Evaluation of a Vortex-based Subgrid Stress Model Using Dns Databases

The performance of a subgrid stress SGS model for large eddy simulation LES developed by Misra Pullin is studied for forced and decaying isotropic turbulence on a grid The physical viability of the model assumptions are tested using DNS databases The results from LES of forced turbulence at Tay lor Reynolds number R are compared with ltered DNS elds Probability density functions pdfs of the subgrid energy transfer total dissipation and the stretch of the subgrid vorticity by the resolved velocity gradient tensor show rea sonable agreement with the DNS data The model is also tested in LES of decaying isotropic turbulence where it correctly predicts the decay rate and energy spectra measured by Comte Bellot Corrsin