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Numerical simulations for water entry of hydrophobic objects

机译：疏水物体入水的数值模拟

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摘要

Based on the boundary data immersion method (BDIM) and the volume of fluid (VOF) method, the water entry process of hydrophobic objects is numerically simulated. The water crown, the cavity and the flow pattern are analyzed. In the present study, the cavity shape caused by the water entry and trajectories of objects are simulated by the numerical method. Simulation results are compared with experimental data, and the comparisons show that the present numerical approach has the ability to predict the complex process of water entry as well as the effects of the density of an object and entry velocity. Numerical results indicate that the depth of pinch-off increases as reducing the characteristic length of the cavity; the pinch-off time increases for the sphere with a larger density; the depth of cylinder, where occurs the cavity shape inversion behavior, is not affected by the entry velocity of the cylinder.
机译：基于边界数据浸入法（BDIM）和流体体积（VOF）法，对疏水性物体的入水过程进行了数值模拟。分析了水冠，型腔和流型。在本研究中，通过数值方法模拟了由水的进入和物体的轨迹引起的空腔形状。仿真结果与实验数据进行了比较，比较结果表明，该数值方法能够预测复杂的入水过程以及物体密度和进入速度的影响。数值结果表明，夹断深度随着腔体特征长度的减小而增加；密度较大的球体的夹断时间增加；圆柱的深度（发生腔体形状反转行为）不受圆柱进入速度的影响。

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