Sliding interface processing in simulation on magnetically driving high speed flyer
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摘要: 在二维单介质磁驱动数值模拟程序（MDSC2）的基础上，采用局部结构整体非结构的网格拼接方法，研制了处理滑移界面的二维多介质程序。二维多介质程序解决了单介质程序无法处理的电极与飞片之间相互作用的模拟问题，能更准确地模拟磁驱动发射实验的飞片状态。计算结果表明：发射飞片的自由面部分始终保持固体密度状态；自由面速度历史和VISAR测量的速度曲线相吻合；飞片中间部分在电流加载过程中始终具有良好的平面性，飞片两端出现拖尾质量，产生不稳定性，这是由于飞片两端与飞片中间部分的磁场强度分布不同造成的。Abstract: The flyer plates and the electrodes interact in the emission experiment of high-speed magnetically accelerated flyer plates. The area surrounding the flyer plates and electrodes should be considered in numerical simulation. Hence, a two-dimensional multimedia code is developed on the basis of MDSC2 and numerical simulation of the magnetically accelerated flyer plates is conducted. The results show that the solid density is constantly kept in the free surface of the flyer plates; the speed history of the free surface matches the experimental records by velocity interferometry system for any reflector (VISAR). The middle of the flyer plates keeps a good degree of planarity in the loading procedure of electric currents while the tailing mass at the two ends of the flyer plates is unstable because of the distinguished magnetic strengths between the ends and the middle of the flyer plates.
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