基于ALE算法的无转角和有转角铝制加筋板楔形体水弹性砰击的数值模拟研究

Numerical investigation of hydroelastic impact on one free-drop wedge with aluminum stiffened panels considering roll angles using ALE algorithm

文章采用基于任意拉格朗日—欧拉(ALE)算法的显式有限元技术研究水弹性砰击现象,针对已开展的铝制加筋板楔形体结构入水砰击模型实验,开展了数值模拟比较工作。该楔形体底部斜升角为20度,底部两侧是包含三根纵骨和两根横梁的加筋板结构,两侧结构刚度不同。预报了模型无转角和有转角典型工况的砰击入水过程,得到的入水加速度、底部加筋板结构纵骨应力和横梁响应与模型实验结果吻合较好。研究表明该ALE算法具备模拟船舶局部结构的水弹性砰击流固耦合问题的能力。

The explicit finite element method using the Arbitrary Lagrangian-Eulerian （ALE） algorithm is applied to investigate the hydroelastic impact of one free-drop wedge with aluminum stiffened panels. The dead-rise angle is 20 degrees. The stiffened panel on each side of the wedge is made up of 3 longitudinal stiffeners and 2 transverse frames with different sizes of cross sections. The acceleration motion, stress re-sponses on longitudinal stiffeners and transverse webs of the stiffened panels are obtained. The numerical results are validated with the new experimental results from drop tests with and without roll angles. This so-lution shows the capability of ALE algorithms and its potential to predict the hydroelastic slamming of lo-cal structures on ships.