| Helicity transfer in compressible turbulent flows | |
Yan Z(闫政)1; Wu, Junfeng1; Lei, Zhu1; Wang, Jianchun2; Wang, Lifeng1,3; Li XL(李新亮)4,5 ; Yu ZP(于长平)4
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| Corresponding Author | Wang, Lifeng([email protected]) ; Yu, Changping([email protected]) |
| Source Publication | PHYSICAL REVIEW FLUIDS
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| 2024-09-04 | |
| Volume | 9Issue:9Pages:25 |
| ISSN | 2469-990X |
| Abstract | 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. |
| DOI | 10.1103/PhysRevFluids.9.094603 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001310484700001 |
| WOS Keyword | ENERGY CASCADE ; NONLINEARITY ; DISSIPATION ; MECHANISM ; VORTICES |
| WOS Research Area | Physics |
| WOS Subject | Physics, Fluids & Plasmas |
| Funding Project | 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] |
| Funding Organization | National Natural Science Foundation of China ; China Postdoctoral Science Foundation |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Wang, Lifeng ; Yu, Changping |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/96564 |
| Collection | 高温气体动力学国家重点实验室 |
| Affiliation | 1.Inst Appl Phys & Computat Math, Beijing 100094, Peoples R China; 2.Southern Univ Sci & Technol, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China; 3.Peking Univ, Ctr Appl Phys & Technol, HEDPS, Beijing 100871, Peoples R China; 4.Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China; 5.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Yan Z,Wu, Junfeng,Lei, Zhu,et al. Helicity transfer in compressible turbulent flows[J]. PHYSICAL REVIEW FLUIDS,2024,9,9,:25.Rp_Au:Wang, Lifeng, Yu, Changping |
| APA | 闫政.,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 | 闫政,et al."Helicity transfer in compressible turbulent flows".PHYSICAL REVIEW FLUIDS 9.9(2024):25. |
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