rmetg2018vol3n2530

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Direitos autorais 2018 Filipe Branco Teixeira

Revista Mundi Engenharia, Tecnologia e Gestão ISSN 2525-4782

Qualis: B4 - Interdisciplinar, B5 - Geografia, B5 - Administração Pública e de Empresas, Ciências Contábeis e Turismo, B5 - Comunicação e Informação, B5 - Engenharias III

 

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