The fluid-structure interaction phenomenon is often encountered in the ocean engineering field. In the present work, a non-local numerical model is developed for the simulations of weakly compressible viscous fluid and elastic structure interactions. The peridynamic theory is adopted for both the structure and fluid modelling. The elastic structure is described by using the ordinary state-based peridynamics, while the fluid is modelled by utilizing the peridynamic differential operator. Furthermore, the updated Lagrangian description is adopted for the fluid including the relative deformation gradient expressed by the peridynamic differential operator. The fluid-structure interface and its normal direction are calculated via the gradient of a colour function, which varies with the fluid motion and structure deformation. Besides, the interaction force exerted from fluid to structure is constrained to be always perpendicular to the moving interface. Hence the fluid motion and structural deformation are predicted simultaneously. The validation of the developed model is conducted through the simulation of a water dam break with a rubber gate. The good agreement between the peridynamic and the experiment results demonstrates the capability of the current model for solving fluid-elastic structure interaction problems.

在海洋工程领域中经常遇到流固耦合现象。在目前的工作中，开发了一个非局部数值模型来模拟弱可压缩粘性流体和弹性结构的相互作用。结构和流体建模都采用了围动力学理论。弹性结构是通过使用基于状态的普通状态动力学描述的，而流体是通过使用周动力学微分算子建模的。此外，对于包括由周边动力学微分算子表示的相对变形梯度的流体，采用更新的拉格朗日描述。流体-结构界面及其法线方向是通过颜色函数的梯度来计算的，该函数随流体运动和结构变形而变化。除了，从流体施加到结构的相互作用力被约束为始终垂直于运动界面。因此，可以同时预测流体运动和结构变形。通过模拟带有橡胶闸门的水坝溃决来验证开发模型的有效性。周围动力学和实验结果之间的良好一致性证明了当前模型解决流体-弹性结构相互作用问题的能力。