To simulate the viscous flow around a hydrofoil advancing in the vicinity of free surface, the Reynolds averaged Navier-Stokes (RANS) equation is solved numerically using finite volume method. The semi-implicit linked equations consistent (SIMPLEC) algorithm is employed for pressure-velocity coupling. When using volume of fluid (VOF) method to capture the interface, the air and liquid are taken as one type of fluid with different density. At first, the numerical scheme developed in this study was validated through the comparison between the present results and the experimental data. Then, extensive simulation was performed on the wave excitation, pressure distribution and hydrodynamic force of the hydrofoil. Some interesting phenomena, such as the wave rolling, were also discussed. It can be seen from the numerical results that the closer the distance between the surface and the hydrofoil, the smaller the lift and drag of hydrofoil, and the free surface effect can be neglected if the distance is larger than four times of the chord length of the hydrofoil.%为了研究近自由面下水翼附近的黏性流动,通过有限体积法对雷诺时均N-S方程进行数值求解,速度压力耦合方式采用SIMPLEC解法,用流体体积函数模型来捕捉自由液面.首先将数值计算结果与实验值进行对比以验证所用数值方法的可行性,随后进一步研究了水翼的兴波、表面压力分布以及其水动力性能,并针对翻卷波现象进行了分析.从计算结果可以看出,距离自由面越近,水翼的升力和阻力越小.当水翼距离自由液面4倍弦长距离后,自由液面的影响基本可以忽略.
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