两层粘性流体中运动球体尾流的数值模拟

The Numerical Simulation for Waves Generated by a Moving Body in a Viscous Two-layer Fluid

采用求解Navier-Stokes方程的方法,研究了有限深两层粘性流体中定常运动球体激发波动的问题.基于体积分数方法,成功地数值模拟了球体运动在自由面和内界面上激发尾迹的特征,揭示了Froude数、密度比和潜深对自由面和内界面尾迹的波系分布和波形结构的影响.结果表明,采用计算流体力学手段预报运动潜体粘性分层流场是可行的.

The waves generated by a moving body beneath the free surface with constant speed in a viscous two-layer fluid of finite depth were studied by solving the Navier-Stokes equation. The volume-of-fluid （VOF） method was used to simulate the characteristics of the surface and interface wakes excited by a moving ball,The effects of the density ratio, the Froude number and the location for the moving ball on the wave patterns and structures of the surface and interface wakes were numerically evaluated. The results indicate that the capability of the computational fluid mechanics approach to the prediction of the viscous stratified flow of a moving submarine is validated.