In this paper, the isogeometric formulations of the finite element and boundary element methods are applied to the dynamic analysis of thin-walled structures submerged in an infinite, inviscid, and incompressible fluid medium. This fluid–structure interaction problem is decoupled using the modal analysis technique, and the fluid effect on the structure is taken into account through the generalized added mass matrix. The structure is modeled with NURBS-based Kirchhoff–Love shell elements. The fluid response is computed using a regularized boundary integral equation. We take advantage of the geometry preserving property of the NURBS refinement techniques to reduce the computational cost without the need for a projection scheme. The implementation is benchmarked with three test cases, and good accuracy is obtained for a relatively low number of degrees of freedom.

在本文中，有限元和边界元方法的等几何公式被应用于淹没在无限、无粘性和不可压缩流体介质中的薄壁结构的动力分析。该流固耦合问题使用模态分析技术解耦，并通过广义相加质量矩阵考虑了流体对结构的影响。该结构使用基于 NURBS 的 Kirchhoff-Love 壳单元建模。使用正则化边界积分方程计算流体响应。我们利用 NURBS 细化技术的几何保留特性来降低计算成本，而无需投影方案。该实现以三个测试用例为基准，