MASS-FLUX-BASED IMPLICIT MULTIGRID METHOD FOR MODELING MULTIDIMENSIONAL COMBUSTION

A highly accurate and efficient method for modeling three-dimensional reacting flows with detailed chemistry is described in this paper, A m ass-flux-based governing system is developed for general curvilinear c oordinates to obtain compactness of the discretization stencil. The mo mentum equations are represented by a set of equations of mass fluxes across cell interfaces, which are discretized by using staggered grid techniques, A third-order monotone upwind-biased scheme is used for al l of the convection terms in the flow equations and species equations to minimize numerical diffusion and capture the sharp gradients existi ng in flames, The governing equations are divided into a chemical reac tion part and a fluid now part, and they are solved in a semicoupled w ay, An implicit semicoarsening multigrid method combined with a line-d istributive relaxation is used as the how solver, The species equation s are discretized by an implicit method and solved in a fully coupled way, Computational results for a confined coflowing diffusion name sho w good agreement with experimental data, A detailed three-dimensional calculation of combustion in a gas-turbine combustor with strong swirl ing inflows is also presented.