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Jiménez Sendín
Javier

Liñán Martínez
Amable

Rogers
Michael M.

Higuera Antón
Francisco
Apriori testing of subgrid models for chemically reacting nonpremixed turbulent shear flows
Standford
byncnd
pub
 quimica
 fisica
public
The [beta]assumedpdf approximation of (Cook & Riley 1994) is tested as a subgrid model for the LES computation of nonpremixed turbulent reacting flows, in the limit of cold infinitely fast chemistry, for two plane turbulent mixing layers with different degrees of intermittency. Excellent results are obtained for the computation of integrals properties such as product mass fraction, and the model is applied to other quantities such as powers of the temperature and the pdf of the scalar itself. Even in these cases the errors are small enough to be useful in practical applications. The analysis is extended to slightly out of equilibrium problems such as the generation of radicals, and formulated in terms of the pdf of the scalar gradients.
It is shown that the conditional gradient distribution is universal in a wide range of cases whose limits are established. Within those limits, engineering approximations
to the radical concentration are also possible. It is argued that the experiments in this paper are essentially in the limit of infinite Reynolds number.
published
1996
Standford
89110
460
Aeronauticos
Motopropulsion
Studying turbulence using numerical simulation databases  VI proceedings of the 1996 Summer Program, Center for Turbulence Research, [June 24 to July 19, 1996]
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