A priori testing of subgrid models for chemically reacting non-premixed turbulent shear flows

Jiménez Sendín, Javier and Liñán Martínez, Amable and Rogers, Michael M. and Higuera Antón, Francisco (1997). A priori testing of subgrid models for chemically reacting non-premixed turbulent shear flows. "Journal of Fluid Mechanics", v. 349 ; pp. 149-171. ISSN 0022-1120.

Description

Title: A priori testing of subgrid models for chemically reacting non-premixed turbulent shear flows
Author/s:
  • Jiménez Sendín, Javier
  • Liñán Martínez, Amable
  • Rogers, Michael M.
  • Higuera Antón, Francisco
Item Type: Article
Título de Revista/Publicación: Journal of Fluid Mechanics
Date: 1997
Volume: 349
Subjects:
Freetext Keywords: chemically reactive flow; probability; shear turbulence; a priori testing; subgrid models; chemically reacting nonpremixed turbulent shear flows; beta assumed probability density function approximation; nonpremixed turbulent reacting flows; infinitely fast chemistry; plane constant density turbulent mixing layers; intermittency; plane averaged properties; product mass fractions; radical generation; mixture fraction; conditional gradient distribution;
Faculty: E.T.S.I. Aeronáuticos (UPM)
Department: Motopropulsión y Termofluidodinámica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The beta-assumed-p.d.f. approximation of Cook and Riley (1994) is tested as a subgrid model for the LES computation of non-premixed turbulent reacting flows, in the limit of infinitely fast chemistry, for two plane constant-density turbulent mixing layers with different degrees of intermittency. Excellent results are obtained in the computation of plane-averaged properties, such as product mass fractions and relatively high powers of the temperature, and even of the p.d.f. of the conserved scalar itself. In all 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 p.d.f. of the gradient of the mixture fraction. It is shown that the form of 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 already in the limit of high Reynolds numbers.

More information

Item ID: 857
DC Identifier: http://oa.upm.es/857/
OAI Identifier: oai:oa.upm.es:857
Official URL: http://journals.cambridge.org/action/displayJournal?jid=FLM
Deposited by: Archivo Digital UPM
Deposited on: 26 Mar 2008
Last Modified: 20 Apr 2016 06:34
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