| 题名 | Dual channels of helicity cascade in turbulent flows |
| 作者 | |
| 通讯作者 | Yu, Changping |
| 发表日期 | 2020-07-10
|
| DOI | |
| 发表期刊 | |
| ISSN | 0022-1120
|
| EISSN | 1469-7645
|
| 卷号 | 894 |
| 摘要 | Helicity, as one of only two inviscid invariants in three-dimensional turbulence, plays an important role in the generation and evolution of turbulent flows. Through theoretical analyses, we find that there are two channels in the helicity cascade process, which differs dramatically from the traditional viewpoint. In this paper, we have conducted important research on the newly proposed dual-channel helicity cascade theory, including vortex dynamic processes, intermittent discrepancies, tensor geometries, etc. The first channel mainly originates from the vortex twisting process, and the second channel mainly originates from the vortex stretching process. Antisymmetric tensors are introduced to the derivations of dual-channel helicity cascade theory, and a complex rotation frame leads to a higher helicity transfer efficiency. By analysing data from direct numerical simulations of typical turbulent flows, we find that these two channels behave differently. The ensemble averages of helicity flux in different channels are equal in homogeneous and isotropic turbulence, while they are different in other types of turbulent flows. The intermittency of the second channel is stronger than that of the first channel. In addition, we find a novel mechanism of hindered or even inverse energy cascades, which could be attributed to the second-channel helicity flux. |
| 关键词 | |
| 相关链接 | [来源记录] |
| 收录类别 | |
| 语种 | 英语
|
| 学校署名 | 其他
|
| 资助项目 | National Key Research and Development Program of China[2019YFA0405300]
; National Key Research and Development Program of China[2016YFA0401200]
|
| WOS研究方向 | Mechanics
; Physics
|
| WOS类目 | Mechanics
; Physics, Fluids & Plasmas
|
| WOS记录号 | WOS:000529155000001
|
| 出版者 | |
| EI入藏号 | 20201908639598
|
| EI主题词 | Tensors
; Vortex flow
; Turbulence
|
| EI分类号 | Fluid Flow, General:631.1
; Algebra:921.1
|
| ESI学科分类 | ENGINEERING
|
| 来源库 | Web of Science
|
| 引用统计 |
被引频次[WOS]：22
|
| 成果类型 | 期刊论文 |
| 条目标识符 | http://sustech.caswiz.com/handle/2SGJ60CL/127169 |
| 专题 | 工学院_力学与航空航天工程系 |
| 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, Dept Mech & Aerosp Engn, Shenzhen 518055, Guangdong, Peoples R China 4.Peking Univ, Coll Engn, Ctr Appl Phys & Technol, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 |
Yan, Zheng,Li, Xinliang,Yu, Changping,et al. Dual channels of helicity cascade in turbulent flows[J]. JOURNAL OF FLUID MECHANICS,2020,894.
|
| APA |
Yan, Zheng,Li, Xinliang,Yu, Changping,Wang, Jianchun,&Chen, Shiyi.(2020).Dual channels of helicity cascade in turbulent flows.JOURNAL OF FLUID MECHANICS,894.
|
| MLA |
Yan, Zheng,et al."Dual channels of helicity cascade in turbulent flows".JOURNAL OF FLUID MECHANICS 894(2020).
|
| 条目包含的文件 | 条目无相关文件。 | |||||
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