Navigation state of amphibious vehicle has to be determined based on experimental data from the simulation of flow field around high speed amphibious vehicle. In order to realize automatic computation, navigation state of amphibious vehicle was solved based on Arbitrary Lagrangian - Eulerian method that can solve dynamic interaction of vehicle and water. Rigid body motion equations and flow control equations were combined to establish a mathematical model of amphibious vehicles navigating on water. Flow control equations were solved by finite volume method. Dynamic grid was used to achieve dynamic boundary. Weighted recursive estimation method was used to solve the numerical oscillation due to grid update. Flow field around a concept vehicle under the typical conditions was simulated. Results of navigation states and resistance indicate that the method can reflect typical characteristics of vehicles sliding navigation state. The method is suitable for simulation of final flow field around vehicles with high speed navigating on water.%针对高速两栖车辆水上外动态特性分析,需要依赖试验数据确定车辆航态的现状,为实现车辆航态计算自动化的目的,提出采用任意拉格朗日-欧拉法解决车辆与水流的动力耦合,进而获取车辆航态的方法.计算中结合刚体空间运动方程与流场控制方程建立两栖车辆水上运动的数学模型,用有限体积法求解流场控制方程和动网格实现动边界,再用加权递推估计方法解决了数值计算中由于网格更新引起的振荡问题.对比典型工况下概念车型航态和阻力的计算与试验结果,表明这种方法能够反映出车辆滑行航态的典型特征,适合于模拟高速水上航行车辆外流场的最终稳定状态.
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