Abstract
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
Highlights
Problems with fluid and thermal flows are found in several engineering areas
Numerous parameters (field of velocities, mean local Nusselt number, (NuD), global Nusselt number (Nug), drag coefficient (CD) and Strouhal number (St)) were used to determine the level of refinement and the strategy with the highest potential to be used with more complex geometries and at the same time keep the computational requirements at levels not prohibitive for future researches
We tried to make a fair comparison respecting the different size of meshes, but analyzing the behavior of the solution
Summary
Problems with fluid and thermal flows are found in several engineering areas. One of the most studied topics is precisely the phenomena that occur with tubes, bluff bodies and finned channels in cross flow (commonly found, for example, in heat exchangers). Most engineering problems with real application fall within the field of turbulent flow regimes (WILCOX, 2006). From the electronic component cooling system to automotive cooling systems and industrial thermal equipments, the flow regime employed is often turbulent. This is due to the need for a large thermal exchange in these equipments, requiring large momentum of the refrigerant fluid
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