卷积完全匹配层在空爆电磁脉冲2维模拟中的应用  

Application of CPML to two-dimension numerical simulation of nuclear electromagnetic pulse from air explosions

作　　者：高春霞[1] 陈雨生[2] 王良厚[1] 

机构地区：[1]防化研究院第二研究所,北京102205 [2]西北核技术研究所,陕西西安710024

出　　处：《强激光与粒子束》2005年第7期1111-1116,共6页High Power Laser and Particle Beams

基　　金：国防科技基础研究基金资助课题

摘　　要：在分析不同类型完全匹配层特点的基础上,选用了卷积形式完全匹配层(CPML)截断空中核爆电磁脉冲数值模拟的开放边界。从自由空间中电磁波的平面波解和分裂形式的完全匹配层出发,构造了未分裂形式的完全匹配层,应用傅里叶变换的卷积定理,推导出2维旋转椭球-双曲正交坐标系下卷积形式完全匹配层介质中电磁场的迭代形式的离散方程。计算表明,采用CPML吸收边界方法使得截断的外边界处的场的计算误差大大减少。The characteristics of different types of MPL were analyzed and the convolutional PML was chosen to truncate the open boundaries in numerical simulation of nuclear electromagnetic pulse from air explosions. On the basis of the split-field PML and the plane-wave solution of electromagnetic field in free space, the unsplit-field PML was constructed. By applying the convolutional theorem of Fourier transform, the discrete iterative equations of electromagnetic field components were presented in the CPML media under the two-dimension prolate-spheroidal coordinate system. The numerical results indicate that the method of CPML can largely decrease calculation errors of boundary fields.

关 键 词：卷积完全匹配层(CPML) 时域有限差分 电磁脉冲 核爆炸 截断 

分 类 号：O241[理学—计算数学]