Parallel Adaptive Mesh Refinment Scheme with Presumed Conditional Moment and FPI Tabulated Chemistry for Turbulent Non-Premixed Combustion

摘要

A parallel, Adaptive Mesh Refinement (AMR), finite-volume scheme is combined with a Presumed Conditional Moment (PCM) and Flame Prolongation of ILDM (FPI) tabulated chemistry approach for solution of the Favre-Averaged Navier-Stokes (FANS) equations governing two-dimensional turbulent non-premixed reactive flows of compressible mixtures. The FPI method is an effective and computationally efficient approach for incorporating the effects of the detailed-chemistry on the local flow field for adiabatic laminar flows using two independent scalars: the mixture fraction and progress variable. The effects of turbulence on the mean chemistry is incorporated using a PCM approach based on /3 probability density functions which depend on the two scalars and their variances. A two-equation k-ω turbulence model is used for modelling the effects of the unresolved turbulence on the mean flow field. The governing partial-differential equations are solved using a fully-coupled finite-volume formulation on body-fitted, multi-block, quadrilateral mesh. Two different approaches for coupling the PCM-FPI approach with the parallel AMR finite-volume solution method are considered. The PCM-FPI results are compared to results obtained using a simplified Eddy Dissipation Model (EDM), as well as to experimental data, for both reacting and non-reacting flows associated with a bluff-body burner configuration. A full description of the proposed numerical solution scheme for turbulent non-premixed flames is provided along with an evaluation and demonstration of its computational performance and predictive capabilities.