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LES OF TURBULENCE MODULATION IN DIFFUSION FLAMES

Bernard J. Geurts
Multiscale Modeling and Simulation, J.M. Burgers Center, Faculty EEMCS, University of Twente, 7500 AE Enschede, The Netherlands Anisotropic Turbulence, Fluid Dynamics Laboratory, Department of Applied Physics, Eindhoven University of Technology

Rob J. M. Bastiaans
Eindhoven University of Technology, Biomass Research Institute Eindhoven (BRIE)/Department of Mechanical Engineering, P.O. Box 513, 5600 MB Eindhoven, The Netherlands

Abstract

We analyze the evolution of a diffusion flame in a turbulent mixing layer using large-eddy simulation. The large-eddy simulation includes Leray regularization of the convective transport and approximate inverse filtering to represent the chemical source terms. Attention is focused on the interaction between turbulence and combustion. The Leray model is compared to the more conventional dynamic mixed model, concentrating on the kinetic energy decay, the spectrum and the mixing rate.