Conditional Moment Closure for Turbulent Premixed Flames

Abstract

The conditional moment closure (CMC) is a well-established method for the modelling of turbulent non-premixed combustion, but its suitability when applied to turbulent premixed combustion is still a topic of research. Recently, the method has been improved and implemented with encouraging results. The method is used as a closure for the mean reaction rate, which includes the averaged species transport equation. Unlike the flamelet-based methods, its transport equations are derived with no explicit assumptions about the effect of turbulent vortices on the flame front structure. Hence, the CMC is expected to capture the finite-rate chemistry effects and thus predicts species with slow chemical time scales more efficiently. Most importantly, the method would apply to all regimes in turbulent premixed combustion. In this chapter, the method is described comprehensively along with its numerical implementation and some selected results.