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Helicity transfer in compressible turbulent flows

文献类型：期刊论文

作者Yan, Zheng5; Wu, Junfeng5; Lei, Zhu5; Wang, Jianchun4; Wang, Lifeng3,5; Li, Xinliang1,2; Yu, Changping2; Li XL(李新亮); Yu ZP(于长平)
刊名PHYSICAL REVIEW FLUIDS
出版日期2024-09-04
卷号9期号:9页码:25
ISSN号2469-990X
DOI10.1103/PhysRevFluids.9.094603
通讯作者Wang, Lifeng(wang_lifeng@iapcm.ac.cn) ; Yu, Changping(cpyu@imech.ac.cn)
英文摘要The dual-channel characteristics of large-scale helicity transfer in compressible turbulent flows, including subgrid-scale (SGS) and viscosity terms, are investigated. After selecting a suitable definition for large-scale helicity, we confirm the existence of the dual channel of SGS and viscosity terms of large-scale helicity governing equations and theoretically prove that no dual pressure term channel exists. The second channel of the SGS and viscosity terms also consists of two terms, which originate from the rotation of the SGS stress and the baroclinic of the velocity and density gradients, respectively. The identical relationship of the ensemble averages of the dual channel of SGS and viscosity terms can be theoretically and numerically confirmed, whereas their second channel which is associated with shocklets is more intermittent. For the SGS term, the compression regions are dominant in contrast to the expansion regions, and the strain regions are dominant in contrast to the rotation regions in the inertial scale range. The viscous dissipation mechanism of large-scale helicity differs from that of large-scale kinetic energy. It is dominated by the first channel on the inside of the vortex structure and by the second channel on the outside. The further decompositions of the second channel of the SGS and viscosity terms provide a possible mechanism for the inverse helicity transfer. This means that expansion motions promote inverse helicity transfer through the second terms of their second channels.
WOS关键词ENERGY CASCADE ; NONLINEARITY ; DISSIPATION ; MECHANISM ; VORTICES
资助项目National Natural Science Foundation of China[12302281] ; National Natural Science Foundation of China[11975053] ; National Natural Science Foundation of China[12232018] ; National Natural Science Foundation of China[91852203] ; China Postdoctoral Science Foundation[2022M710459]
WOS研究方向Physics
语种英语
WOS记录号WOS:001310484700001
资助机构National Natural Science Foundation of China ; China Postdoctoral Science Foundation
源URL[http://dspace.imech.ac.cn/handle/311007/96563]  
专题力学研究所_高温气体动力学国家重点实验室
通讯作者Wang, Lifeng; Yu, Changping
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
3.Peking Univ, Ctr Appl Phys & Technol, HEDPS, Beijing 100871, Peoples R China
4.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China
5.Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China
推荐引用方式
GB/T 7714		 Yan, Zheng,Wu, Junfeng,Lei, Zhu,et al. Helicity transfer in compressible turbulent flows[J]. PHYSICAL REVIEW FLUIDS,2024,9(9):25.
APA Yan, Zheng.,Wu, Junfeng.,Lei, Zhu.,Wang, Jianchun.,Wang, Lifeng.,...&于长平.(2024).Helicity transfer in compressible turbulent flows.PHYSICAL REVIEW FLUIDS,9(9),25.
MLA Yan, Zheng,et al."Helicity transfer in compressible turbulent flows".PHYSICAL REVIEW FLUIDS 9.9(2024):25.

入库方式： OAI收割

来源：力学研究所

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