Coherent structures associated with interscale energy transfer in turbulent channel flows

doi:10.1103/PhysRevFluids.6.104601

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	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
通讯作者	Wang, Shizhao(wangsz@lnm.imech.ac.cn)
发表期刊	PHYSICAL REVIEW FLUIDS
	2021-10-07
卷号	6 期号:10 页码:24
ISSN	2469-990X
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.
DOI	10.1103/PhysRevFluids.6.104601
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000704800200002
关键词[WOS]	SELF-SUSTAINING PROCESS ; LARGE-SCALE MOTIONS ; REYNOLDS-NUMBER ; WALL ; GENERATION ; VORTICES ; REGION ; LAYER ; DYNAMICS ; SPECTRA
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China (NSFC)[11988102] ; NSFC[12072348]
项目资助者	National Natural Science Foundation of China (NSFC) ; NSFC
论文分区	二类
力学所作者排名	1
RpAuthor	Wang, Shizhao
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/87499
专题	非线性力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, 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.

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