Modeling of filtered heat release for large eddy simulation of compressible infinitely fast reacting flows
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Tipus de documentArticle
Data publicació2007-01-01
Condicions d'accésAccés restringit per política de l'editorial
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Abstract
A priori and a posteriori studies for large eddy simulation of the compressible turbulent infinitely fast
reacting shear layer are presented. The filtered heat release appearing in the energy equation is unclosed
and the accuracy of different models for the filtered scalar dissipation rate and the conditional filtered scalar dissipation rate of the mixture fraction in closing this term is analyzed. The effect of different closures of
the subgrid transport of momentum, energy and scalars on the modeling of the filtered heat release via the
resolved fields is also considered. Three explicit models of these subgrid fluxes are explored, each with an
increasing level of reconstruction and all of them regularized by a Smagorinsky-type term. It is observed
that a major part of the error in the prediction of the conditional filtered scalar dissipation comes from the
unsatisfactory modeling of the filtered dissipation itself. The error can be substantial in the turbulent fluctuation (rms) of the dissipation fields. It is encouraging that all models give good predictions of the mean
and rms density in a posteriori LES of this flow with realistic heat release corresponding to large density
change. Although a posteriori results show a small sensitivity to subgrid modeling errors in the current
problem, extinction–reignition phenomena involving finite-rate chemistry would demand more accurate
modeling of the dissipation rates. A posteriori results also show that the resolved fields obtained with
the approximate reconstruction using moments (ARM) agree better with the filtered direct numerical simulation since the level of reconstruction in the modeled subfilter fluxes is increased.
CitacióMellado, J. P.; Friedrich, R.; Sarkar, S. Modeling of filtered heat release for large eddy simulation of compressible infinitely fast reacting flows. "Proceedings of the Combustion Institute", 1 Gener 2007, vol. 31, p. 1691-1699.
ISSN1540-7489
Versió de l'editorhttps://www.sciencedirect.com/science/article/pii/S1540748906000708
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