舰船遭遇水下爆炸毁伤前期经常会产生大破口和刚体速度，在后期舱室急速进水过程中流场会捕获空气形成空泡流和高压气垫，造成不稳定的空气动力，引起船体产生喘息式大幅运动，对舰船的生命力造成严重的威胁。国际海事组织和ITTC会议已多次将空气效应作为破损船研究的关键词。为此，本项目将爆炸毁伤破口和刚体速度作为输入条件，基于可压缩流体动力学和流固耦合理论，首先建立舰船破舱进水的气-液-固全时域耦合无网格数值模型，并通过模型实验验证其正确性；然后，计及爆炸诱导刚体速度和舱室气密度的影响，研究破舱进水过程空泡的流动特性，揭示高压气垫形成及其与船体作用规律；进而研究在浪流作用下破舱内空气的不稳定流动及其引起的船体喘息式运动机理。研究内容包括：1）破舱急速进水的气-液-固全时域耦合模型；2）破舱动态进水空气捕获及气垫效应；3）复杂海况下破舱内部空气流动及船体喘息式运动规律；4）破舱急速进水空气效应模型实验研究。

At the early stage of a warship subjected to explosive damage, a large breaking and a rigid-body velocity are caused. After that, the water flooding to the cabin will capture the air and thus the air cavity and high-pressure air cushion are formed. In this period, the unstable air flows will be caused and thus results in the breathing-like motion of the ship hull, which poses serious threats to the survivability of the warship. The International Maritime Organization (IMO) and the ITTC conference have repeatedly specified the key word of air effects for the study of damaged ship dynamics. In this study, the breaking and the rigid-body velocity caused by explosion are included as initial conditions. Based on the compressible fluid dynamics and the theory of multiphase interactions, combined with the multi-scale model experiments, firstly the numerical model in full time domain for the air-liquid-body interactions during the warship flooding is established with the meshless method, then taking into account the influences of the explosion-induced rigid-body velocity and the airtightness of the damaged cabin, the flow characteristics of the air cavity during flooding are studied to reveal the formation mechanism of the high-pressure air cushion and its interactions with the ship hull. Furthermore, under the actions of waves and currents, the laws of the unstable air flows and its induced breathing-like motion of the hull are studied. The research contents are as follows: 1) the numerical model of multiphase interactions in full time domain for the damaged cabin flooding; 2) the air capture and air cushion formation during the dynamic flooding; 3) the air effects and its induced breathing-like motion under complicate sea conditions; 4) the model experiments of the air effects during the rapid flooding.