A subgrid-scale model for the scalar dissipation rate in nonpremixed combustion

A subgrid-scale model is discussed for the scalar dissipation rate in nonpr emixed turbulent reacting Bows. The model contains a coefficient which is d etermined by assuming a form for the scalar energy spectrum. The model is t ested a priori using Direct Numerical Simulation (DNS) results for a tempor al reacting mixing layer. The estimated dissipation rates an in good agreem ent with dissipation rates computed directly from the DNS data. Furthermore , the assumed spectrum methodology is found to accurately predict the model coefficient, including its spatial and temporal variations. (C) 1999 Ameri can Institute of Physics. [S1070-6631(99)02203-5].