Research On Key Technique Of Numerical Simulation In Flow Movement Around Dike-spur

Key technique on numerical simulation, including two and three dimensional simulation, for the flow around spur-dikes which commonly applied in navigation engineering are studied in this paper.In 2-D mathmatical model, the mothod, gird-interface-depth, was presented for depth-break around submerged spur-dikes. In order to test and verify the mothod, five submerged spur-dikes experiment was simulated, the agreement with the measurements was generally good. The mathematical model was applied to severce the navigation engineering projects with advantage that can adopt gird to the project flexibly.In 3-D mathmatical model, the second-order Reynolds stress tensor in Reynolds equations were simulated according to the k -εturbulence model. Free water surface was decided by method nesting between 2-D and 3-D. The method, unchangeable layers adding changeable layer was presented to simulate fluctuation of water surface. SIMPLER algorithm was applied to slove the strongly coupled system of the discretized equations derivation with the control volume method. The computational data was in reasonable agreement with experiment data during simulating non-submerged spur-dike, submerged spur-dike and non-submerged spur-dikes.The hydrodynamic equations adopted the curvilinear coordinates system in plain and the Z coordinate system in vertical direction. Free water surface was decided by method nesting between 2-D and 3-D. The method, unchangeable layers adding changeable layer was presented to simulate fluctuation of water surface. Condensation technique was adopted to solve unregulated boundary. SIMPLER algorithm was applied to slove the discretized equations derivation with the control volume method. 3-D flow field in the Anqing river beach was obtained, and was in reasonable agreement with filed data. Based on this, the effects on navigation project to river flow were computed and analysed.