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Direct numerical simulation of shock/turbulent boundary layer interaction in a supersonic compression ramp

Science china(Physics,mechanics & Astronomy) 2010年第9期53卷 1651-1658页

作者： li xinliang1,fu dexun2.ma yanwen2.& liang xian1 1 key laboratory of high temperature gas dynamics,institute of mechanics,chinese academy of sciences,beijing 100190,china 2 The State key laboratory of Nonlinear mechanics,institute of mechanics,chinese academy of sciences,beijing 100190,china 1. key laboratory of high temperature gas dynamics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China2. The State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China

A direct numerical simulation of the shock/turbulent boundary layer interaction flow in a supersonic 24-degree compression ramp is conducted with the free stream mach number *** blow-and-suction disturbance in the upstream wall boundary is used to trigger the *** the mean wall pressure and the velocity profiles agree with those of the experimental data,which validates the *** turbulent kinetic energy budget in the separation region is *** show that the turbulent production term increases fast in the separation region,while the turbulent dissipation term reaches its peak in the near-wall *** turbulent transport term contributes to the balance of the turbulent conduction and turbulent *** on the analysis of instantaneous pressure in the downstream region of the mean shock and that in the separation bubble,the authors suggest that the low frequency oscillation of the shock is not caused by the upstream turbulent disturbance,but rather the instability of separation bubble.

关键词： compression ramp shock/turbulent boundary layer interaction direct numerical simulation shock oscillation

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Complex Transition of Double-Diffusive Convection in a Rectangular Enclosure with Height-to-Length Ratio Equal to 4: Part I

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Communications in Computational Physics 2009年第7期6卷 247-268页

作者： xian liang xinliang li dexun fu yanwen ma Shanghai institute of Applied mathematics and mechanics Shanghai UniversityNo.149 Yanchang RoadShanghai 200072China LNM Institute of MechanicsChinese Academy of SciencesNo.15 Beisihuanxi RoadBeijing 100190China

This is the first part of direct numerical simulation(DNS)of double-diffusive convection in a slim rectangular enclosure with horizontal temperature and concentration *** consider the case with the thermal Rayleigh number of 105,the Pradtle number of 1,the Lewis number of 2,the buoyancy ratio of composition to temperature being in the range of[0,1],and height-to-width aspect ration of 4.A new 7thorder upwind compact scheme was developed for approximation of convective terms,and a three-stage third-order Runge-Kutta method was employed for time *** DNS suggests that with the buoyancy ratio increasing form 0 to 1,the flow of transition is a complex series changing from the steady to periodic,chaotic,periodic,quasi-periodic,and finally back to *** are two types of periodic flow,one is simple periodic flow with single fundamental frequency(FF),and another is complex periodic flow with multiple *** process is illustrated by using time-velocity histories,Fourier frequency spectrum analysis and the phase-space trajectories.

关键词： Double diffusive convection transition periodic motion chaotic motion high order compact

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