An evaluation of the assumed beta probability density function subgrid-scale model for large eddy simulation of nonpremixed, turbulent combustion with heat release

Journal Article · Sun Oct 01 04:00:00 EDT 2000 · Physics of Fluids (1994)

DOI:https://doi.org/10.1063/1.1287911· OSTI ID:20217613

Wall, Clifton ^[1]; Boersma, Bendiks Jan ^[1]; Moin, Parviz ^[1]

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1. Center for Turbulence Research, Stanford University, Stanford, California 94305 (United States)

The assumed beta distribution model for the subgrid-scale probability density function (PDF) of the mixture fraction in large eddy simulation of nonpremixed, turbulent combustion is tested, a priori, for a reacting jet having significant heat release (density ratio of 5). The assumed beta distribution is tested as a model for both the subgrid-scale PDF and the subgrid-scale Favre PDF of the mixture fraction. The beta model is successful in approximating both types of PDF but is slightly more accurate in approximating the normal (non-Favre) PDF. To estimate the subgrid-scale variance of mixture fraction, which is required by the beta model, both a scale similarity model and a dynamic model are used. Predictions using the dynamic model are found to be more accurate. The beta model is used to predict the filtered value of a function chosen to resemble the reaction rate. When no model is used, errors in the predicted value are of the same order as the actual value. The beta model is found to reduce this error by about a factor of two, providing a significant improvement. (c) 2000 American Institute of Physics.

• OSTI ID: 20217613
• Journal Information: Physics of Fluids (1994), Journal Name: Physics of Fluids (1994) Journal Issue: 10 Vol. 12; ISSN 1070-6631; ISSN PHFLE6
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COMBUSTION
COMBUSTION KINETICS
FLUID FLOW
HEAT FLUX
HEAT TRANSFER
JETS
PROBABILITY
SIMULATION
THEORETICAL DATA
TURBULENCE
TURBULENT FLOW