Monday, 31 October 2005 - 1:00 PM
88b
Large-Eddy Simulation of Turbulent Reactive Flows
Venkatramanan Raman, Center for Turbulence Research, Stanford University, 500I Stanford University, Palo Alto, CA 94305 and Heinz Pitsch, Stanford Center for Turbulence Research, Stanford University Building 500, Stanford, CA 94305.
Numerical computation of turbulent reacting flows is a vital tool in the design and analysis of chemical processes. The wide range of length and time scales and their complex interaction that occur in such flows, pose a formidable computational challenge. In the recent past, large-eddy simulation (LES) has emerged as a reliable computational tool for modeling turbulent flows. LES resolves all large-scales of the flow and models the unresolved small scale features which are assumed to be universal in non-reacting turbulent flows. However, fast chemical reactions occur at the smallest length scales and need to be modeled exclusively. In this work, we detail the development of the hybrid LES-filtered-density-function (LES-FDF) approach for the simulation of turbulent reacting flows. LES is a deterministic method while solution to the high-dimensional FDF transport equation requires a Lagrangian Monte-Carlo method. Several modeling and algorithmic issues regarding such coupling are addressed. Using this new algorithm, for the first time, a series of experimental flames are computed with detailed chemistry. Such a rigorous test shows the feasibility, robustness and adaptability of the LES-FDF methodology. Extensions to multi-phase reacting flows are also discussed.
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