关键词: 不可压缩Navier-Stokes方程, 浸入边界法, 流体?结构相互作用, 二次碰撞, 船撞桥

Abstract: A 2D process of a plane-movement object (boat) moving around a static one (bridge pier) is investigated by combining incompressible Navier-Stokes equations with immersed boundary methods. The fluid’s effects on the boat and the boat’s track are mainly studied. The results show that the drag and lift curve lines oscillate with finite amplitudes at the beginning and approach to periodic micro vibrations soon. The boat rotates clockwisely at first, and then the speed becomes smaller and smaller, and later it changes to an anticlockwise rotation. Finally the boat’s stern moves away from the pier, and it won’t impact with the pier. The boat’s trajectory agrees with that from the real boat experiments.

Key words: incompressible Navier-Stokes equations, immersed boundary method, fluid-structure interaction, secondary impact, ship-bridge pier collision