Constrained large-eddy simulation of supersonic turbulent boundary layer over a compression ramp |
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| Authors: | Liang Chen Yipeng Shi Shiyi Chen |
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| Affiliation: | 1. State Key Laboratory for Turbulence and Complex Systems, College of Engineering, Peking University, Beijing, P. R. China;2. HEDPS and Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing, P. R. China;3. Beijing Innovation Center for Engineering Science and Advanced Technology, Peking University, Beijing, P. R. China;4. Department of Mechanics and Aerospace Engineering, South University of Science and Technology of China, Shenzhen, Guangdong, P. R. China |
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| Abstract: | A supersonic turbulent boundary layer over a compression ramp is numerically investigated using the constrained large-eddy simulation (CLES) method. The compression corner is characterised by a deflection angle of 24°. The free-stream Mach number is Ma∞ = 2.9, and the Reynolds number based on the momentum thickness of inlet boundary layer is Reθ = 2300. The mean and statistical quantities, such as mean velocity, wall pressure and Reynolds stresses, are thoroughly analysed and compared with those from traditional large-eddy simulation (LES), experimental measurement and direct numerical simulation (DNS). It turns out that CLES can predict the friction coefficient, wall-pressure distribution, size of separation bubble, Reynolds stresses, etc. more accurately than traditional LES, and the results are in reasonable agreement with the experimental and/or DNS data. Also discussed are the effects of specific parameterisations of the Reynolds constraint and interfacial positions separating the constrained and unconstrained regions on the performance of the CLES method. |
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| Keywords: | Supersonic turbulent boundary layer compression ramp CLES LES |
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