期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：242
期号：6
页码：1-7
DOI：10.1088/1755-1315/242/6/062035
出版社：IOP Publishing
摘要：Large eddy simulations were used to study the effect of groove structures on rotational motion of fluid in wall turbulence, from the perspective of coherent structures. The results show that groove structures reduce the per unit normal height internal velocity gradient in the near-wall region and decrease shear stress and viscous resistance. Concurrently, owing to the decrease in the velocity gradient, shear action is weakened, and the vortices' level of stretch is reduced in the near-wall region of the grooved surface. The groove structures change the distribution of the shear layers in the boundary layer and increase the stability of the strips. The reduction of spanwise vorticities delayed the formation of hairpin vortices caused by the instability of strips and so on; and the energy dissipation is effectively reduced in the flow process.
