報告題目：Numerical simulation of shock/turbulent boundary layer interactions
報告時間：4月30日（星期三）上午9:30-11:30
報告地點：玉泉校區(qū)教5-333
報 告 人：英國University of the West of England姚宇峰教授
Dr Yufeng Yao is currently Professor in Aerospace Engineering at University of the West of England (UWE). At UWE, He has established and now head Engineering Modelling and Simulation research group which explores complex engineering design, analysis and control relevant issues occurred in practical engineering systems. He is also Director of UWE’s continuing professional development in aerospace (CPDA) which was a joint venue between UWE and Bristol University aiming for providing further professional training for company staff such as Airbus, Rolls-Royce, and GE, among many others. Prof Yao now also holds a Chair position at School of Aeronautics and Astronautics, Zhejiang University sponsored by the Zhejiang Province 1000 plan (Haiou Scheme).
Dr Yao is Fellow of Royal Aeronautical Society, Associate Fellow of American Institute of Aeronautics and Astronautics, Member of American Society of Mechanical Engineers.
Dr Yao’s research interest includes direct and large-eddy simulations of turbulent flow in complex geometries, transitional turbulent flow in shock/boundary-layer interactions and the RANS modelling of single- and multi-phase flows and heat transfer for industrial applications such as turbo-machinery, automotive and built environment.
Further information can be found from two Web links as:
http://people.uwe.ac.uk/Pages/person.aspx?accountname=campus%5Cy-yao
報告簡介：
The influence of numerical dissipation on direct numerical simulation (DNS) of decaying isotropic turbulence at initial is investigated respectively by using a 7th-order low-dissipation monotonicity-preserving (MP7-LD) scheme with different levels of bandwidth dissipation. It is found that for both benchmark test cases, small-scale turbulence fluctuations can be largely suppressed by high level of scheme dissipation, while numerical errors in terms of high-frequency oscillations appear and could destabilize the computation if the dissipation is reduced to a very low level. Numerical studies show that reducing the bandwidth dissipation to 70% of the conventional 7th-order upwind scheme can maximize the efficiency of the MP7-LD scheme in resolving small-scale turbulent fluctuations and, in the meantime preventing the accumulation of non-physical numerical errors. By using the optimized MP7-LD scheme, DNS of an impinging oblique shock-wave interacting with a spatially-developing turbulent boundary layer is conducted at incoming free-stream Mach number of 2.25 and shock angle of 33.2 degrees. Simulation results of mean velocity profiles, wall surface pressure, skin friction and Reynolds stresses are systematically validated against available experimental data and other DNS predictions in both the undisturbed equilibrium turbulent boundary layer region and the interaction zone, and good agreements have been achieved. This study demonstrates the capability of the optimized MP7-LD scheme for DNS of complex flow problems of wall-bounded turbulent flow interacting with shock-waves.
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