Effects of vortex formation and interaction on turbulent mass transfer over a two-dimensional wavy wall

doi:10.1103/PhysRevFluids.7.114607

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Effects of vortex formation and interaction on turbulent mass transfer over a two-dimensional wavy wall
	Zhang, Enwei 2; Wu, Wangxia 1; Liu, Qingquan 1; Wang, Xiaoliang 1
刊名	PHYSICAL REVIEW FLUIDS
	2022-11-21
卷号	7 期号:11 页码:21
ISSN号	2469-990X
DOI	10.1103/PhysRevFluids.7.114607
通讯作者	Liu, Qingquan(liuqq@bit.edu.cn)
英文摘要	The present paper conducted a large-eddy simulation of turbulent flow and mass trans-fer over two-dimensional wavy walls with different wave slopes (ratio of amplitude to wavelength ranging from 0.0375 to 0.1) to investigate the generation and interaction of vortices and the effect on turbulent mass transfer. The present wavy wall induces flow separation and reconstructs a turbulent shear layer having a concave feature, and thus triggers streamwise vortices via the centrifugal instability mechanism. We confirm that these vortices originate from separation and reattachment points. The convex wall enhances the spanwise vorticity traced to the upstream trough, such that spanwise vortices form via the Kelvin-Helmholtz instability mechanism deviating from the crest. There are four vortex modes between crests controlling the turbulent scalar statistics. (1) The interaction between spanwise and streamwise vorticity activates strong shear, high-level turbulent kinetic energy (TKE) and Reynolds shear stress (RSS) near the separation point while upstreaming the origins of high streamwise and vertical turbulent scalar fluxes (VTSF). (2) The shear effect in the separation zone maintains the TKE and RSS, whereas the trapped separation bubble causes dominated scalar diffusion on the leeward side. (3) Vortex pairs are generated at the reattachment point to eject low-momentum and low-scalar fluids upward into the average flow. (4) The layout of vortices on the windward side is reversed to that in the separation point, and the restriction of the convex wall on the streamwise vorticity weakens the shear and forms a region of low RSS and VTSF.
资助项目	National Natural Science Foundation of China ; [12032005] ; [12172057] ; [12002039]
WOS关键词	LARGE-EDDY SIMULATION ; HEAT-TRANSFER ; NUMERICAL-SIMULATION ; SEDIMENT TRANSPORT ; CHANNEL FLOW ; CONVECTION ; AMPLITUDE ; STEADY ; DUNES ; MECHANISMS
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000893260600001
资助机构	National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/91201]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
通讯作者	Liu, Qingquan
作者单位	1.Beijing Inst Technol, Sch Aerosp Engn, Beijing 100081, Peoples R China 2.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Enwei,Wu, Wangxia,Liu, Qingquan,et al. Effects of vortex formation and interaction on turbulent mass transfer over a two-dimensional wavy wall[J]. PHYSICAL REVIEW FLUIDS,2022,7(11):21.
APA	Zhang, Enwei,Wu, Wangxia,Liu, Qingquan,&Wang, Xiaoliang.(2022).Effects of vortex formation and interaction on turbulent mass transfer over a two-dimensional wavy wall.PHYSICAL REVIEW FLUIDS,7(11),21.
MLA	Zhang, Enwei,et al."Effects of vortex formation and interaction on turbulent mass transfer over a two-dimensional wavy wall".PHYSICAL REVIEW FLUIDS 7.11(2022):21.