Abstract: Based on a general-purpose fluid dynamical simulation software CFX,a numerical method is brought up to calculate viscous hydrodynamics of Unmanned Underwater Vehicles(UUVs).In this method,a standard κ-ε turbulence model is adopted to compute positional hydrodynamic coefficients,and a standard κ-ω turbulence model is used to compute rotational and other coupling coefficients.Computational results of "CR-02" 6000 m Autonomous Underwater Vehicle(AUV) show that hydrodynamic coefficients obtained with this method is of high presicion.This method can satisfy the requirements of maneuverability design,motion prediction and simulation during UUV's scheme design period.