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Premixed Turbulent Combustion Models for Large Eddy and RANS Simulations

[+] Author Affiliations
Eike Tangermann, Roman Keppeler, Michael Pfitzner

Universität der Bundeswehr München, Neubiberg, Germany

Paper No. GT2010-22298, pp. 203-212; 10 pages
doi:10.1115/GT2010-22298
From:
  • ASME Turbo Expo 2010: Power for Land, Sea, and Air
  • Volume 2: Combustion, Fuels and Emissions, Parts A and B
  • Glasgow, UK, June 14–18, 2010
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4397-0 | eISBN: 978-0-7918-3872-3
  • Copyright © 2010 by ASME

abstract

Large-Eddy simulation (LES) has become an important tool in computational fluid mechanics but still is far from replacing Reynolds-averaged Navier-Stokes (RANS) approaches. The present work compares combustion models for LES and RANS derived from the same physical assumptions. Thus a direct comparison of results from both approaches for a combusting flow becomes possible. The models are based on the assumption of a fractal shape of the flame surface, leading to the Lindstedt-Vaos model in RANS. Its generalization to LES is presented here. Both RANS and LES models are validated with data from a turbulent Bunsen flame to evaluate their sensitivity to turbulence level and length scale. The predicted turbulent burning velocity shows a very similar behavior in both models. The models are also tested with a second validation configuration, the combusting flow over a backward-facing step. This flow clearly shows the different behavior of RANS and LES methods in unsteady flows containing large coherent turbulent structures.

Copyright © 2010 by ASME

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