Parallel computing numerical model for one-dimensional unsteady flow of plain river network
1. Key Laboratory of Coastal Disastcrs and Dcfencc, Ministry of Education, Hohai University, Nanjing, Jiangsu 210098, China; 2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, Jiangsu 210098, China; 3. Department of Hydraulic Engineering, Zhejiang Water Conservancy and Hydropowcr College, Hangzhou, Zhejiang 310018, China; 4. Water Resource Development Research Center of Taihu Basin Authority, Shanghai 200434, China; 5. Runzhou Water Conservancy Bureau of Zhenjiang City, Zhenjiang, Jiangsu 212005, China）
Abstract：The Preissman four-point implicit difference scheme discrete equations for one-dimensional river, parallel algorithm is used to solve the node equations for water level calculation, which is very time-consuming. Parallel algorithm can effectively reduce the computation time. Since the current parallel programming platforms could not guarantee the correct solution of the problem during the process migration and network exceptions, a parallel communications platform is developed to meet the need for parallel computing model. The relevant internal communication protocols are formulated. The numerical simulation is carried out on river section in Pudong, Shanghai as an example. The results show that when the river is in a static status, a number of optimal clients exist. When the number of client is less than the optimal number, the parallel algorithm requires less time than the serial algorithm, and the required time gradually reduces with the increase of the number of clients. Otherwise, the required time for computation gradually increases.
2009, Vol. 30 
