带自由液面的艇/桨干扰特性数值模拟与验证研究

带自由液面的艇/桨干扰特性研究是水动力学领域的重点与难点.此文采用数值模拟方法研究了潜艇近水面航行时的艇/桨干扰特性.首先介绍了计算方法:流场采用RANS方法结合RNGk -ε湍流模型求解；自由液面捕捉采用VOF方法；螺旋桨运转采用滑移网格方法；带螺旋桨潜艇表面与计算域内全部采用结构化网格进行离散.然后,对于SUBOFF潜艇模型在不同浸深下的阻力特性进行了数值模拟,分析了自由液面对于模型阻力的定量影响.最后,对于带螺旋桨的SUBOFF潜艇模型在深潜与近水面状态下的艇后推力、扭矩进行了数值模拟,分析了自航因子,研究了艇/桨干扰特性.计算结果与试验结果进行了详细的对比分析,验证了计算方法与计算结果的可靠性.本文的工作可为将来构建数值拖曳水池提供技术支撑.

Numerical simulation of hull/propeller interaction with free surface

Hull/propeller interaction with free surface is important for powering performance prediction in ship hydrodynamics.The numerical simulation of hull/propeller interaction of submarine in near surface condition is presented in the paper.The flow field is numerically simulated by solving RANS equations with RNG turbulence model.Free surface is captured by Volume of Fluid(VOF) method.The effect of propeller is simulated by sliding mesh technique.The resistance and wave pattern of a submarine model at different depths of submergence are computed,and the effect of free surface on resistance is investigated.The thrust and torque of self-propulsion submarine in deep submergence and near surface conditions are computed to analyze the self-propulsion factors and hull/propeller interaction.The comparison between the prediction and the model test measurement shows fairly good agreement.The results in the paper will support numerical towing tank establishment in future.