A posteriori assessment of algebraic scalar dissipation models for RANS simulation of premixed turbulent combustion

This paper examines the eects of scalar dissipation rate modelling on
mean reaction rate predictions in turbulent premixed
ames. The sensitivity of the
mean reaction rate is explored by using dierent closures for scalar dissipation and the sensitivity of the scalar dissipation models themselves is also examined withrespect to their dening constants. The influence of dierent scalar dissipation
models on the same location and mean velocities is reported and compared with
experimental results. The predicted reaction rate is found to be sensitive to the
choice of closure used for scalar dissipation and also to the respective constants
used in the scalar dissipation models. It is also found that the scalar dissipation models involving chemical and turbulent time scales yield a more physically plausible reaction rate when compared with the scalar dissipation models relying onlyon the turbulent time scale.