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Models for the large eddy simulation equations to describe multi-species mixing occuring at supercritical pressure

Borghesi, G. and Bellan, Josette (2014) Models for the large eddy simulation equations to describe multi-species mixing occuring at supercritical pressure. International Journal of Energetic Materials and Chemical Propulsion, 13 (5). pp. 435-453. ISSN 2150-766X . http://resolver.caltech.edu/CaltechAUTHORS:20150211-072315895

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Abstract

An existing database of direct numerical simulations (DNS) representing mixing of species under supercritical pressure (supercritical-ρ) conditions has been investigated for the purpose of understanding the modeling of the gradient of the filtered pressure, the divergence of the filtered heat flux, and the divergence of the filtered species mass flux, all in the context of large eddy simulation (LES). The analysis consists of two separate parts. The activities of all terms appearing in the LES equations are first evaluated, and the dominant terms for each of the transport equations are identified. These data are used to check whether the standard LES assumptions−i.e., that the three above quantities are equal to the gradient of the pressure and the divergences of the fluxes computed from the filtered flow field, respectively−that are routinely used for atmospheric-ρ flows, continue to be valid also in the realm of supercritical-ρ conditions. Having found that these assumptions do not hold under supercritical-ρ conditions, alternative modeling strategies for these terms are proposed, and their accuracy with respect to the standard LES assumptions is assessed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1615/IntJEnergeticMaterialsChemProp.2014011313DOIArticle
http://www.dl.begellhouse.com/journals/17bbb47e377ce023,19ec0e1011f737fc,3bca96226c4f148c.htmlPublisherArticle
Additional Information:© 2014 by Begell House, Inc. This study was conducted at the Jet Propulsion Laboratory (JPL), California Institute of Technology (Caltech), and sponsored al Caltech by the Department of Energy, Basic Energy Sciences under the direction of Dr. W. Sisk and Dr. M. Pederson.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Subject Keywords:large eddy simulations of supercritical-pressure flows, supercritical-pressure multi-species mixing
Record Number:CaltechAUTHORS:20150211-072315895
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150211-072315895
Official Citation:MODELS FOR THE LARGE EDDY SIMULATION EQUATIONS TO DESCRIBE MULTI-SPECIES MIXING OCCURING AT SUPERCRITICAL PRESSURE G. Borghesi, Josette Bellan pages 435-453 DOI: 10.1615/IntJEnergeticMaterialsChemProp.2014011313
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54677
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 Feb 2015 00:56
Last Modified:12 Feb 2015 17:36

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