Transfers of energy and helicity in helical rotating turbulence

doi:10.1017/jfm.2022.580

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	Transfers of energy and helicity in helical rotating turbulence
	Hu RN(胡润宁)1,2; Li XL(李新亮)1,2; Yu ZP(于长平)2
刊名	JOURNAL OF FLUID MECHANICS
	2022-08-03
卷号	946 页码:33
关键词	rotating turbulence turbulence simulation turbulence theory
ISSN号	0022-1120
DOI	10.1017/jfm.2022.580
通讯作者	Yu, Changping(cpyu@imech.ac.cn)
英文摘要	Helical rotating turbulence is a chiral and anisotropic flow. The energy and helicity transfers of helical rotating turbulence are studied in this paper. First, we discuss the antisymmetry and conservation of energy and helicity transfers. There are three expressions for helicity transfers due to the commutability of differential operators. The first expression is derived here. The second expression violates antisymmetry, and the third one introduces non-physical effects. The relations of these expressions are discussed in detail, including those about the sum of all triads and partial triads, as well as those about helical wave decomposition. Through direct numerical simulations, we find that helicity can reduce inverse energy cascades. The inhibition is mainly associated with transhelical energy fluxes and the interactions of two-dimensional modes. The inverse cascades of decomposed energy fluxes are related to the two-dimensionalization. For helicity, rotation does not affect the total helicity flux but generally suppresses the decomposed helicity fluxes. Positive homochiral and negative heterochiral helicity fluxes are associated with corresponding positive anisotropic transfers. Notably, the transhelical helicity fluxes increase the amplitudes of both positive and negative helicity, which is related to the chirality polarization.
分类号	一类/力学重要期刊
资助项目	National Key Research and Development Program of China[2019YFA0405300] ; National Key Research and Development Program of China[2020YFA0711800] ; NSFC Projects[91852203] ; NSFC Projects[12072349]
WOS关键词	RESONANT INTERACTIONS ; DYNAMICS ; SCALES
WOS研究方向	Mechanics ; Physics
语种	英语
WOS记录号	WOS:000835349400001
资助机构	National Key Research and Development Program of China ; NSFC Projects
其他责任者	Yu, Changping
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/89846]
专题	力学研究所_高温气体动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, LHD, Beijing 100190, Peoples R China;
推荐引用方式 GB/T 7714	Hu RN,Li XL,Yu ZP. Transfers of energy and helicity in helical rotating turbulence[J]. JOURNAL OF FLUID MECHANICS,2022,946:33.
APA	胡润宁,李新亮,&于长平.(2022).Transfers of energy and helicity in helical rotating turbulence.JOURNAL OF FLUID MECHANICS,946,33.
MLA	胡润宁,et al."Transfers of energy and helicity in helical rotating turbulence".JOURNAL OF FLUID MECHANICS 946(2022):33.