基于CIP方法的入水过程模拟

Numerical simulation of water entry using CIP model

入水问题涉及到军事、航空等领域,如子弹入水、船舶砰击等,具有很强的应用背景。物体入水的过程涉及到固、液、气三相流动和相互作用,并伴随水花飞溅、空泡形成等复杂的物理现象。该文基于紧致插值CIP(constrained interpolation profile)数学模型,分步求解Navier-Stokes(N-S)方程,并通过多相流理论描述固-液-气之间的相互作用,采用Volume of Fluid(VOF)类型的高精度紧致tangent of hyperbola for interface capturing(THINC)方法重构自由面。模拟了刚性圆柱和方柱的入水过程,结果与实验数据吻合较好。

Water entry problem is of great concern in engineering and military application, the loads imposed on a slamming ship, water entry of bullets, etc. The canonical problem related to interaction of gas, liquid and solid with splash crown and cavity formation, could be very complicated. The constrained interpolation profile （CIP） method is adopted as the base scheme for the flow solver, and tangent of hyperbola for interface capturing （TH1NC） method is used for the free surface treatment. Process of water entry of circular cylinder and square cylinder is simulated and good agreement is obtained comparing with available experimental data.