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Abstract: Large-eddy simulations of the turbulent flow in a lid-driven cubical cavityhave been carried out at a Reynolds number of 12000 using spectral elementmethods. Two distinct subgrid-scales models, namely a dynamic Smagorinsky modeland a dynamic mixed model, have been both implemented and used to performlong-lasting simulations required by the relevant time scales of the flow. Allfiltering levels make use of explicit filters applied in the physical space onan element-by-element approach and spectral modal spaces. The twosubgrid-scales models are validated and compared to available experimental andnumerical reference results, showing very good agreement. Specific features oflid-driven cavity flow in the turbulent regime, such as inhomogeneity ofturbulence, turbulence production near the downstream corner eddy, small-scaleslocalization and helical properties are investigated and discussed in thelarge-eddy simulation framework. Time histories of quantities such as the totalenergy, total turbulent kinetic energy or helicity exhibit different evolutionsbut only after a relatively long transient period. However, the average valuesremain extremely close.



Autor: Roland Bouffanais, Michel O. Deville, Emmanuel Leriche

Fuente: https://arxiv.org/







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