Abstract
A description is given of the computer code URMEL-I which calculates the impedance of cylindrically symmetric obstacles of arbitrary shape with open side tubes. This code is specifically designed for the impedance calculation above cutoff where existing resonator codes cannot be used. The numerical solution is based on the FFT (finite Fourier transform) method, a finite-difference method. It requires the solution of a large, inhomogeneous, complex matrix equation for a given frequency. A multigrid algorithm has been set up to solve the linear system which is non-Hermitian and indefinite. The special solver is described, and results for different resonators are presented. >
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