| Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp | |
Tong FL(童福林); Li XL(李新亮) ; Duan, Yanhui; Yu ZP(于长平); Yu, CP (reprint author), Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China.
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| Source Publication | PHYSICS OF FLUIDS |
| 2017 | |
| Conference Name | Meeting of the Institute-of-Non-Newtonian-Fluid-Mechanics (INNFM) |
| Conference Date | 2017 |
| Conference Place | Llanwddyn, WALES |
| Abstract | Numerical investigations on a supersonic turbulent boundary layer over a longitudinal curved compression ramp are conducted using direct numerical simulation for a free stream Mach number M-infinity = 2.9 and Reynolds number Re-theta = 2300. The total turning angle is 24 degrees, and the concave curvature radius is 15 times the thickness of the incoming turbulent boundary layer. Under the selected conditions, the shock foot is transferred to a fan of the compression wave because of the weaker adverse pressure gradient. The time-averaged flow-field in the curved ramp is statistically attached where the instantaneous flow-field is close to the intermittent transitory detachment state. Studies on coherent vortex structures have shown that large-scale vortex packets are enhanced significantly when the concave curvature is aligned in the spanwise direction. Consistent with findings of previous experiments, the effect of the concave curvature on the logarithmic region of the mean velocity profiles is found to be small. The intensity of the turbulent fluctuations is amplified across the curved ramp. Based on the analysis of the Reynolds stress anisotropy tensor, the evolutions of the turbulence state in the inner and outer layers of the boundary layer are considerably different. The curvature effect on the transport mechanism of the turbulent kinetic energy is studied using the balance analysis of the contributing terms in the transport equation. Furthermore, the Gortler instability in the curved ramp is quantitatively analyzed using a stability criterion. The instantaneous streamwise vorticity confirms the existence of the Gortler-like structures. These structures are characterized by an unsteady motion. In addition, the dynamic mode decomposition analysis of the instantaneous flow field at the spanwise/wall-normal plane reveals that four dynamical relevant modes with performance loss of 16% provide an optimal low-order representation of the essential characteristics of the numerical data. The spatial structures of the dominated low-frequency dynamic modes are found to be similar to that of the Gortler-like vortices. Published by AIP Publishing. |
| Keyword | Concave Surface Curvature Adverse Pressure-gradient Large-eddy Simulation Reynolds-number Near-wall Flows Separation Vortices Models |
| WOS ID | WOS:000418958300046 |
| Funding Organization | This work is based on the research sponsored by the National Key Research and Development Program of China (2016YFA0401200) and the National Natural Science Foundation of China (Grant Nos. 91441103, 11372330, and 11472278). The authors would like to thank the Supercomputing Center of the Chinese Academy of Sciences (SCCAA) and the Tianjin Supercomputer Center (TSC) for providing computer time. |
| Indexed By | CPCI-S ; EI |
| Language | 英语 |
| Citation statistics | |
| Document Type | 会议论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/72162 |
| Collection | 高温气体动力学国家重点实验室 |
| Corresponding Author | Yu, CP (reprint author), Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China. |
| Affiliation | 1.[Tong, Fulin 2.Duan, Yanhui] China Aerodynam Res & Dev Ctr, Computat Aerodynam Inst, Mianyang 621000, Peoples R China 3.[Tong, Fulin 4.Li, Xinliang 5.Yu, Changping] Chinese Acad Sci, Inst Mech, LHD, Beijing 100190, Peoples R China 6.[Li, Xinliang] Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| Recommended Citation GB/T 7714 | Tong FL,Li XL,Duan, Yanhui,et al. Direct numerical simulation of supersonic turbulent boundary layer subjected to a curved compression ramp[C]PHYSICS OF FLUIDS,2017. |
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| File Name/Size | DocType | Version | Access | License | ||
| Cp-2017-004.pdf（3818KB） | 会议论文 | 开放获取 | CC BY-NC-SA | View Download | ||
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