Transient Interactive Flamelets with Tabulated Chemistry

Anders Borg, Harry Lehtiniemi, Fabian Mauss

Abstract

Incorporating chemistry and accounting for turbulence-chemistry interactions in Computational Fluid Dynamics (CFD) calculations is challenging. In order to achieve industrially acceptable simulation times, while still accounting for chemistry, and effects of the turbulent flow-field on the chemistry, methods based on transient flamelets and a flamelet progress variable have been proposed. In this work we present a method that facilitates for running a high number of transient flamelets on-line with the CFD code. Our method relies on a progress variable parameterization of the chemistry, where chemical enthalpy is chosen as the progress variable, as suggested in Ref. In the following we outline the modifications to the method proposed in Ref.; discuss the differences between a parameterization employing homogeneous reactor calculations and a parameterization based on transient flamelet calculations; show the applicability of the model in both a stand-alone transient flamelet configuration, and in CFD using a constant volume spray chamber test case. For brevity we do not elaborate further on the flamelet model itself. Instead the reader is referred to Ref. and references therein for further details.