A novel implicit time-domain boundary-integral/finite-element algorithm for computing transient electromagnetic field coupling to a metallic enclosure

A time-domain boundary-integral/finite-element algorithm for transient electromagnetic field coupling into an enclosure (cavity) is developed. The model is based on a finite-element technique, which is coupled to the exterior region through the H-field integral equation directly in the time domain. The global electric field, throughout the interior region is driven by the tangential magnetic field over the outer surface of the enclosure. The tangential magnetic field, in turn, is related to the time-dependent incident pulsed field, and the tangential electric field over the surface of the enclosure. Hence, the electric and magnetic fields are coupled at the surface of the enclosure; the coupled equations are solved by a leap-frogging technique. Numerical based on the time-dependent finite-element/boundary-integral implicit scheme are compared with measurements. Some novel features of the newly developed algorithm are also presented