Three-dimensional numerical simulation of flow in continuous bend under the influence of piers

Abstract

With the development of social economy, more and more cities plan to build various kinds of Bridges in curved rivers to construct urban traffic network. The Realizable k-ε turbulence model and VOF method were used to capture the free water surface, Simple algorithm was used for coupling calculation to simulate the flow characteristics of continuous bend with piers placed at 45° forward bend section. Simulation results show that: (1) under the condition of continuous curve, set in the horizontal surface slope will change the channel distribution of piers, bridge piers and curve superposition, the piers downstream transverse surface slope significantly improved, but the bridge pier near area, on the other hand, because of the water resistance of piers, bridge pier influence and affect the part of the balance of the bend, transverse surface slope value is only under the condition of no pier 1/2;(2) The high longitudinal flow velocity area is more concentrated, the high velocity center moves down to the bottom of the channel, and the central position of the circulation structure moves to the convex bank, which can aggravate the scouring of the convex bank.