The water entry process associated with complicated unsteady structures, with consideration of the influence of the waves, is not well studied. In the present work, the oblique water entry of a cylinder under different regular waves is numerically investigated. The volume of fluid (VOF) method and the sub-grid scale (SGS) stress model based on the large eddy simulation (LES) method are adopted for the 3-D simulation with six degrees of freedom. The present numerical model is based on a wave model, and as shown by the previous work that the predicted cavity evolution in the calm water agrees well with the experimental results. The present model is validated and it is shown that it could be used to predict the correct wave periods and fluctuations. The cavity evolution mechanism, the dynamic characteristics and the vortex structures are analyzed. The cavity of the water entry with waves closes more quickly than in the calm water case. Finally, several parametric studies of the water entry with different wave heights and water entry locations are carried out. The results provide insights into the effects of the waves on the cavity dynamics for oblique water entry problems.

考虑到波浪的影响，与复杂的不稳定结构相关的入水过程还没有得到很好的研究。在目前的工作中，数值研究了在不同规则波作用下圆柱体的倾斜水进入。六自由度的3-D仿真采用流体体积（VOF）方法和基于大涡模拟（LES）方法的子网格比例（SGS）应力模型。当前的数值模型基于波浪模型，并且如先前的工作所示，在平静水中预测的空腔演化与实验结果非常吻合。该模型得到了验证，并表明可以用于预测正确的波浪周期和波动。分析了腔的演化机理，动力学特性和涡旋结构。与平静水箱相比，带有波浪的进水腔关闭得更快。最后，对具有不同波高和进水位置的进水进行了一些参数研究。结果为斜波进入问题中的波浪对腔动力​​学的影响提供了见解。