A finite-difference time-domain approach for three-dimensional transient electromagnetic response of topographic distortions
We have developed a finite-difference time-domain approach for three-dimensional transient electromagnetic response. The purpose of the approach is the simulation of both electric fields and the magnetic fields generated by a rectangular loop on a uniform earth with rugged surface. Using a staggered grid and the modified DuFortFrankel method, the approach steps Maxwells equations in time. A divergence-free condition is enforced for the magnetic field, providing accurate results at late times. The value of current pulse from the transmitting loop is added to ex and ey at a certain point as a soft source. The domain boundaries in air are deal with by perfectly matched layer conditions,and the boundary in the earth are still imposed by a homogeneous Dirichlet condition. Numerical checks against analytical resolution for a horizontal uniform earth prove that the solution provides accurate results and the checks against practical data from rugged terrain show that the induced electromotive forces is opposed to the landform and the topographic effect really exists and could not be ignored.
Finite difference time-domain method three-dimensional transient electromagnetic response topographicdistortions soft source boundary conditions
YAN Shu SHI Hongbei SHI Xianxin CHEN Mingsheng
School of Computer Science and Telecommunication Engineering,Jiangsu University, Zhenjiang, China Xian Branch, China Coal Research Institute, Xian, China
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
614-619
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）