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

doi:10.1063/5.0041020

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-)

	Exact time scale of energy exchange in triad interactions of homogeneous isotropic turbulence
	Wu T 3; Fang L 2,3; Wang Z(王展)1
刊名	PHYSICS OF FLUIDS
	2021-03-01
卷号	33 期号:3 页码:12
ISSN号	1070-6631
DOI	10.1063/5.0041020
通讯作者	Fang, L.(le.fang@zoho.com)
英文摘要	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.
分类号	一类/力学重要期刊
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]
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000629635400003
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/86320]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Chinese Acad Sci, Inst Mech, Beijing 100190, Peoples R China 2.Beihang Hangzhou Inst Innovat Yuhang, Hangzhou 310000, Peoples R China; 3.Beihang Univ, Ecole Cent Pekin, LMP, Beijing 100191, 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.