| Influence of spanwise wall vibration on non-modal perturbations subject to freestream vortical disturbances in hypersonic boundary layers | |
| Song QY(宋沁阳); Dong M(董明); Zhao, Lei; Chu, Xianying; Wu, Ningning | |
| Source Publication | JOURNAL OF FLUID MECHANICS
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| 2024-11 | |
| Volume | 999Pages:A57 |
| ISSN | 0022-1120 |
| Abstract | In this paper, we study the effect of lateral wall vibrations on the excitation and evolution of non-modal perturbations in hypersonic boundary layers subject to low-frequency freestream vortical disturbances (FSVDs). A novel, high-efficiency numerical approach, combining the harmonic weakly nonlinear Navier-Stokes and nonlinear parabolised stability equation approaches, is developed, which is sufficient to accommodate both the rapid distortion of the perturbation in the leading-edge vicinity and the nonlinear development of finite-amplitude high-order harmonics in the downstream region. The boundary-layer response to low-frequency FSVDs shows a longitudinal streaky structure, for which the temperature perturbation shows much greater magnitude than the streamwise velocity perturbation. The lateral vibration induces a Stokes layer solution for the spanwise velocity perturbation, which interacts with the FSVD-induced perturbations and leads to a suppression of the non-modal perturbation and an enhancement of the downstream modal perturbation. The new perturbations excited by the FSVD-vibration interaction strengthen as the vibration intensifies, and they could become comparable with the FSVD-induced perturbations in downstream locations at a high vibration intensity, indicating a remarkable modification of the streaky structure and its instability property. Secondary instability (SI) analyses based on the streaky base flow indicate that the vibration could enhance or suppress the SI modes, depending on their initial phases over the vibration period. Overall, the average effect is that the low-frequency and high-frequency SI modes are stabilised and destabilised by the vibration, respectively. Since the high-frequency SI modes undergo higher amplifications, the subsequent bypass transition is likely to be promoted by relatively strong vibrations. |
| Keyword | boundary layer stability transition to turbulence |
| DOI | 10.1017/jfm.2024.938 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001354437200001 |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Organization | National Science Foundation of China {U20B2003, 92371104, 12372222, 12002235, 11988102] ; Strategic Priority Research Program, CAS {XDB22040104] |
| Classification | 一类/力学重要期刊 |
| Ranking | 1 |
| Contributor | Dong M ; Zhao L |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/97176 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.【Song, Qinyang & Dong, Ming】 Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China 2.【Zhao, Lei】 Tianjin Univ, Dept Mech, Tianjin 300072, Peoples R China 3.【Chu, Xianying & Wu, Ningning】 Beijing Aerosp Technol Inst, Beijing 100074, Peoples R China |
| Recommended Citation GB/T 7714 | Song QY,Dong M,Zhao, Lei,et al. Influence of spanwise wall vibration on non-modal perturbations subject to freestream vortical disturbances in hypersonic boundary layers[J]. JOURNAL OF FLUID MECHANICS,2024,999:A57.Rp_Au:Dong M, Zhao L |
| APA | 宋沁阳,董明,Zhao, Lei,Chu, Xianying,&Wu, Ningning.(2024).Influence of spanwise wall vibration on non-modal perturbations subject to freestream vortical disturbances in hypersonic boundary layers.JOURNAL OF FLUID MECHANICS,999,A57. |
| MLA | 宋沁阳,et al."Influence of spanwise wall vibration on non-modal perturbations subject to freestream vortical disturbances in hypersonic boundary layers".JOURNAL OF FLUID MECHANICS 999(2024):A57. |
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