三维溃坝流的光滑粒子动力学方法模拟

采用光滑粒子动力学SPH(Smoothed Particle Hydrodynamics)方法对三维溃坝流问题进行了数值模拟。为了逼真地模拟出坝内水体与壁面间相互作用而产生的水花飞溅、融合以及近壁面流动等现象,加入了混合长度形式的湍流模型。为了有效地防止粒子穿透固壁,提出了一种新型的适合三维数值模拟的固壁边界处理方法。应用SPH方法对三维溃坝流进行了数值模拟,并分别考虑了未添加障碍物和添加圆柱障碍物两种情形。计算结果表明,改进SPH方法能够精细地捕捉溃坝流在不同时刻的自由液面,并获得稳定而精确的数值结果。

Numerical simulation of 3D dam-break flow using smoothed particle hydrodynamics

We present a numerical simulation of 3D dam-break flow with smoothed particle hydrodynamics (SPH).In order to reproduce the phenomena of splashing and coalescence to the life,the turbulence model,i.e.,the mixing length model is implemented in the SPH code.In order to prevent fluid particles from crossing the walls,we propose an improved treatment technique of wall boundary,which is suitable for 3D numerical simulation.3D dam-break flow is numerically simulated by the improved SPH method.In particular,both cases,i.e.,without any obstacle and with a cylindrical obstacle are considered.It is demonstrated that the improved SPH method can nicely capture the variation of the free surface and well describe the dynamic process of dam-break flow with accurate and stable results.