Numerical simulation of laminar reacting flows with complex chemistry

We present an adaptive algorithm for low Mach number reacting flows with co mplex chemistry. Our approach uses a form of the low Mach number equations that discretely conserves both mass and energy. The discretization methodol ogy is based on a robust projection formulation that accommodates large den sity contrasts. The algorithm uses an operator-split treatment of stiff rea ction terms and includes effects of differential diffusion. The basic compu tational approach is embedded in an adaptive projection framework that uses structured hierarchical grids with subcycling in time that preserves the d iscrete conservation properties of the underlying single-grid algorithm. We present numerical examples illustrating the performance of the method on b oth premixed and non-premixed dames.