Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow

Zhang，Shengqi1; Xia，Zhenhua2; Chen，Shiyi1,3

2024-01-22

10.1017/jfm.2023.1091

Journal of Fluid Mechanics   影响因子和分区

0022-1120

1469-7645

Based on the characteristics of large-scale plume currents in rotating plane Poiseuille flows (RPPF), an injection/suction control strategy is introduced to augment the intensity of plume currents and improve the turbulent transport of passive scalar. The control strategy maintains the conventional non-penetrative condition on the stable side, and applies a wall-normal velocity that varies in the spanwise direction on the unstable side. For comparison, the control with non-penetrative condition on the unstable side and injection/suction on the stable side is also examined. The RPPF at ranging from to and ranging from to are studied. Injection/suction with fixed root-mean-squared wall-normal velocity (below of the bulk mean velocity) at the wall is considered. Direct numerical simulations reveal that the injection/suction on the stable side has minor effect for all cases studied, whereas the injection/suction with properly distributed slots on the unstable side can significantly enhance the large-scale plume currents and the turbulent transport efficiency at small or moderate rotation numbers. This is attributed to the fact that plumes are generated on the unstable side, and controlling the origin of plumes is more effective. A proper strategy for maximum enhancement of turbulent transport is limiting the distance between injection slots equal to or slightly larger than the intrinsic distance between plume currents. This strategy is valid for all physical and computational parameters currently considered, and is potentially applicable over a much wider parameter range.

mixing enhancement rotating turbulence

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85183925364

Scopus

1.Eastern Institute for Advanced Study,Eastern Institute of Technology,Ningbo,315201,China
2.Department of Engineering Mechanics,Zhejiang University,Hangzhou,310027,China
3.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Zhang，Shengqi,Xia，Zhenhua,Chen，Shiyi. Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow[J]. Journal of Fluid Mechanics,2024,979.

Zhang，Shengqi,Xia，Zhenhua,&Chen，Shiyi.(2024).Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow.Journal of Fluid Mechanics,979.

Zhang，Shengqi,et al."Enhancing large-scale motions and turbulent transport in rotating plane Poiseuille flow".Journal of Fluid Mechanics 979(2024).