摘要： 光滑粒子动力学方法是一种常用的多相流仿真方法,但由于在自由表面光滑半径内的粒子数目偏少,其存在拉伸不稳定性。此外,浮力耗散也会使低密度粒子聚集成堆并位于高密度粒子内部。针对这2个问题,提出一种改进的多相流仿真方法。通过核常量修正法消除拉伸不稳 定性,通过给低密度粒子添加额外人工浮力的方法解决浮力耗散问题。实验结果表明,该方法能快速、准确地对多相流现象进行实时仿真。

关键词: 流体仿真, 多相流, 光滑粒子动力学, 拉伸不稳定性, 人工浮力

Abstract: Smoothed Particle Hydrodynamics(SPH) is a common method for multiphase flow simulation.In standard SPH based methods,less particles are inside the support radius near the surface,which usually leads to tensile instability.On the other hand,due to buoyancy dissipation,it will cause a problem during this simulation period:lower density particles will gather together and locate inside the higher density particles.Facing these two problems,this paper proposes an improved multiphase flow simulation method.It uses a constant kernel correction to eliminate tensile instability.Meanwhile,it adds an extra artificial buoyancy to those low density particles to overcome buoyancy dissipation.Experimental result shows that the proposed method can simulate multiphase flow quickly realistically in real time.

Key words: fluid simulation, multiphase flow, Smoothed Particle Hydrodynamics(SPH), tensile instability, artical buoyancy

中图分类号: 

• TP391