湍流模型对470级帆船船体水动力性能的影响研究

Research on the Hull Hydrodynamics with the Different Turbulence Models for 470 Class Yacht

470级帆船是奥运会比赛项目,其船体水动力性能对运动员成绩具有重要影响,为了得到适合470级帆船船体水动力数值计算的湍流模型,利用计算流体动力学(computational fluid dynamics,CFD)方法,通过求解雷诺平均纳维尔-斯托克斯方程(Reynolds-averaged Navier-Stokes Equations,RANSE)对470级帆船船体在不同湍流模型下的周围黏性绕流场进行了数值模拟研究。计算网格采用结构化网格,自由液面采用VOF(volume of fluid,VOF)的方法进行处理。讨论SST k-ω模型、Standard k-ω模型、Standard k-ω模型、Realizable k-ω模型、RNG k-ω模型5种湍流模型对帆船水动力性能数值模拟计算结果的影响与原因,根据计算结果与经验公式估算结果比较分析,确定了470级帆船船体数值模拟采用RNG k-ω模型与经验公式更为接近。研究结果为下一步数值模拟帆船船体水动力性能打下了基础。

470 class yacht is an important Olympic event and the hydrodynamic performance of the hull has an important influence on athlete＇ s performance. In order to abstain the influence of different turbulence models on the hull hydrodynamic performance for 470 class yacht, Reynolds - averaged Navier - Stokes Equations based on the CFD method were solved to simulate the viscous flow field around the hull. Structured grid is used in computing grid and the free surface was adopted by use of VOF （ volume of fluid, VOF） method. The SST turbulence model, Standard turbulence model, Standard turbulence model, the Realizable turbulence model and RNG turbulence model were discussed for the hull hydrodynamics. A comparison of the numerical simulation and the empirical formula indicates that the RNG turbulence model is more closely to the empirical formula and can simulate the viscous flow field around the hull. This result will load the foundation for the numerical simulation of the hull hydrodynamic for 470 class yacht.