中文摘要：

两栖车形体复杂，其水上绕流场和水上性能难于用传统手段进行预报，计算流体力学为解决这一问题开辟了新途径。以计算流体力学中广泛使用的雷诺时均纳维～斯托克斯方程为基本控制方程，采用切应力输运型k-w湍流模型结合流体体积分数法，进行两栖车水上两相绕流场的数值模拟。控制方程由有限体积法离散，压力速度耦合采用SIMPLE策略处理，代数方程由高斯-赛德尔法求解。阻力是快速性的主要指标，以其为判据对比试验与模拟得到的阻力结果，相对误差在5％左右。构建阻力-速度模型，模型的系统参数由最小二乘法进行辨识后得到结论，兴波阻力与航速的1．88次方成正比，摩擦阻力与航速的1．76次方成正比，粘压阻力与航速的3．54次方成正比。得到的系统模型为定性分析两栖车水上快速性提供了依据。

英文摘要：

Amphibious vehicle is too complicated to predict flow field around it. Computational fluid dynamics provide a new path for solving the problem. Flow field around vehicle is simulated based on Reynold averaged Navier-Stokes equations associated with Shear Stress k-w turbulence model and Volume of Fluid scheme. Governing equations are discretized by finite volume method, SIMPLE method is used for pressure correction, G-S is used for solving algebra equations. As a primary index for power performance, simulated value of resistance is compared to the value from experiment, relative error is about 5%. Resistance vs. velocity model is built and parameters in it are identified by least square method. Conclusion, wave resistance is proportional to 1.88th power of velocity, friction resistance is proportional to 1.76th power of velocity, shape resistance is proportional to 3.54th power of velocity. Hydro-power performance of amphibious vehicle can be qualitatively analyzed by means of this model.