ABSTRACT

This paper examines the hydroelastic problems of a two-dimensional symmetric flexible wedge water entry through free-fall motion. Water entry is numerically investigated by coupled Finite Volume Method and Finite Element Method using a strong two-way coupling approach. The emphasis of this study is on numerical approach and the paper provides an accurate two-way FSI coupling method for the water entry of two-dimensional symmetric elastic wedge section in different conditions. The effect of freefall velocity is investigated by comparing the constant velocity and freefall impacts. It is shown that the bottom deflection is overestimated by using the constant velocity. In order to evaluate the accuracy of the numerical model, the numerical results are compared and validated against published experimental data and favourable agreement is reported. The vertical position, impact velocity, acceleration, pressure distribution, and deflection along the bottom plate of the elastic wedge are evaluated and compared to experimental data. For better understanding of the hydroelastic slamming, the results are presented for different deadrise angles and vertical velocities. The relation between the structural deflection and vertical velocity, deadrise angle, and pressure distribution is investigated. It is observed that the significance of hydroelasticity increases with decreasing deadrise angle and increasing impact velocity.

摘要

本文研究了通过自由落体运动的二维对称柔性楔入水的水弹性问题。使用强双向耦合方法，通过耦合有限体积法和有限元法对进水进行了数值研究。本研究的重点是数值方法，本文为二维对称弹性楔形截面在不同条件下的入水提供了一种精确的双向 FSI 耦合方法。通过比较恒速和自由落体的影响来研究自由落体速度的影响。结果表明，使用恒定速度高估了底部挠度。为了评估数值模型的准确性，将数值结果与已发表的实验数据进行比较和验证，并报告了良好的一致性。评估垂直位置、冲击速度、加速度、压力分布和弹性楔沿底板的挠度，并与实验数据进行比较。为了更好地理解水弹性砰击，给出了不同死角和垂直速度的结果。研究了结构挠度与垂直速度、死升角和压力分布之间的关系。据观察，水弹性的重要性随着死角的减小和冲击速度的增加而增加。结果显示为不同的死角和垂直速度。研究了结构挠度与垂直速度、死升角和压力分布之间的关系。据观察，水弹性的重要性随着死角的减小和冲击速度的增加而增加。结果显示为不同的死角和垂直速度。研究了结构挠度与垂直速度、死升角和压力分布之间的关系。据观察，水弹性的重要性随着死角的减小和冲击速度的增加而增加。