大型水平极化电磁脉冲有界波模拟器的并行模拟分析

采用将大地设置为均匀有耗介质，并用单轴完全匹配层（UPML）吸收边界截断的方式，对离散电阻加载的地面上方大型水平极化电磁脉冲（EMP）有界波模拟器的时域辐射场进行并行时域有限差分模拟.给出大地电导率和相对介电常数及模拟器圆锥的锥半径不同时模拟器辐射场的时域波形，分析三者对辐射场的影响，并给出模拟器内有10 m长的效应物时耦合场的时域波形.并行模拟时，计算网格总数达18亿.研究表明：大地相对介电常数和电导率越大，近地面测点接收到的地面反射作用越大；测点场的峰值受锥半径的影响最大，且随着锥半径的增大，同一水平面内的场也越不均匀；对地面上方1 m处的几个测点，其脉冲峰值及半高宽受地面反射及地面损耗的影响较大，而地面上方5 m处的几个测点则受地面影响较小；当效应物开孔位置位于模拟器场泄露一侧时耦合进入圆筒内的电磁波能量较多.

Parallel Simulation and Analysis of Large EMP Bounded Wave Simulator with Horizontal Polarization

Parallel FDTD method is used in time-domain simulation of large horizontally polarized electromagnetic pulse(EMP) bounded wave simulator with discrete resistors, in which the earth is set as lossy media truncated by uniaxial perfectly matched layer (UPML) absorbing boundary. Simulator's radiation fields in time-domain with different earth conductivity, earth relative dielectric constant and cone's radius are given. And electric field with a 10 m-length cylinder effector in simulator is also presented. The number of total cells in parallelized FDTD computing is about 1.8 billion. It shows that reflection from the earth becomes great as the earth's dielectric constant or conductivity increasing; The cone's radius has great effect on peak value of E-field in simulator, and fields at same horizontal plane becomes uneven as the radius becomes large; Reflection and loss from the earth have great effect on peak value and pulse width of E-fields in a horizontal plan above the ground 1 m, while they have little effect on E-fields in a horizontal plan above the ground 5 m. Energy entering into effector through a square hole is great as the hole is at the same side of simulator fields' leak.