数值模拟现代水面舰船带自由面的湍流绕流场

为了研究带自由面的船舶湍流绕流场,选择了一艘ITTC推荐的公开船模作为模拟对象,数值求解RANS方程。此模型为带声呐导流罩和方形尾封板的复杂水面舰船。采用Ogrid块拓扑算法生成质量较高的纯六面体多块结构化网格,计算中采用RNG k-ε湍流模式和标准壁面函数,并使用VOF算法来捕捉自由面。空间离散采用QUICK格式,压力-速度解耦采用PISO算法。将阻力和波形的数值结果与实验数据相比较,总阻力系数误差约2%,船侧波形、船首自由面吻合良好,显示了CFD方法在船舶水动力学中预测带自由面湍流绕流场的有效性。

Numerical Simulation of Modern Surface Ship in Free Surface Turbulent Flow

A public ITTC recommended complex modern surface ship model with sonar dome and transom stern was chosen for numerical simulation of free surface turbulent flow.Pure hexahedral multi-block structured grids with fine quality were generated by using Ogrid topology.Transient RANSE were numerically calculated and the RNG k-ε turbulence model with standard wall functions was employed.The VOF algorithm was applied to track free surface.QUICK scheme was used for spatial discretization and PISO scheme for pressure-velocity coupling.Computational results including resistance coefficients and wave profile were compared to experimental data with good agreement.The total resistance coefficient has a bias of two percentage,wave profile and bow free surface accord the data with a good precision,showing that CFD method can effectively predict the free surface turbulent flow in ship hydrodynamics.