高速滑行艇阻力性能RANS计算中网格影响因素

Influencing mesh factors in the calculation of the resistance performance of high-speed planing crafts through RANS

为了准确预报高速滑行艇的水动力与阻力特性,本文基于RANS方法和重叠网格技术针对某50kn高速单体滑行艇的缩比船模阻力特性开展了数值计算研究。分析了网格类型、船体边界层网格分布、船体表面网格尺度、流场背景域网格加密等网格相关因素对艇底气水混合物分布、兴波形状、船体姿态以及船体阻力预报结果的影响,并与船模阻力试验结果进行了比较。通过研究认为:开展高速滑行艇的运动与阻力性能RANS预报时,网格因素对模拟高速滑行艇边界层流动、艇体周围湍流流动和兴波特性,以及预报艇底气水分布、艇体航行姿态与阻力性能具有显著影响。

The hydrodynamics and resistance characteristics of a 50 kn high-speed monomer planing craft were numerically studied and predicted by applying the RANS method and the overset mesh. Different mesh factors,such as mesh type,mesh arrangement inside the hull boundary layer,mesh size of the hull surface,and mesh refinement in the background domain of flow field,were analyzed and used to predict the influence of air-water distribution on the hull bottom,wave shape,hull attitude,and resistance. The resistance values calculated through numerical methods were compared with model test results. Mesh factor had a significant influence on the boundary layer flow and turbulent flow around the hull;wave characteristics;and the prediction of air-water distribution,ship attitude,and resistance performance when predicting the motion and resistance performance of high-speed planing craft through the RANS method.