| Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers | |
Chen,Kaiwen1; Xu D(徐多)2,3 ; Song,Baofang1
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| Corresponding Author | Song, Baofang([email protected]) |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2022-01-25 | |
| Volume | 935Pages:A11 |
| ISSN | 0022-1120 |
| Abstract | 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. |
| Keyword | shear-flow instability transition to turbulence pipe flow |
| DOI | 10.1017/jfm.2021.1160 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000865735200001 |
| WOS Keyword | DIRECT NUMERICAL-SIMULATION ; TRANSITION ; VELOCITY ; SLUGS ; PUFFS |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | 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] |
| Funding Organization | National Natural Science Foundation of China ; Tianjin University ; NSFC Basic Science Center Program for 'Multiscale Problems in Nonlinear Mechanics' |
| Classification | 一类/力学重要期刊 |
| Ranking | 2 |
| Contributor | Song, Baofang |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/90407 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Tianjin Univ, Ctr Appl Math, Tianjin 300072, Peoples R China; 2.Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China; 3.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Chen,Kaiwen,Xu D,Song,Baofang. Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers[J]. JOURNAL OF FLUID MECHANICS,2022,935:A11.Rp_Au:Song, Baofang |
| APA | Chen,Kaiwen,徐多,&Song,Baofang.(2022).Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers.JOURNAL OF FLUID MECHANICS,935,A11. |
| MLA | Chen,Kaiwen,et al."Propagation speed of turbulent fronts in pipe flow at high Reynolds numbers".JOURNAL OF FLUID MECHANICS 935(2022):A11. |
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| Jp2022FA550_2022_Pro（1166KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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