Coherent structures associated with interscale energy transfer in turbulent channel flows

doi:10.1103/PhysRevFluids.6.104601

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Coherent structures associated with interscale energy transfer in turbulent channel flows
	Wang HP(王洪平)1,2; Yang ZX(杨子轩)1,2; Wu T(吴霆)1,2; Wang SZ(王士召)1,2
刊名	PHYSICAL REVIEW FLUIDS
	2021-10-07
卷号	6 期号:10 页码:24
ISSN号	2469-990X
DOI	10.1103/PhysRevFluids.6.104601
通讯作者	Wang, Shizhao(wangsz@lnm.imech.ac.cn)
英文摘要	We analyze the energy spectra, production spectra, and interscale energy transfer spectra for direct numerical simulation data of turbulent channel flows at Re-tau = 180 and 550. The transfer spectra are characterized by a negative region and a positive region. We use the negative region as a spectral mask to separate the flow fields into large-scale and small-scale fields. The former are characterized by streaks and quasi-streamwise vortices, and the latter are characterized by hairpin-like vortical structures that are similar to the original flow fields. Proper orthogonal decomposition and linear stochastic estimation are utilized to further extract the flow structures of the decomposed fields. The outer large-scale low-momentum regions are flanked by large quasi-streamwise vortices that are attached to the wall. This coherent structure presents a high degree of similarity to the structure of the near-wall cycle. This result indicates that the outer large scales may present a self-sustaining mechanism similar to that of the near-wall region. We also extract the coherent structures associated with the real-space energy transfer. The formation of small-scale hairpin-like vortices is related to the large-scale shear layer. Within this process, the energy is transferred from large scales to small scales.
分类号	二类
资助项目	National Natural Science Foundation of China (NSFC)[11988102] ; NSFC[12072348]
WOS关键词	SELF-SUSTAINING PROCESS ; LARGE-SCALE MOTIONS ; REYNOLDS-NUMBER ; WALL ; GENERATION ; VORTICES ; REGION ; LAYER ; DYNAMICS ; SPECTRA
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:000704800200002
资助机构	National Natural Science Foundation of China (NSFC) ; NSFC
其他责任者	Wang, Shizhao
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/87498]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Wang HP,Yang ZX,Wu T,et al. Coherent structures associated with interscale energy transfer in turbulent channel flows[J]. PHYSICAL REVIEW FLUIDS,2021,6(10):24.
APA	王洪平,杨子轩,吴霆,&王士召.(2021).Coherent structures associated with interscale energy transfer in turbulent channel flows.PHYSICAL REVIEW FLUIDS,6(10),24.
MLA	王洪平,et al."Coherent structures associated with interscale energy transfer in turbulent channel flows".PHYSICAL REVIEW FLUIDS 6.10(2021):24.