Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers
文献类型：期刊论文
| 作者 | Chen, Kaiwen3; Xu, Duo1,2 ; Song, Baofang3; Xu D(徐多)
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| 刊名 | JOURNAL OF FLUID MECHANICS
 |
| 出版日期 | 2022-01-25 |
| 卷号 | 935页码:22 |
| 关键词 | shear-flow instability transition to turbulence pipe flow |
| ISSN号 | 0022-1120 |
| DOI | 10.1017/jfm.2021.1160 |
| 通讯作者 | Song, Baofang(baofang_song@tju.edu.cn) |
| 英文摘要 | We investigated the propagation of turbulent fronts in pipe flow at high Reynolds numbers by direct numerical simulation. We used a technique combining a moving frame of reference and an artificial damping to isolate the fronts in short periodic pipes, which enabled us to explore the bulk Reynolds number up to Re = 10(5) with affordable computation power. We measured the propagation speed of the downstream front and observed that a fit of 1.971 - (Re/1925)(-0.825) (in unit of bulk speed) captures this speed above Re similar or equal to 5000 very well. The speed increases monotonically as Re increases, in stark contrast to the decreasing trend above Re similar or equal to 10 000 reported by Wygnanski & Champagne (J. FluidMech., vol. 59, 1973, pp. 281-335). The speed of the upstream front overall agrees with the former studies and 0.024 + (Re/1936)(-0.528) fits our data well, and those from the literature. Based on our analysis of the front dynamics, we proposed that both front speeds would keep their respective monotonic trends as the Reynolds number increases further. We show that, at high Reynolds numbers, the local transition at the upstream front tip is via high-azimuthal-wavenumber structures in the high-shear region near the pipe wall, whereas at the downstream front tip is via low-azimuthal-wavenumber structures in the low-shear region near the pipe centre. This difference is possibly responsible for the asymmetric speed scalings between the upstream and downstream fronts. |
| WOS关键词 | DIRECT NUMERICAL-SIMULATION ; TRANSITION ; VELOCITY ; SLUGS ; PUFFS |
| 资助项目 | National Natural Science Foundation of China[91852105] ; National Natural Science Foundation of China[91752113] ; Tianjin University[2018XRX-0027] ; NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics'[11988102] |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000865735200001 |
| 资助机构 | National Natural Science Foundation of China ; Tianjin University ; NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/90406]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 通讯作者 | Song, Baofang |
| 作者单位 | 1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China 3.Tianjin Univ, Ctr Appl Math, Tianjin 300072, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Kaiwen,Xu, Duo,Song, Baofang,et al. Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers[J]. JOURNAL OF FLUID MECHANICS,2022,935:22. |
| APA | Chen, Kaiwen,Xu, Duo,Song, Baofang,&徐多.(2022).Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers.JOURNAL OF FLUID MECHANICS,935,22. |
| MLA | Chen, Kaiwen,et al."Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers".JOURNAL OF FLUID MECHANICS 935(2022):22. |
入库方式： OAI收割
来源：力学研究所
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