Effects of stability factor on FDTD numerical calculation
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摘要: 讨论了FDTD(Finite-Difference Time-Domain)迭代计算中稳定因子的作用.推导了含有稳定因子的二阶Mur条件修正式,并以线源为例研究了稳定因子对吸收边界性能以及数值稳定性的影响.在三维计算空间中以软激励源形式加入平面波,计算了稳定因子不同时散射场区的RCS以及收敛性能的变化,结果表明在满足数值稳定条件的前提下,增加时间步长对计算更为有利.Abstract: The function of stability factor was discussed in FDTD calculation. Modification formula of two-order Mur condition including stability factor was derived. Taking example for line source, effects of stability factor on absorbing boundary capability and numerical stability were studied. Plane wave was added to three-dimensional calculation space as soft excitation source. The variety of RCS and convergence performance with stability factor was computed. Results show that increasing temporal increment is favorable when satisfying numerical stability condition.
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Key words:
- stability factor /
- stability condition /
- finite-difference time-domain
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