| Direct numerical simulation of supersonic bump flow with shock impingement | |
Lai, Jiang ; Fan, Zhaolin; Dong, Siwei; Li XL(李新亮); Tong FL(童福林); Yuan, Xianxu
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| Corresponding Author | Tong, Fulin([email protected]) ; Yuan, Xianxu([email protected]) |
| Source Publication | PHYSICS OF FLUIDS
 |
| 2022-10-01 | |
| Volume | 34Issue:10Pages:22 |
| ISSN | 1070-6631 |
| Abstract | Direct numerical simulations are carried out to identify the effects of shock impingement on the behavior of bump flow at freestream Mach number of 2.25. Two cosine-shaped bump cases, with and without an impinging oblique shock at an angle of 33.2 degrees, are compared. The shock impingement exhibits a remarkable influence on the pattern of the shock system and on the size of the separation region. A spectral analysis finds that low-frequency unsteadiness is significantly enhanced by the impingement interaction, and the proper orthogonal decomposition highlights the low-frequency breathing motion of the separation bubble, which is accurately reconstructed using only the first ten low-order modes. Downstream of the bump, both the Reynolds stress components and the turbulence kinetic energy exhibit a general amplification, with the peaks reoccurring at outer wall-normal locations. A turbulent kinetic energy budget analysis shows the greatly increased production in the outer layer which is balanced by turbulent transport and dissipation. An anisotropy-invariant map analysis identifies enhanced isotropic turbulence in the vicinity of the bump, which is qualitatively modified into a two-component axisymmetric state around the reattachment point. In addition, the mean skin friction decomposition suggests that the shock impingement has little influence on the predominant contribution of turbulence kinetic energy production, apart from the spatial growth dominance at the bump summit in the absence of the impinging shock. Interestingly, a scale-decomposed analysis quantitatively demonstrates that the contributions of small-scale structures are attenuated, but those of large-scale ones are relatively increased, with a contribution of more than 80% with shock impingement. Published under an exclusive license by AIP Publishing. |
| DOI | 10.1063/5.0106488 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:000886552100009 |
| WOS Keyword | TURBULENT-BOUNDARY-LAYER ; LARGE-EDDY SIMULATION ; LOW-FREQUENCY UNSTEADINESS ; VELOCITY FLUCTUATIONS ; COMPRESSION-RAMP ; SKIN-FRICTION ; CURVED HILL ; NEAR-WALL ; WAVE ; PROGRESS |
| WOS Research Area | Mechanics ; Physics |
| WOS Subject | Mechanics ; Physics, Fluids & Plasmas |
| Funding Project | National Natural Science Foundation of China (NSFC) ; [11972356] |
| Funding Organization | National Natural Science Foundation of China (NSFC) |
| Classification | 一类/力学重要期刊 |
| Ranking | 3+ |
| Contributor | Tong, Fulin ; Yuan, Xianxu |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/91060 |
| Collection | 高温气体动力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Lai, Jiang,Fan, Zhaolin,Dong, Siwei,et al. Direct numerical simulation of supersonic bump flow with shock impingement[J]. PHYSICS OF FLUIDS,2022,34,10,:22.Rp_Au:Tong, Fulin, Yuan, Xianxu |
| APA | Lai, Jiang,Fan, Zhaolin,Dong, Siwei,李新亮,童福林,&Yuan, Xianxu.(2022).Direct numerical simulation of supersonic bump flow with shock impingement.PHYSICS OF FLUIDS,34(10),22. |
| MLA | Lai, Jiang,et al."Direct numerical simulation of supersonic bump flow with shock impingement".PHYSICS OF FLUIDS 34.10(2022):22. |
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| Jp2022FA137_2022_Dir（8084KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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