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Analysis and modeling of subgrid scalar mixing using numerical dataDirect numerical simulations (DNS) of passive scalar mixing in isotropic turbulence is used to study, analyze and, subsequently, model the role of small (subgrid) scales in the mixing process. In particular, we attempt to model the dissipation of the large scale (supergrid) scalar fluctuations caused by the subgrid scales by decomposing it into two parts: (1) the effect due to the interaction among the subgrid scales; and (2) the effect due to interaction between the supergrid and the subgrid scales. Model comparisons with DNS data show good agreement. This model is expected to be useful in the large eddy simulations of scalar mixing and reaction.
Document ID
19950025557
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Girimaji, Sharath S. (Institute for Computer Applications in Science and Engineering Hampton, VA, United States)
Zhou, YE (Institute for Computer Applications in Science and Engineering Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-198169
NAS 1.26:198169
ICASE-95-44
Accession Number
95N31978
Funding Number(s)
CONTRACT_GRANT: NAS1-19480
PROJECT: RTOP 505-90-52-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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