Influence of vorticity alignment upon scalar gradient production in three-dimensional, isotropic turbulence

被引：2
作者：
Gonzalez, M. [1 ]
Paranthoen, P. [1 ]
机构：
[1] CNRS, UMR 6614, CORIA, F-76801 St Etienne, France
来源：
13TH EUROPEAN TURBULENCE CONFERENCE (ETC13): PARTICLES IN TURBULENCE, TRANSPORT PROCESSES AND MIXING | 2011年 / 318卷
关键词：
LAGRANGIAN DYNAMICS; PASSIVE SCALAR; STATISTICS; VELOCITY; FLOWS;
D O I：
10.1088/1742-6596/318/5/052041
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
We use a stochastic Lagrangian model to investigate how the mechanisms of scalar gradient production may be affected by alignments of vorticity with respect to strain principal axes. The most intense scalar gradient production occurs when vorticity aligns with the 'intermediate' strain eigenvector. Mean production conditioned on vorticity aligning with the extensional eigenvector is closer to mean production in the total flow. These differences are explained by the special statistics of both strain eigenvalues and scalar gradient alignment when vorticity aligns with a strain eigenvector.
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页数：7
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