Resumen de Implementation of surface impedance boundary conditions in the cell method via the vector fitting technique

P. Alotto, André De Cian, G. Molinari, M. Rossi

• Purpose – To show a possible implementation of surface impedance boundary conditions (SIBCs) in a time domain formulation based on the cell method (CM).

  Design/methodology/approach – The implementation is based on vector fitting (VF), a technique which allows a time domain representation of a rational approximation of the surface impedance to be found.

  Findings – It is shown that very little computational effort is needed to find a very good VF approximation of simple SIBCs and that such approximation is easily fitted into existing CM codes.

  Research limitations/implications – The extension to higher order SIBCs has not been taken into account.

  Practical implications – The proposed approach avoids the use of convolution integrals, is accurate and easy to implement.

  Originality/value – This paper introduces the use of VF for the approximate time domain representation of SIBCs.