The Numerical Simulation Of Flow And River Bed Erosion And Deposition For North Long Bench On Yellow River

In this paper,the water flow, sediment transport and river bed deformation in typical bend are measured, analyzed and studied by numerical simulation located at the junction of the Yellow River in the Ningxia Hui Autonomous Region River North Long Bench.The acoustic Doppler profiler, RTK,3D laser scanners on the the Yellow River river north of long beach section for setting and flow velocity, bed elevation, sediment particle size data measured work. Using various drawing methods of the measured section of river bottom elevation and section vertical to the average velocity of the curve fitting analysis of riverbed shape and fracture flow velocity; on the measured cross-section velocity distribution for the drawing, analysis of the mainstream distribution on the cross section; to 2010,2011 and 2012 at the bottom of the river bed elevation fitting, analyzes the deformation state of riverbed in the years and cause of formation.For uses based on the improved model for k -εunstructured grid turbulence on the North Long Bench reach the establishment of 3D flow and sediment mathematical model, detailing the Delauray triangular mesh generation method and the implementation method, and encryption for the grid. The finite volume method (FVM) is used to discrete the general equations, and the SIMPLEC algorithm is implemented in the unstructured grid. The implementation steps of the TDMA algorithm are introduced.Based on RNGk-s model of Long Beach, north of the Yellow River typical of bend flow, sediment transport, river bed deformation were simulated using. The simulated results and the measured data were compared and analyzed, comparing the results satisfactory, that established RNG k-ε mathematical model and the algorithm is reasonable and effective, can be more accurately to long beach, north of the Yellow River, the typical bend flow, bed deformation simulate the situation, and for the future of the river state can predict job; high and low convex concave curve surfacephenomenon exists in corners, with water surface transverse slope.In the simulation results can reflect the. In the simulation of the flow field in the bend flow field can be very good simulation of the two flow phenomenon, and can reflect the mainstream of the curve with the centrifugal force effect of the phenomenon of deviation.