Numerical Simulation Of Forces Of Waves And Wave Flow Superposition To A Gear-type Mixture Embankment

The gear-type mixture embankment is a kind of new structure,which was used between Taicang and Nantong in the first-stage deep water channel project from Nanjing to the estuary in the Yangtze River.It is still in the early stages of application and research.The theoretical or empirical formula for the wave force of the composite dam is still needed to be further verified.Furthermore there is not clearly understood of distribution of pressure on the gear-type component and the change of the flow field near the the gear-type component.Therefore,in order to popularize the new structure,it is necessary to deeply study the mechanical properties of the mixed structure under the action of wave flow and the influence of the mixed embankment on the wave flow field.A three-dimensional numerical wave pool is built to simulate the interaction between waves and the gear-type mixture embankment based on the flow dynamics software Flow3 D.The model uses TruVOF method for free surface tracing,and uses the slope pore structure and the outflow boundary to eliminate the wave.It has been validated that the model can simulate the three-dimensional wave propagation well which has good wave-making and wave-eliminating.The wave forces acting on the gear-type mixture embankment are extracted and compared with the wave forces calculated by the theoretical formula.At the same time,the free surface and the flow field of the waves are analyzed on the periodic nodes of wave forces.The results show that the three-dimensional numerical wave model can accurately calculate the wave force acting on the gear-type mixture embankment,and can well simulate the variation of the wave-surface flow and the pressure acting on the surface of the gear-type mixture embankment.In order to further understand the mechanical behavior of the gear-type mixture embankment under wave action,a single variable method is used to numerically simulate the wave induced waves at different wave heights,different wavelengths and different water depths.And analyze the impact of these factors on wave force of the gear-type mixture embankment.The results show that the maximum value of positive wave force increases with wave height and wave length.When the water depth is less than the depth,the maximum value of X positive wave force of mixture embankment increases with the depth of water And when the water depth is exceeded,the maximum value of X positive wave force decreases with the increase of water depth.This component is applied to the tidal estuary to the overflow region of the runoff,simulating the force characteristics of the mixture component under the superposition of wave and current,extracting the wave force on the mixture component,and discussing superposition mode of the wave effect and the water flow.The results show that the 3D numerical simulation results can provide some reference for the calculation of the wave-water force of the mixture members.