A generalized partially stirred reactor model for turbulent closure

A generalized Partially-Stirred Reactor (PaSR) model is presented in this work based on the inclusion of multiple chemical times. The PaSR has shown promising results at modelling turbulence-chemistry interaction Large-Eddy Simulations (LES) and Reynolds-Averaged Navier-Stokes (RANS), providing an extension well-known Eddy Dissipation Concept (EDC). divides computational domain into reactive non-reactive parts. factor defining partition expressed as a function system characteristic mixing However, estimation these factors, particularly one, often oversimplified. approach proposed study seeks to include whole set times involved system. Besides, concept fine structures, first introduced EDC adopted also characterize evolution chemistry part fluid, here abandoned favour direct manipulation species production rates. mean source term formulated according new through modal decomposition Jacobian matrix. method validated priori with DNS data syngas non-premixed jet flame, whose filtered represent validation benchmark. good agreement found between for all different filter widths. Comparison single time scale clearly shows limitations old standard necessity including spectrum more comprehensive description interaction. thorough analysis participation index reveals complexity reaction rates contributions development specific scale, underlying importance developing able inherit kinetic pathways turbulent closure.