Response of turbulent enstrophy to sudden implementation of spanwise wall oscillation in channel flow

被引：0

作者：

Mingwei GE ^{[1
]}

Guodong JIN ^{[2
]}

机构：

[1] School of Renewable Energy,North China Electric Power University

[2] State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences

来源：

Applied Mathematics and Mechanics(English Edition) | 2017年 / 38卷 / 08期

基金：

中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;

关键词：

turbulent channel flow; transport of enstrophy; drag reduction; spanwise wall oscillation(SWO);

D O I：

暂无

中图分类号：

O357.5 [湍流（紊流）];

学科分类号：

080103 ; 080704 ;

摘要：

The response of turbulent enstrophy to a sudden implementation of spanwise wall oscillation(SWO) is studied in a turbulent channel flow via direct numerical simulation. In the beginning of the application of SWO, a significant correlation is formed between ω′yand ω′z. A transient growth of turbulent enstrophy occurs, which directly enhances turbulent dissipation and drifts the turbulent flow towards a new lower-drag condition. Afterwards, the terms related to the stretching of vorticity(ωx, ω′y, and ωz),the inclination of ω′yby ?w/?y, the turn of z by ?v′/?z, and the horizontal shear of z by ?w′/?x are suppressed due to the presence of SWO, leading to attenuation of the turbulent enstrophy.

引用

页码：1159 / 1170

页数：12

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