3D NUMERICAL SIMULATION OF FLOW AND LOCAL SCOUR AROUND A CYLINDRICAL PIER

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  • 円柱周りの流れと局所洗掘現象の3次元数値解析

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Prediction of damaging local scour around a bridge pier is considered to be of crucial importance in bridge safety. However, it is extremely difficult to solve analytically complex flow associated with local bed deformation surrounding the pier. This paper describes development of a numerical model in simulating flow and bed deformation around a cylindrical pier. The flow was calculated using 3D Reynolds-averaged Navier-Stokes equations closed with a nonlinear k-ε A turbulence model. A moving boundary-fitted coordinate system was employed to simulate the unsteady flow field bounded by movable bed surface and free water surface. The effect of nonequilibrium sediment transport was introduced in the bed-deformation model by coupling the momentum equation of sediment with stochastic models for sediment pick-up and deposition. The proposed model was tested against laboratory data for verification. The model was found to reproduce the flow and local scour geometry with reasonable accuracy.

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