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Mathematical Problems in Engineering
Volume 2011 (2011), Article ID 210624, 23 pages
http://dx.doi.org/10.1155/2011/210624
Research Article

Finite Element Analysis of Dam-Reservoir Interaction Using High-Order Doubly Asymptotic Open Boundary

1State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
2Changjiang Institute of Survey, Planning, Design, and Research, Wuhan 430010, China

Received 30 May 2011; Accepted 23 August 2011

Academic Editor: Otto von Estorff

Copyright © 2011 Yichao Gao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The dam-reservoir system is divided into the near field modeled by the finite element method, and the far field modeled by the excellent high-order doubly asymptotic open boundary (DAOB). Direct and partitioned coupled methods are developed for the analysis of dam-reservoir system. In the direct coupled method, a symmetric monolithic governing equation is formulated by incorporating the DAOB with the finite element equation and solved using the standard time-integration methods. In contrast, the near-field finite element equation and the far-field DAOB condition are separately solved in the partitioned coupled methodm, and coupling is achieved by applying the interaction force on the truncated boundary. To improve its numerical stability and accuracy, an iteration strategy is employed to obtain the solution of each step. Both coupled methods are implemented on the open-source finite element code OpenSees. Numerical examples are employed to demonstrate the performance of these two proposed methods.