【摘要】 以不可压缩流体的N-S方程为基本控制方程,用快速粒子level set方法(FPLS)追踪自由表面,提出了一种新的三维水流数值模型。在自由表面处应用虚拟压力法来封闭压力泊松方程,同时用速度等值外插的方法构造自由表面外侧的虚拟速度分布。通过模拟水波振荡、水柱崩塌、水滴滴落和空箱注水过程证明了模型的有效性。更多还原

【Abstract】 A new numerical model for three-dimensional flow is proposed,in which the Navier-Stokes(N-S) equations of incompressible fluid are solved as the governing equations for flow movement,and a fast particle level set method is adopted for free surface tracking.The N-S equations are solved only in the liquid phase for saving computational time.A ghost pressure method is utilized to close the Poisson equation on the free surface and the simple extrapolation of velocity is applied to obtaining the ghost velocity field out of the water domain.The flow model is verified by the modeled results of oscillatory flow,collapse of water column,impact of water drop and water infusion.更多还原