Seventh International Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP7
A NON-EQUILIBRIUM MODEL FOR SCALAR DISSIPATION RATE IN LES OF COMBUSTION
pages 1-6
DOI: 10.1615/TSFP7.300
ABSTRAKT
Modeling of subfilter scalar dissipation rate is critical to accurate simulation of turbulent combustion using large eddy simulation (LES). Non-equilibrium models contain a timescale coefficient bτ that is generally unknown a priori and cannot be determined by conventional dynamic modeling procedures. Here, an alternative dynamic procedure is formulated from the variance transport equation (VTE). The modeling accuracy of the VTE-based dynamic model for bτ is assessed through a priori tests in homogeneous isotropic turbulence and in a planar jet flow. Particular attention is given to the effects of various averaging methods used for coefficient estimation and a novel conditional averaging approach is presented.