A Timescale-Augmented Spalart-Allmaras Turbulence Model for Flamelet Combustion Applications

Kurzfassung

Flamelet combustion models cannot be used in combination with one-equation turbulence models, e.g. the classical Spalart-Allmaras model, because they require an explicit value for the turbulent time scale. As this can be avoided for Large-Eddy simulations, Reynolds-averaged Navier-Stokes simulations and Detached-Eddy simulations rely on an explicit transport equation for the turbulent time scale. This work extends the Spalart-Allmaras turbulence model by a transport equation for the specific dissipation rate borrowed from an earlier version of the Wilcox k-omega model. The new model is tested in simulations of a generic 2D test case and two model combustion chambers.