Analysis of the influence of transverse groove structure on the flow of a flat-plate surface based on Liutex parameters

Engineering Applications of Computational Fluid Mechanics

Yufei Yang¹  Shuguang Li¹  Zhengren Wu¹  Mei Liu² 

[1] School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding, People’s Republic of Chin;School of Energy Power and Mechanical Engineering, North China Electric Power University, Baoding, People’s Republic of Chin;Department of Economic Management, North China Electric Power University, Baoding, People’s Republic of Chin;

关键词: Large-eddy simulation;    transverse groove;    omega criterion;    Liutex;    drag reduction;   

DOI  :  10.1080/19942060.2021.1968955

来源: Taylor & Francis

【 摘 要 】

on turbulent drag reduction has been limited owing to the limitations of existing parameters used for the identification of vortex structures. As a new and more suitable vortex parameter, Liutex provides a novel research method for turbulence control. We used a channel with a transverse groove structure as the research model and employed large-eddy simulation method based on Liutex to study the influence and mechanism of the transverse groove structure on the watershed. The analysis revealed that the transverse groove structure significantly inhibited the vortex intensity, and this effect diminished with the increase of the normal height. Moreover, the transverse groove structure could maintain the stability of the flow vortex and restrain the hairpin vortex. The fundamental action mechanism of the groove structure pertained to slip condition of the bottom surface along the flow direction, which was essential for conveying the bottom fluid. Furthermore, the transverse groove structure could significantly reduce the overall increase in the vortex intensity in the transition layer, and the fluctuation of the vortex intensity in the logarithmic layer was lower under the action of the groove structure. This case can guide the application of the new vortex identification method in turbulence drag reduction.

【 授权许可】

CC BY