基于OpenFOAM的大型三体船连接桥入水砰击载荷数值模拟分析

Numerical investigation on water-entry slamming load of large trimaran cconnecting bridge using OpenFOAM

  • 摘要:
      目的  旨在探究三体船连接桥落体砰击载荷分布规律。
      方法  基于OpenFOAM开源软件以及连续性方程和N-S方程,建立三体船连接桥自由落体入水砰击数值模型,模拟三体船连接桥自由落体入水砰击过程中的速度、砰击压力以及自由液面动态变化,开展网格收敛性分析,验证数值计算方法的正确性,并将数值解与实验值进行对比。
      结果  结果显示,所提模型能够有效预报三体船连接桥结构的落体砰击载荷,靠近外折角点的连接桥砰击压力系数最大,得到了连接桥下表面砰击压力峰值及砰击压力系数与速度的关系。
      结论  研究给出的三体船连接桥入水砰击压力特性和范围可为三体船结构强度评估与结构设计提供数值基础。

     

    Abstract:
      Objective  The purpose of this paper is to explores the slamming load distribution of a trimaran connecting bridge.
      Methods  Based on OpenFOAM open source software and starting with the continuity equation and N-S equation, this paper establishes a free entry slamming numerical model of a trimaran connecting bridge. The dynamic changes of velocity, slamming pressure and free surface during the free entry slamming process of the trimaran connecting bridge are simulated. The convergence analysis of the grid is carried out, and the numerical solution is compared with the experimental solution to verify the accuracy of the numerical calculation method.
      Results  The results show that this method can effectively predict the falling body slamming load of a trimaran connecting bridge structure. It is found that the slamming pressure coefficient of the connecting bridge is largest near the outer corner. The peak value of the slamming pressure on the lower surface of the connecting bridge and the relationship between the slamming pressure coefficient and velocity are then obtained.
      Conclusions  This study presents the characteristics and range of slamming pressure on a trimaran connecting bridge, providing a numerical basis for the structural strength evaluation and design of trimarans.

     

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