多重激波的数值模拟研究

本文用一维混合粒子模拟Code研究了包括中间激波在内的多重激波.模拟了四种情形,可以分为两类:(1)由快激波和中间激波构成的两重激波,(2)快激波、中间激波和慢激波构成的三重激波.结果表明:多重激波是不稳定的,它趋向于发展成磁流体旋转间断和MHD波,左旋圆偏振波逐渐在上游区内发展起来.文章对导致多重激波不稳定性的可能原因进行了简单的讨论.

Numerical Simulation Study for Multiple Shocks

The multiple shocks, which includes the intermediate shock wave, is studied by means of a one-dimensional hybrid particle code. Four cases are simulated, which can be classified into two types: (1) double shock composed of the fast and intermediate shock waves (Cases A and C); (2) triple shock composed of the fast, intermediate, and slow shock waves (Cases B and D). The numerical results show that the multiple shocks are unstable, and they tend to-evolve to the rotational discontinuity of the magnetic flow and MHD waves. That the left hand circular polarized wave gradually develop in the upstream region of the shock is another important feature of the results. In this paper, possible cause, which leads to instability of the multiple shocks is discussed briefly.