Publications Details
A method for computing fields near the origin of a cylindrical coordinate system in time domain finite-difference electromagnetic simulations
One problem with electromagnetic time domain finite-difference simulations in cylindrical coordinates is the rapidly decreasing characteristic dimension of the cells as r approaches zero. In order to satisfy the Courant stability condition a small time step is needed to insure stability, which is undesirable because it increases the cost of the simulation. In our presentation, we will describe a method which uses a rectangular grid and an annular cylindrical grid which overlap to perform electromagnetic simulations of cylindrical geometries. The two grids are connected by interpolating the field at the grid points of one grid using field values from the second grid. 2 refs.