Simulations are performed to investigate gravity currents in the presence of free surface waves using the open-source computational fluid dynamics programme REEF3D with the concentration equation, and the large eddy simulation model for turbulence closure. Simulations show that the period of the oscillation front relates only to the period of the incident waves and the oscillation amplitude increases with wave height. The average velocity of the density current increases with increasing wave height and wavelength. The surface waves change the generation position and combination direction of the turbulence structures in the pycnocline. The oscillatory motion of the waves stabilizes the pycnocline earlier and reduces the turbulent mixing. The instability zone is reduced faster with higher wave heights with well-ordered K-H billows, but not for longer wavelengths. The instantaneous velocity and concentration fields are highly influenced by the incident wave characteristics when compared to that in the absence of waves.

使用带有浓度方程的开源计算流体动力学程序 REEF3D 和湍流闭合的大涡模拟模型，进行模拟以研究存在自由表面波的重力流。仿真结果表明，振荡波前的周期只与入射波的周期有关，并且振荡幅度随波高的增加而增加。密度流的平均速度随着波高和波长的增加而增加。面波改变了浓跃层中湍流结构的产生位置和组合方向。波浪的振荡运动更早地稳定了重跃层并减少了湍流混合。具有良好有序 KH 波浪的波高越高，不稳定区减少得越快，但不适用于更长的波长。与没有波的情况相比，瞬时速度场和浓度场受入射波特性的影响很大。