The spatial and temporal staggered grid formulation of CEFIT produces a very stable and efficient numerical code. The implementation of boundary conditions at inner and outer boundaries of the model is much easier than in standard FD schemes using non-staggered grids. With CEFIT, axisymmetric three-dimensional problems can be treated in a two-dimensional rectangular grid in the (r,z)-halfplane. The good agreement between theory and numerical calculations demonstrates the accuracy of the numerical code. Further fields of application not presented here are waves in acoustic microscopes, simulation of impact-echo measurements in multi-layer systems and axisymmetric wave propagation in arbitrary bodies of revolution.
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