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Two widely used sub-grid scale models, the standard and the dynamicSmagorinsky models were tested in a simulation of the flow in a thermallydriven 3D cavity at Rayleigh number of Ra=1E9. The main focus of the researchis the response of the subgrid scale models to the coarse mesh and theirability to predict the flow in a thermally driven 3D cavity with the meshresolution below generally accepted LES standards. The research is motivated byinvestigating a feasible modeling strategy for the particulate flow in thewall-bounded side-wall heated cavity. As URANS and hybrid RANS-LES models failto produce modeled energy due to laminarization, the alternative is LES appliedon the coarse mesh. In a quantitative manner, first and second-momentstatistics are com-pared against both reference LES and experimental databasesfrom literature. For first moment statistics, both models globally predict theflow field well. However, for higher moments, the dynamic model outperforms thestandard Smagorinsky model using the same mesh resolution. In a qualitativefashion, we report the contours of both temperature and velocity fields as wellas the near-wall turbulent coherent structures. Results of flow quantities areglobally in very good agreement with both reference LES and experimentalmeasurements at a fraction of the CPU power needed for conventional LES.

On sub-grid scale modeling in a differentially heated cavity using coarse large eddy simulation