NUMERICAL SIMULATION OF UNSTEADY FLOW IN LONG-DISTANCE WATER-TRANSFER PROJECT WITH MULTI-STRUCTURES

摘要

Numerical simulation of unsteady flow in long-distance water-transfer project with multi-structures is illustrated in this paper. Variable steps in time/space and continuous computation involving the inner boundary conditions are used to simulate the step-type flow and long-distance waterway with multi-structures. Utilizing the function of man-machine interaction and the automatical state-identification of sub-system, the operator of projects can give the model a set of instructions, which can automatically identify the flow state of sub-systems and quickly feed back the simulation result. Different operation schemes can be compared each other with little time and cost consumption. The model is verified with the field data of the Luanhe-Tianjin water-transfer Project with a distance of more than 100km from Yu-Qiao reservoir located in Luanhe River to Da-Zhang-Zhuang pump station in Tianjin, China, along with many hydraulic structures such as pump stations, inverted siphons, flumes, sluices and etc. The relative error between numerical computation and field measurement varies within 1～3% which shows an excellent agreement.