椭圆余弦内波及其对墩柱作用数值模拟

Numerical simulation of internal cnoidal waves and their actions on piers

基于FLUENT软件建立数值波浪水槽,研究椭圆余弦内波及其对墩柱的作用。椭圆余弦内波的生成采用推板造波方法,自由面捕获采用VOF方法。首先,模拟了椭圆余弦内波的生成,比较了不同周期和波高下椭圆余弦内波的波浪形态。然后,在特定的周期和波高条件下模拟了三维椭圆余弦内波对单个墩柱及多个敦柱的作用;分析了各墩柱上受到的惯性力和粘性力的变化趋势,并对不同墩柱下的总波浪力进行了对比;得出了墩柱上受到的波浪力也呈现周期性变化并且在波浪前进方向上后墩柱的受力小于靠前墩柱的结论。

Internal cnoidal waves and their actions on the piers are investigated by building numerical wave tank based on FLUENT software,in which the internal cnoidal waves are generated by push-pedal method and the free surface is captured by VOF method.Firstly,the generation of internal cnoidal waves is simulated and the resulting wave shapes with different amplitudes and different periods are compared.And then,the three dimensional numerical simulations of the actions of the internal cnoidal wave on different kinds of piers are made by choosing the wave with specific period and amplitude;the inertia force and the viscous force on the piers and their tendency are obtained and analyzed;and the total wave force on different piers are compared.It is found that the forces on piers are also periodically changed as the internal cnoidal waves propagate and the forces on the later piers are less than the former ones along the wave direction.