Abstract
Current dynamic procedures in large-eddy simulation treat the two subgrid-scale stresses in the Germano identity with the same subgrid base model. Thus to get the base model coefficient, the coefficient must be assumed to be constant for test filter operation. However, since the coefficient has sharp fluctuations, this assumption causes some inconsistence. A new dynamic procedure was developed in which these two stresses are modeled by the base model and the scale-similarity hypotheses respectively. Thus the need for the assumption is removed and consistence is restored. The new procedure is tested in the large-eddy simulation of a lid-driven cavity flow at Reynolds number of 10,000. The results show that the new procedure can both improve the prediction of statistics of the flow and effectively relieve the singularity of subgrid-scale (SGS) model coefficient.
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