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A new formulation of the Large Eddy Simulation composition equations for two-phase fully-multicomponent turbulent flows

Gloor, Michael and Bellan, Josette (2011) A new formulation of the Large Eddy Simulation composition equations for two-phase fully-multicomponent turbulent flows. Computers & Fluids, 50 (1). pp. 94-103. ISSN 0045-7930. http://resolver.caltech.edu/CaltechAUTHORS:20171023-160118408

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Abstract

The Large Eddy Simulation (LES) composition equations for fully multicomponent two-phase flows are here reformulated compared to a previous study in order to palliate modeling issues identified with the previous formulation. These modeling issues were highlighted in an a priori study using a Direct Numerical Simulation (DNS) database of a transitional, compressible, gaseous, temporal mixing layer laden with evaporating fuel drops. The issues consisted of: (1) the dominance of resolved source terms (representing the effect of the drops on the gas) with respect to advection and (2) the important role of subgrid source terms, even when the filter width was moderate with respect to the DNS grid spacing (e.g. factor of 4). The new formulation no longer exhibits the first issue, while the second issue is only present at larger filter widths (e.g. larger than a factor of 8). The capability to model SGS effects other than those resulting from source terms is a priori tested on this new formulation for two different SGS models using the DNS database. Due to more accurate modeling possibilities and improved computational efficiency, the new set of equations is identified as better suited for LES applications.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.compfluid.2011.06.017DOIArticle
http://www.sciencedirect.com/science/article/pii/S0045793011002052?via%3DihubPublisherArticle
Additional Information:© 2011 Elsevier Ltd. Received 18 January 2011, Revised 25 May 2011, Accepted 27 June 2011, Available online 5 July 2011.
Subject Keywords:Large Eddy Simulation; Two-phase flows; Multicomponent; Mixing layer; Fully-multicomponent flows
Record Number:CaltechAUTHORS:20171023-160118408
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171023-160118408
Official Citation:Michael Gloor, Josette Bellan, A new formulation of the Large Eddy Simulation composition equations for two-phase fully-multicomponent turbulent flows, In Computers & Fluids, Volume 50, Issue 1, 2011, Pages 94-103, ISSN 0045-7930, https://doi.org/10.1016/j.compfluid.2011.06.017. (http://www.sciencedirect.com/science/article/pii/S0045793011002052)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82600
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Oct 2017 20:42
Last Modified:24 Oct 2017 20:42

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