A DYNAMIC SIMILARITY MODEL FOR LARGE-EDDY SIMULATION OF TURBULENT COMBUSTION

A dynamic similarity subgrid-scale (SGS) unmixedness model is presente d for large eddy simulation (LES) of turbulent reacting flows. The mod el is assessed both a priori and a posteriori via data obtained by dir ect numerical simulations (DNS) of homogeneous compressible turbulent flows involving a single step Arrhenius reaction. The results of a pri ori analysis indicate that the local values of the SGS unmixedness are accurately predicted by the model. A posteriori results also indicate that the statistics of the resolved temperature and scalars as obtain ed by LES compare favorably with DNS values. (C) 1998 American Institu te of Physics.