底部呈二维缓变情况下超大型浮体水弹性响应的两种计算方法比较

Comparison of two numerical methods for prediction of hydroelastic responses of VLFS on 2D mild variable bottom

超大型浮体在海洋资源开发和海洋空间利用方面有重要应用前景。非均匀海洋环境中的水弹性响应是其应用中的一个重要问题。在近海中最典型的非均匀海洋环境当属由于底部变化引起的非均匀现象。本文分别采用多重尺度法(零阶近似)和常规的有限水深势流格林函数边界积分法,对底部呈二维缓变情况下超大型浮体的水弹性响应问题进行了研究和对比,并与实验工况进行了对照。两种方法与试验结果吻合较好,证明非均匀海洋环境确实对超大型浮体的水弹性响应具有一定的影响。

In the exploration of ocean resources and utilization of ocean space, very large floating structures are of significant use. Hydroelastic response analyses of VLFS under inhomogeneous sea environment is an important problem. The most typical inhomogeneous ocean environment in offshore is the inhomogeneity caused by the uneven bottom. The hydroelastic response of VLFS on a 2D mild variable bottom is studied by using multiple scale expansion method （ zero-order approximation） and boundary integral method based on Green function of finite water depth respectively. The cases tested in the lab are also compared. The comparisons between the test and the calculation results are in good agreement. It is found that the inhomogeneous ocean environment has some effects on the hvdroelastic response of VLFS.