CUED Publications database

Reynolds number effects on scalar dissipation rate transport and its modeling in turbulent premixed combustion

Chakraborty, N and Swaminathan, N (2013) Reynolds number effects on scalar dissipation rate transport and its modeling in turbulent premixed combustion. Combustion Science and Technology, 185. pp. 676-709. ISSN 0010-2202

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Abstract

The effects of turbulent Reynolds number, Ret, on the transport of scalar dissipation rate of reaction progress variable in the context of Reynolds averaged Navier-Stokes simulations have been analyzed using three-dimensional simplified chemistry-based direct numerical simulation (DNS) data of freely propagating turbulent premixed flames with different values of Ret. Scaling arguments have been used to explain the effects of Ret on the turbulent transport, scalar-turbulence interaction, and the combined reaction and molecular dissipation terms. Suitable modifications to the models for these terms have been proposed to account for Ret effects, and the model parameters include explicit Ret dependence. These expressions approach expected asymptotic limits for large values of Ret. However, turbulent Reynolds number Ret does not seem to have any major effects on the modeling of the term arising from density variation. Copyright © Taylor and Francis Group, LLC.

Item Type: Article
Uncontrolled Keywords: Direct numerical simulations Reynolds averaged Navier-Stokes simulation Scalar dissipation rate Transport equation based closure Turbulent Reynolds number
Subjects: UNSPECIFIED
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:23
Last Modified: 08 Dec 2014 02:09
DOI: 10.1080/00102202.2012.741635