A Modified Liao´s Absorbing Boundary Condition for FDTD Simulations in 2-D Cylindrical Coordinates with Rotational Symmetry

A modified Liao´s absorbing boundary condition (ABC) for finite-difference time-domain (FDTD) simulations in 2-D cylindrical coordinates with rotational A modified Liao´s absorbing boundary condition (ABC) for finite-difference time-domain (FDTD) simulations in 2-D cylindrical coordinates with rotational symmetry is presented in this paper. Like the ordinary Liao´s ABC that was used in Cartesian coordinates, the modified Liao´s ABC is easy to implement even near the corners of a computation grid. Further more, the presented Liao´s ABC does not encounter stable problem. A numerical example is given to validate the introduced ABC.symmetry is presented in this paper. Like the ordinary Liao´s ABC that was used in Cartesian coordinates, the modified Liao´s ABC is easy to implement even near the corners of a computation grid. Further more, the presented Liao´s ABC does not encounter stable problem. A numerical example is given to validate the introduced ABC.