Lb Simulation on Combustion with Turbulence

In this study, we simulate combustion field by the lattice Boltzmann method. We use a compressible model to describe the behavior of a turbulent non-premixed flame in the mixing layer of two co-flowing streams, one of propane and the other of air. By the assumption of fast-chemistry and unity Lewis number, we adopt the conserved scalar approach to reduce computational costs. In this case, the instantaneous chemical composition of the mixture at a given spatial location is at chemical equilibrium. This is so-called laminar flamelet model where the temperature and concentration are obtained by mixture fraction, which is determined by the degree of mixing of fuel and oxidizer. Results show that a thin flame zone separates two fluids of fuel and oxidizer, and the interaction between flame and a vortex pair is observed.