A study of the accuracy in FDTD algorithm for solving EM field with rotating body

In this paper, FDTD method combined with Overset Grid Generation method is proposed to the analysis of the EM fields around a rotating body. We have previously proposed this numerical approach for a stationary and uniformly moving body. Lorentz transformation is combined to the analysis to comprise with the high relative velocities. The results of the numerical analysis show the modulations of the observed waveform when the incident wave hits the rotating body. The relativistic effects and its influence to the EM waveforms are presented. The modulations of EM fields in different radius length of observation point are also shown. The observed EM waveforms are compared with the theoretical results and achieved good agreements in high relative velocities, up to ν = 0.7c closed with the finite speed of light.