计算物理 ›› 2014, Vol. 31 ›› Issue (6): 659-667.

• 论文 • 上一篇    下一篇

理想磁流体中激波与矩形密度界面相互作用的数值研究

李源, 罗喜胜   

  1. 中国科学技术大学近代力学系先进推进实验室, 合肥 230026
  • 收稿日期:2013-10-28 修回日期:2014-02-01 出版日期:2014-11-25 发布日期:2014-11-25
  • 通讯作者: 罗喜胜,E-mail:xluo@ustc.edu.cn
  • 作者简介:李源(1990-),男,硕士生,从事磁流体界面不稳定性研究,E-mail:yuli@mail.ustc.edu.cn

Numerical Study of Shock Interactions with Rectangular Density Interface in Magnetohydrodynamics

LI Yuan, LUO Xisheng   

  1. Advanced Propulsion Laboratory, University of Science and Technology of China, Hefei 230026, China
  • Received:2013-10-28 Revised:2014-02-01 Online:2014-11-25 Published:2014-11-25

摘要: 发展一套采用三阶WENO格式和混合GLM方法的理想磁流体数值方法,并对激波与矩形密度界面相互作用进行数值研究.通过圆极化阿尔芬波和旋转激波管问题对数值方法的稳定性和可靠性进行验证.在入射激波马赫数为10,界面内外气体密度比为10的情况,对比不同磁场中矩形密度界面的演变过程.结果表明,磁场能够减少界面上涡量的生成从而抑制界面不稳定性,并且磁场对界面的加速过程以及界面内外气体混合率有影响;而界面的存在将会使波后部分区域磁场增强;由于尖角的存在,矩形界面的发展与圆形界面不同.

关键词: 磁流体, 矩形界面, 激波, 不稳定性

Abstract: A magnetohydrodynamic simulation method is developed for shock interacting with rectangular density interface in a magnetic field. The method employs 3rd WENO scheme and mixed GLM method. With circular polarized Alfvén wave propagation test and rotated shock tube problem,the method is validated. Under conditions that Mach number of shock is 10 and ratio of density of cloud to ambient gas is 10,evolutions of shocked interface in different initial orientations and strengths of magnetic field are compared.It shows that magnetic field decreases vorticity formed on surface and reduces growth of hydrodynamic instabilities; Field influences acceleration and mixing rate of cloud; And field is greatly amplified in some regions behind shock when cloud is presented. It is also found that,due to sharp corner,evolution of rectangular interface is different from circular one.

Key words: magnetohydrodynamics, rectangular interface, shock wave, instability

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