Abstract
To solve scattering problems with multi-transmitting boundary, we present an improved wave motion input method based on the idea that error caused by the difference between incident wave field used in calculation and waves propagating in finite element grids can be eliminated to suppress drift instability. In this method, a calculation scheme is proposed to obtain the numerical solution of incident wave field, which establishes boundary region models with the multi-transmitting boundary. Numerical experiments demonstrate that this improved wave motion input method not only eliminates drift instability but also effectively improves the calculation accuracy of low-frequency components. Furthermore, the method is easy to implement and, unlike other approaches, does not need artificial parameters. Thus, this method is proposed for use in wave scattering simulation such as seismic response analyses of structures, particularly for long-period structures and those that are sensitive to low frequency.
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