The study of fluid–structure interaction (FSI) is a challengeable topic, which concerns a coupled system with consideration of not only the behaviors of the fluid and the structure, but also the interaction process between both. In this paper a coupled method is introduced to simulate FSI problems in two-dimensional (2-D) case. In this coupled method (2-D DDA-SPH), the smoothed particle hydrodynamics (SPH) based on kernel approximation and particle approximation is employed to represent the fluid domain governed by Navier–Stokes equations and the discontinuous deformation analysis (DDA) based on the minimum total potential energy principle is used to model the real solid structure (with rigidity or elasticity) through virtual joints. A coupling scheme bridging both methods is used based on a penalty-force method, and an improved contact detection between particle and block is proposed. Several challenging examples, including breaking dam flow through an elastic plate, breaking dam flow on a rigid barrier or an elastic barrier are investigated to demonstrate the capability of the 2-D DDA-SPH method to capture the entire FSI process. Finally, two application examples, failure of gravity dam induced by water pressure, and dynamic response of armor blocks on breakwater under incident wave, are studied by using 2-D DDA-SPH. The simulation results show satisfactory agreements with available experimental, numerical, and analytical results, suggesting the applicability of the 2-D DDA-SPH method to solve FSI problems.

流体-结构相互作用（FSI）的研究是一个具有挑战性的话题，它涉及一个耦合系统，不仅要考虑流体和结构的行为，还要考虑两者之间的相互作用过程。本文介绍了一种耦合方法来模拟二维（2-D）情况下的FSI问题。在这种耦合方法（2-D DDA-SPH）中，基于核逼近和粒子逼近的平滑粒子流体动力学（SPH）用于表示由Navier–Stokes方程控制的流体域，以及基于非均匀变形分析（DDA）的流体域。最小总势能原理用于通过虚拟接头对真实的实体结构（具有刚度或弹性）建模。结合两种方法的耦合方案是基于惩罚力法的，提出了一种改进的粒子与块之间接触检测方法。研究了几个具有挑战性的示例，包括通过弹性板破坏坝流，在刚性屏障或弹性屏障上破坏坝流，以证明2-DDAA-SPH方法捕获整个FSI过程的能力。最后，利用二维DDA-SPH研究了两个应用实例，即水压引起的重力坝破坏和入射波作用下防波堤上装甲块的动力响应。仿真结果表明，与可用的实验，数值和分析结果均令人满意，表明二维DDA-SPH方法可解决FSI问题。研究了在刚性屏障或弹性屏障上破坏水坝的流量，以证明二维DDA-SPH方法捕获整个FSI过程的能力。最后，利用二维DDA-SPH研究了两个应用实例，即水压引起的重力坝破坏和入射波作用下防波堤上装甲块的动力响应。仿真结果表明，与可用的实验，数值和分析结果均令人满意，表明二维DDA-SPH方法可解决FSI问题。研究了在刚性屏障或弹性屏障上破坏水坝的流量，以证明二维DDA-SPH方法捕获整个FSI过程的能力。最后，利用二维DDA-SPH研究了两个应用实例，即水压引起的重力坝破坏和入射波作用下防波堤上装甲块的动力响应。仿真结果表明，与可用的实验，数值和分析结果均令人满意，表明二维DDA-SPH方法可解决FSI问题。通过使用2-D DDA-SPH进行研究。仿真结果表明，与可用的实验，数值和分析结果均令人满意，表明二维DDA-SPH方法可解决FSI问题。通过使用2-D DDA-SPH进行研究。仿真结果表明，与可用的实验，数值和分析结果均令人满意，表明二维DDA-SPH方法可解决FSI问题。