Cross-chirality transfer of kinetic energy and helicity in compressible helical turbulence

doi:10.1103/PhysRevFluids.5.084604

	Cross-chirality transfer of kinetic energy and helicity in compressible helical turbulence
	Yan Z(闫政)1,2; Li XL(李新亮)1,2 ; Yu ZP(于长平)1,2 ; Wang JC 3
通讯作者	Li, Xinliang(lixl@imech.ac.cn)
发表期刊	PHYSICAL REVIEW FLUIDS
	2020-08-10
卷号	5 期号:8 页码:18
ISSN	2469-990X
摘要	As an underlying mechanism, cross-chirality transfer of kinetic energy and helicity plays an essential role in the turbulent dynamics, which is as important as cross-scale transfer especially in broken mirror-symmetry turbulence. The effects of helicity on the properties of turbulent flows in previous studies highlight the role of cross chirality, which may be developed into an efficient method of turbulence control. We numerically study the cross-chirality transfer of kinetic energy and helicity in this paper, particularly under the influence of compressibility in stationary helical homogeneous and isotropic turbulence. Through combining the Helmholtz decomposition and helical wave decomposition, a general helical wave decomposition is proposed to provide three orthogonal bases for velocity. Within the scope of chiral helicity, there also exists chiral kinetic energy based on chiral velocity. They are defined as the left- and right-chirality kinetic energy, and the remaining compressible component of velocity corresponds to free-chirality kinetic energy. Although there exists no difference in the definition of helicity in incompressible and compressible turbulence, its space-time evolution equation in compressible turbulence involves the compressible component of velocity. The compressibility has a great influence on the homochiral kinetic energy and helicity cascade, and it also plays an essential role in the chirality transfer process like cross-chirality kinetic energy and helicity transfer. The amplitude of cross-chirality kinetic energy transfer is comparable with cross-scale kinetic energy transfer at relatively large scales, and also with viscous dissipation at relatively small scales. The triple nonlinear interactions dominate the cross-chirality transfer relative to pairwise interaction of chiral modes, and it is less sensitive to compressibility. Relative to the compression, the expansion of fluid elements can lead to inverse chirality transfer and strengthen the lack of mirror symmetry. The only discrepancy of cross-chirality helicity transfer between incompressible and compressible turbulence lies in the medium role of the compressible component of velocity. The helicity transfer via the compressible component is weak, and even the kinetic energy of the compressible component relative to that of the other two chiral modes is highest. In addition, the inverse helicity transfer is always statistically associated with the compressible component of velocity via triple interaction extracted from nonlinear interactions.
DOI	10.1103/PhysRevFluids.5.084604
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000557740000007
关键词[WOS]	DIRECT NUMERICAL-SIMULATION ; ISOTROPIC TURBULENCE ; CASCADES ; DYNAMICS ; SPECTRUM ; SCHEMES ; LAWS
WOS研究方向	Physics
WOS类目	Physics, Fluids & Plasmas
资助项目	National Key Research and Development Program of China[2019YFA0405300] ; National Key Research and Development Program of China[2016YFA0401200] ; National Natural Science Foundation of China (NSFC)[91852203] ; Science Challenge Project[TZ2016001]
项目资助者	National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) ; Science Challenge Project
论文分区	二类
力学所作者排名	1
RpAuthor	Li, Xinliang
引用统计	被引频次：5[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/311007/84913
专题	高温气体动力学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.Southern Univ Sci & Technol, Shenzhen Key Lab Complex Aerosp Flows, Ctr Complex Flows & Soft Matter Res, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China
推荐引用方式 GB/T 7714	Yan Z,Li XL,Yu ZP,et al. Cross-chirality transfer of kinetic energy and helicity in compressible helical turbulence[J]. PHYSICAL REVIEW FLUIDS,2020,5,8,:18.
APA	闫政,李新亮,于长平,&Wang JC.(2020).Cross-chirality transfer of kinetic energy and helicity in compressible helical turbulence.PHYSICAL REVIEW FLUIDS,5(8),18.
MLA	闫政,et al."Cross-chirality transfer of kinetic energy and helicity in compressible helical turbulence".PHYSICAL REVIEW FLUIDS 5.8(2020):18.

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