| Coherent structures associated with interscale energy transfer in turbulent channel flows | |
Wang HP(王洪平)1,2; Yang ZX(杨子轩)1,2; Wu T(吴霆)1,2; Wang SZ(王士召)1,2
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| Corresponding Author | Wang, Shizhao([email protected]) |
| Source Publication | PHYSICAL REVIEW FLUIDS
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| 2021-10-07 | |
| Volume | 6Issue:10Pages:24 |
| ISSN | 2469-990X |
| Abstract | We analyze the energy spectra, production spectra, and interscale energy transfer spectra for direct numerical simulation data of turbulent channel flows at Re-tau = 180 and 550. The transfer spectra are characterized by a negative region and a positive region. We use the negative region as a spectral mask to separate the flow fields into large-scale and small-scale fields. The former are characterized by streaks and quasi-streamwise vortices, and the latter are characterized by hairpin-like vortical structures that are similar to the original flow fields. Proper orthogonal decomposition and linear stochastic estimation are utilized to further extract the flow structures of the decomposed fields. The outer large-scale low-momentum regions are flanked by large quasi-streamwise vortices that are attached to the wall. This coherent structure presents a high degree of similarity to the structure of the near-wall cycle. This result indicates that the outer large scales may present a self-sustaining mechanism similar to that of the near-wall region. We also extract the coherent structures associated with the real-space energy transfer. The formation of small-scale hairpin-like vortices is related to the large-scale shear layer. Within this process, the energy is transferred from large scales to small scales. |
| DOI | 10.1103/PhysRevFluids.6.104601 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000704800200002 |
| WOS Keyword | SELF-SUSTAINING PROCESS ; LARGE-SCALE MOTIONS ; REYNOLDS-NUMBER ; WALL ; GENERATION ; VORTICES ; REGION ; LAYER ; DYNAMICS ; SPECTRA |
| WOS Research Area | Physics |
| WOS Subject | Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China (NSFC)[11988102] ; NSFC[12072348] |
| Funding Organization | National Natural Science Foundation of China (NSFC) ; NSFC |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Wang, Shizhao |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/87499 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Wang HP,Yang ZX,Wu T,et al. Coherent structures associated with interscale energy transfer in turbulent channel flows[J]. PHYSICAL REVIEW FLUIDS,2021,6,10,:24.Rp_Au:Wang, Shizhao |
| APA | 王洪平,杨子轩,吴霆,&王士召.(2021).Coherent structures associated with interscale energy transfer in turbulent channel flows.PHYSICAL REVIEW FLUIDS,6(10),24. |
| MLA | 王洪平,et al."Coherent structures associated with interscale energy transfer in turbulent channel flows".PHYSICAL REVIEW FLUIDS 6.10(2021):24. |
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| Jp2021F384.pdf（5575KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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