EFFECT OF SWEEP AND EJECTION EVENTS ON PARTICLE DISPE- RSION IN WALL BOUNDED TURBULENT FLOWS

This paper studies the sweep and ejection events in a channel flow with Reτ = 80 by using Direct Numerical Simulation （DNS）. The effects of ejection and sweep events on the transport of fluid particles are analyzed separately through a quadrant technique. By analyzing trajectories of the particles r...

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Published in水动力学研究与进展：英文版 Vol. 24; no. 5; pp. 794 - 799
Main Author LUO Jian-ping LU Zhi-ming QIU Xiang LI Dong-mei LIU Yu-lu
Format Journal Article
LanguageEnglish
Published 2012
Subjects
Lagrangian
事件
喷发
扫描
持续时间
湍流
直接数值模拟
粒子
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Summary:This paper studies the sweep and ejection events in a channel flow with Reτ = 80 by using Direct Numerical Simulation （DNS）. The effects of ejection and sweep events on the transport of fluid particles are analyzed separately through a quadrant technique. By analyzing trajectories of the particles released at different wall-normal locations, it is found that the particles from the ejection events mainly move upward while the particles from the sweep events move downward of the flow during short and intermediate diffusion time durations. Numerical results show that the effects of the ejection and sweep events on the mean displacement and the mean square dispersion remain for a long time, one-order of magnitude larger than the streamwise Lagrangian integral ~cales.
Bibliography:31-1563/T
This paper studies the sweep and ejection events in a channel flow with Reτ = 80 by using Direct Numerical Simulation （DNS）. The effects of ejection and sweep events on the transport of fluid particles are analyzed separately through a quadrant technique. By analyzing trajectories of the particles released at different wall-normal locations, it is found that the particles from the ejection events mainly move upward while the particles from the sweep events move downward of the flow during short and intermediate diffusion time durations. Numerical results show that the effects of the ejection and sweep events on the mean displacement and the mean square dispersion remain for a long time, one-order of magnitude larger than the streamwise Lagrangian integral ~cales.
sweep, ejection, dispersion, quadrant analysis, turbulent channel flow
ISSN:1001-6058