Helicity budget in turbulent channel flows with streamwise rotation
文献类型：期刊论文
| 作者 | Yan, Zheng3; Li, Xinliang1,2 ; Yu, Changping1,2; Li XL(李新亮); Yu ZP(于长平)
|
| 刊名 | PHYSICS OF FLUIDS
 |
| 出版日期 | 2022-06-01 |
| 卷号 | 34期号:6页码:11 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0094910 |
| 通讯作者 | Yu, Changping(cpyu@imech.ac.cn) |
| 英文摘要 | The streamwise rotation effects in turbulent channel flows are reflected not only in the appearance of the secondary flows but also in the weakened streamwise velocity and spanwise vorticity. In this paper, we investigate the secondary flows from three perspectives: the mean spanwise velocity, the mean streamwise vorticity, and combined mean and fluctuating helicity. We found that the combined helicity is also an alternative perspective to characterize the streamwise rotation effect, especially for the secondary flows. The budget equations of the mean and fluctuating helicity in physical space are derived theoretically and analyzed numerically. The streamwise rotation effects on the secondary flows are directly reflected on the pressure and Coriolis terms, which provides an essential source for helicity within the near-wall regions. The production term could be decomposed into two terms, which originate from the momentum and vorticity equations, respectively. The helical stress (velocity-vorticity correlation) originating from the vorticity equation shows a simple profile distribution and is dominant for the production for the helicity within the near-wall regions. The high helical structures in the core regions can be explained as an intense wall-normal transportation, which transfers produced helicity within the near-wall regions into the core regions. Published under an exclusive license by AIP Publishing. |
| WOS关键词 | LARGE-EDDY SIMULATION ; DIRECT NUMERICAL-SIMULATION ; CONVECTION ; STRESS |
| 资助项目 | National Key Research and Development Program of China[2019YFA0405300] ; National Key Research and Development Program of China[2020YFA0711800] ; National Natural Science Foundation of China (NSFC)[12072349] ; National Natural Science Foundation of China (NSFC)[91852203] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000806502300003 |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/89606]  |
| 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 | 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 100049, Peoples R China 3.Inst Appl Phys & Computat Math, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Yan, Zheng,Li, Xinliang,Yu, Changping,et al. Helicity budget in turbulent channel flows with streamwise rotation[J]. PHYSICS OF FLUIDS,2022,34(6):11. |
| APA | Yan, Zheng,Li, Xinliang,Yu, Changping,李新亮,&于长平.(2022).Helicity budget in turbulent channel flows with streamwise rotation.PHYSICS OF FLUIDS,34(6),11. |
| MLA | Yan, Zheng,et al."Helicity budget in turbulent channel flows with streamwise rotation".PHYSICS OF FLUIDS 34.6(2022):11. |
入库方式： OAI收割
来源：力学研究所
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