Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence

doi:10.1063/5.0041020

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	Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence
	Wu T 1; Fang L1,2 ; Wang Z(王展)3
通讯作者	Fang, L.(le.fang@zoho.com)
发表期刊	PHYSICS OF FLUIDS
	2021-03-01
卷号	33 期号:3 页码:12
ISSN	1070-6631
摘要	We solve analytically the period of a single triad interaction of homogeneous isotropic turbulence. Comparing with the traditional concept of the timescale of energy transfer, we found that this period is a timescale of energy exchange among the three wave vectors of a triad. Quantitatively, the timescale of energy exchange is usually longer if the equilibrium dissipation law is satisfied; however, when energy transfer is suppressed, the energy exchange becomes dominant. We extract the periods in typical numerical experiments of triad interactions and show that they are in good agreement with theoretical predictions. This picture implies that energy exchange corresponds to oscillation, while energy transfer corresponds to damping, and the damping rate is correlated with the oscillation. The present results of the timescale of energy transfer are expected to be applied in nonequilibrium turbulent flows.
DOI	10.1063/5.0041020
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000629635400003
WOS研究方向	Mechanics ; Physics
WOS类目	Mechanics ; Physics, Fluids & Plasmas
资助项目	National Natural Science Foundation of China[11572025] ; National Natural Science Foundation of China[11772032] ; National Natural Science Foundation of China[51420105008] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040203]
项目资助者	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
论文分区	一类/力学重要期刊
力学所作者排名	3
引用统计	被引频次：3[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/311007/86321
专题	流固耦合系统力学重点实验室
作者单位	1.Beihang Univ, Ecole Cent Pekin, LMP, Beijing 100191, Peoples R China; 2.Beihang Hangzhou Inst Innovat Yuhang, Hangzhou 310000, Peoples R China; 3.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Wu T,Fang L,Wang Z. Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence[J]. PHYSICS OF FLUIDS,2021,33,3,:12.
APA	Wu T,Fang L,&王展.(2021).Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence.PHYSICS OF FLUIDS,33(3),12.
MLA	Wu T,et al."Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence".PHYSICS OF FLUIDS 33.3(2021):12.

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