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Influence of computational drop representation in LES of a mixing layer with evaporating drops

Radhakrishnan, Senthilkumaran and Bellan, Josette (2012) Influence of computational drop representation in LES of a mixing layer with evaporating drops. Computers & Fluids, 58 . pp. 15-26. ISSN 0045-7930. http://resolver.caltech.edu/CaltechAUTHORS:20171023-153637928

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Abstract

The objective of this work is to quantify the influence of the number of computational drops and grid spacing on the accuracy of predicted flow statistics and to possibly identify the minimum number, or, if not possible, the optimal number of computational drops that provides minimal error in flow prediction. For this purpose, Large Eddy Simulation (LES) of a mixing layer with evaporating drops has been performed using the dynamic Smagorinsky model and employing various numbers of computational drops. The LES were performed by reducing the number of physical drops by a factor varying from 8 to 128 to obtain the ensemble of computational drops, and by utilizing either a coarse or a fine grid. A set of first order and second order gas-phase statistics as well as drop statistics are extracted from LES predictions and are compared to results obtained by filtering a Direct Numerical Simulation (DNS) database. First order statistics such as Favre averaged streamwise velocity, Favre averaged vapor mass fraction, and the drop streamwise velocity are predicted accurately independent of the number of computational drops and grid spacing. Second order flow statistics depend both on the number of computational drops and on grid spacing. The scalar variance and turbulent vapor flux are predicted accurately by the fine mesh LES only when the computational drop field is reduced by a factor of no more than 32, and by the coarse mesh LES reasonably accurately for all computational drop field values. This is attributed to the fact that when the grid spacing is coarsened, the number of drops in a computational cell must not be significantly lower than that in the DNS.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.compfluid.2011.11.018DOIArticle
http://www.sciencedirect.com/science/article/pii/S004579301100363X?via%3DihubPublisherArticle
Additional Information:© 2011 Elsevier Ltd. Received 26 May 2011, Revised 6 October 2011, Accepted 28 November 2011, Available online 16 December 2011.
Subject Keywords:Large Eddy Simulation; Two-phase flows; Single-component liquid; Mixing layer; LES of evaporating sprays
Record Number:CaltechAUTHORS:20171023-153637928
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20171023-153637928
Official Citation:Senthilkumaran Radhakrishnan, Josette Bellan, Influence of computational drop representation in LES of a mixing layer with evaporating drops, In Computers & Fluids, Volume 58, 2012, Pages 15-26, ISSN 0045-7930, https://doi.org/10.1016/j.compfluid.2011.11.018. (http://www.sciencedirect.com/science/article/pii/S004579301100363X)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:82599
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Oct 2017 20:43
Last Modified:24 Oct 2017 20:43

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