Numerical Simulation of Cylindrical Interface Instability by Using Multicomponent Gas Kinetic Scheme
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摘要: 在假定单元内各组分同温同速的条件下，采用气体动理学格式(Gas-Kinetic Scheme，GKS)对空气/He和空气/R22圆柱界面不稳定性进行了数值计算，得到不同时刻的密度分布以及界面上特征位置的位移历史和平均速度。当激波穿过界面后，界面上特征位置的位移随时间逐渐增大，特征位置的平均速度与前人的实验结果和数值模拟结果吻合很好。对比结果表明，从微观气体运动角度出发的GKS方法对于界面不稳定性问题具有良好的模拟能力。Abstract: Air/He and air/R22 cylindrical interface instabilities were calculated by gas kinetic scheme (GKS) under the assumption that the components have the same temperature and velocity in the cell.The density distributions at different time, the displacement histories and the average velocity of characteristic points at the interface were obtained.The displacements of characteristic points increased with time gradually when the shock wave passed through the interface.The average velocities of characteristic points agreed with the results of previous experiments and numerical simulations very well.The comparisons between the simulation results and literature data suggest that the GKS which is based on the particles movement has a good simulation performance for the cylindrical interface instability.
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图 4 空气/He界面特征位置的位移历史
Figure 4. Displacement history of the characteristic points at the air/He interface
图 7 空气/R22界面特征位置的位移历史
Figure 7. Displacement histories of the characteristic points at the air/R22 interface
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