浅水中船舶水动力特性数值计算

本文对浅水中船舶水动力特性进行数值计算研究.采用RANS方程结合RNG K-ε两方程湍流模型,对一方形系数0.6的系列60船模在浅水中的阻力、升沉、纵倾和兴波进行数值计算,其中自由面采用VOF方法处理;计算中,水深Froude数范围0.6～1.8,包含了临界和超临界水深Froude数.数值计算得到的阻力、升沉和纵倾与模型试验结果及采用三维扩展Boussinesq方程的计算结果进行了比较分析,吻合较好,部分计算结果得到改进.

CFD Calculation for Resistance of a Ship Moving near the Critical Speed in Shallow Water

The present study focuses on numerical calculation for a ship moving at a near-critical speed in shallow water by solving Reynolds Averaged Navier-Stokes equations (RANSE). Volume of Fluid (VOF) was applied for simulation of free surface flow around a 3D shaped ship in shallow water. A Series 60 ship with block coefficient Cb=0.6 was used in computation to predict resistance, wave pattern,sinkage and trim.Viscous effects are considered and no-slip boundary condition is imposed on the body surface, walls and bottom. Using CFD to ship hydrodynamics in shallow water, not only wave resistance but also friction resistance and the total resistance are predicted.The calculated values were compared with testing data,and good agreement was achieved between the numerical results and experimental results.