两栖车辆车轮收起前后阻力对比并行计算分析

Amphibious Vehicle Resistance Comparison in Wheels' Deploying and Retracting Based on Parallel Numerical Computation

为了分析两栖车辆车轮收起前后粘性阻力的变化,利用流体动力学进行仿真分析。在前处理器Gambit中建立两栖车辆的物理模型,结合计算速度和计算精度,对流场采用分区网格划分。利用流体体积函数(VOF)多相流模型、k-ε两方程湍流模型,对车轮收起前后的两栖车辆的粘性绕流场进行了数值模拟。为了提高计算速度,数值模拟采用了并行算法。仿真结果表明:车轮收起后,粘压阻力可减小33%,从而证明收起车轮可减小两栖车辆在水中航行时的阻力。

In order to analyze the change of resistance of an amphibious vehicle in the deploying and retracting of its wheels by using CFD,physical models were established by Gambit,and flows were compartmentalized into mixed grid. Numerical simulations of the amphibious vehicle＇s viscosity ambient flow were carried out by using volume of fluid （ VOF） multiphase model and k-ε turbulent model. The parallel computation is adopted for improving computing speed. Simulation results show that the viscosity resistance can be reduced by 33% when wheels are retracted,its speed is greater when the amphibious vehicle is running in water.