A finite element formulation for wave propagation in an unbounded problem domain necessitates the development of a transmitting boundary condition. Based on an analytical study of wave propagation in a saturated poroelastic medium, a frequency dependent absorbing boundary condition which is local in space can be obtained at the expense of spurious reflections for oblique incident waves. Reflection curves are presented for different kinds of incident waves and dimensionless frequencies for varying angles of incidence. Alternatively, the effective energy ratio allows to define a measure for the overall efficiency of the absorbing boundary condition. A numerical example reveals good wave absorbing capabilities of the transmitting boundary condition and encourages its implementation in a finite element formulation.
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