Mixing in Isotropic Turbulence with Scalar Injection and Applications to Subgrid Modeling

M. Elmo; A. Moreau; J. P. BertoglioV. A. Sabelnikov

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Mixing in Isotropic Turbulence with Scalar Injection and Applications to Subgrid Modeling

机译：Mixing in Isotropic Turbulence with Scalar Injection and Applications to Subgrid Modeling

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A new technique for injecting scalar fluctuations in a DNS of isotropic turbulence is presented. It is used to study statistically steady states associated with different levels of mixing. The results are analysed in terms of spectra and PDF, and they are used as a data base to investigate the effect of the filtering operation that is performed in LES. It is shown that the PDF of the scalar is substantially affected by the filtering operation. It is also shown that the Cook and Riley 1 subgrid model allows reconstruction of a PDF which is in fairly good agreement with the unfiltered DNS results. The consequences of estimating the scalar subgrid variance by scale similarity assumptions are investigated. It is found that the results are improved by a local determination of the model constant.

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《Flow, turbulence and combustion》 |2000年第2期|113-131|共19页
作者
M. Elmo; A. Moreau; J. P. BertoglioV. A. Sabelnikov;
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作者单位

Laboratoire de Mecanique des Fluides et d'Acoustique, UMR 5509, Ecole Centrale de Lyon, 36 Av. Guy de Collongue, 69130 Ecully, France;

TSAGI, Zhukovsky Moscow Region, 140160, Russia;

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正文语种英语
中图分类力学;
关键词
mixing; turbulence; probability density function; subgrid-scale model;

Mixing in Isotropic Turbulence with Scalar Injection and Applications to Subgrid Modeling

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