Novel Nonreflecting Boundary Condition for an Infinite Reservoir Based on the Scaled Boundary Finite-Element Method

摘要

The present paper deals with the hydrodynamic problems of dam-reservoir systems based on the scaled boundary FEM(SBFEM). It provides a novel boundary condition for hydrodynamic pressure simulation on the truncation boundary suited for dam-reservoir interaction analysis. A two-dimensional gravity dam-reservoir system is addressed, where the impounded water is extended to infinity. In the analysis, a truncation boundary is placed at a short distance away from the dam face in the upstream direction to reduce the computational effort. The proposed approach can conveniently consider the water compressibility, the absorption of the reservoir boundary, and the effect of the reservoir geometry. It is applicable to the earthquake excitation either in the stream direction or in the vertical/ cross-stream directions. Additionally, it has the potential to extend to the three-dimensional case. Numerical examples are provided to validate the effectiveness of the proposed approach. (C) 2014 American Society of Civil Engineers.