CFD技术在目标电磁特性计算中的应用

电磁学中麦克斯韦方程组和流体力学中无粘流动欧拉方程一样,都是具有实特征值的双曲型偏微分方程组,相同的数学特性使得计算流体力学(CFD)技术能够在计算电磁学(CEM)中得以应用。采用MUSCL格式结合Steger-Warming分裂计算电磁通量,采用4阶Runge-Kutta法计算非定常时间推进,借鉴CFD方法计算电磁场边界条件;采用时域有限体积法(FVTD)数值模拟宽带脉冲波、完全导电体、含吸波材料涂层介质/金属混合体以及复杂外形目标的电磁散射。结果表明:基于CFD的FVTD方法能够高精度地计算目标的电磁特性。

Application of CFD Techniques on Numerical Computaion of Objects Electromagnetic Characteristic

Maxwell equations of electromagnetism are hyperbolic partial differential equations with real characteristic values as the non-viscous Euler equations of hydrodynamics, so the same mathematical characteristic makes it possible to apply computational fluid dynamics (CFD) techniques into computational electromagnetism (CEM) to get high precision electromagnetic fields. The finite volume time domain method (FVTD) is used in this paper, where flux vector computed by MUCSL scheme and Steger-Warming splitting method, unsteady time marching computed by 4 steps Runge-Kutta method, and the treatment of electromagnetic boundary conditions using the same techniques as in CFD. In the end, through the numerical simulation of electromagnetic scattering of wideband pulse wave, perfect conductor, media coated conductor and complex shape objects, it demonstrated that FVTD method based on CFD can calculate objects electromagnetic characteristic with a better precision.