Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow | |
Yang ZX(杨子轩)1; Deng BQ2,3; Wang BC4; Shen L2,3 | |
Corresponding Author | Deng, Bing-Qing(bdeng@umn.edu) |
Source Publication | PHYSICAL REVIEW FLUIDS |
2020-04-21 | |
Volume | 5Issue:4Pages:24 |
ISSN | 2469-990X |
Abstract | Energy transport in the spectral space is analyzed to study the mechanism underlying the Taylor-Gortler-like (TGL) vortices that appear as two layers of streamwise-elongated roll cells in a turbulent channel flow subjected to fast streamwise system rotation. The transport equation of the velocity-spectrum tensor in a rotating frame is derived to study the budget balance of energy spectra at different length scales. Two new terms, namely, the rotation-induced redistribution term and rotation-induced wall-normal diffusion term, are defined to reflect the effect of the imposed system rotation on the energy transport process. By analyzing the data obtained from direct numerical simulation, it is discovered that four key processes are responsible for sustaining the motion of the TGL vortices. The first process corresponds to the energy production at the characteristic length scales of the TGL vortices that drains energy from the mean flow to the TGL vortices. The second process is the rotation-induced energy redistribution from the streamwise velocity fluctuations to the wall-normal and spanwise velocity fluctuations that form the vortex structures on a cross-stream plane. The third process is the energy diffusion from the near-wall region to the channel center, which is enhanced due to the occurrence of the TGL vortices and, in turn, feeds energy to the vortices. The last process is the inverse interscale energy transfer, through which the large-scale TGL vortices absorb energy from small-scale eddies. |
DOI | 10.1103/PhysRevFluids.5.044601 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000527140000004 |
WOS Keyword | REYNOLDS-STRESS ; SPANWISE ROTATION ; BOUNDARY-LAYER ; TURBULENT ; ENERGY ; INSTABILITIES ; SIMULATIONS ; COUETTE ; BUDGETS |
WOS Research Area | Physics |
WOS Subject | Physics, Fluids & Plasmas |
Funding Project | NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Institute of Mechanics, Chinese Academy of Sciences ; Natural Sciences and Engineering Research Council (NSERC) of Canada |
Funding Organization | NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Institute of Mechanics, Chinese Academy of Sciences ; Natural Sciences and Engineering Research Council (NSERC) of Canada |
Classification | 二类 |
Ranking | 1 |
Contributor | Deng, Bing-Qing |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/81859 |
Collection | 非线性力学国家重点实验室 |
Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Minnesota, Dept Mech Engn, 111 Church St SE, Minneapolis, MN 55455 USA; 3.Univ Minnesota, St Anthony Falls Lab, Minneapolis, MN 55455 USA; 4.Univ Manitoba, Dept Mech Engn, Winnipeg, MB R3T 5V6, Canada |
Recommended Citation GB/T 7714 | Yang ZX,Deng BQ,Wang BC,et al. Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow[J]. PHYSICAL REVIEW FLUIDS,2020,5,4,:24. |
APA | 杨子轩,Deng BQ,Wang BC,&Shen L.(2020).Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow.PHYSICAL REVIEW FLUIDS,5(4),24. |
MLA | 杨子轩,et al."Sustaining mechanism of Taylor-Gortler-like vortices in a streamwise-rotating channel flow".PHYSICAL REVIEW FLUIDS 5.4(2020):24. |
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