Understanding fluid–structure interaction (FSI) is important because it dominates diverse natural phenomena and engineering problems. This paper presents an integrated particle model for FSI problems involving irregular channel flows and crack propagation in structures. The proposed model is implemented as follows: (1) we couple weakly compressible smoothed particle hydrodynamics (WCSPH) with bond-based peridynamics (BBPD) in a partitioned approach (this framework has a much simpler algorithm than the previously reported SPH-PD method); (2) we propose a novel periodic boundary conditions (PBCs) algorithm for modeling flows in non-regular channels; and (3) we incorporate crack propagation in structural responses under fluid dynamics, which was rarely considered in previous works. The new framework has been validated and illustrated to be effective and versatile in diverse FSI problems, including hydrostatic pressure-induced solid deformation, violent free-surface flows and channel flows interacting with flexible structures. Compared with conventional grid-based methods, this particle framework is more user-friendly, since no extra effort is required to update meshes, even when a discontinuity appears during the modeling process. The extendibility and potential of this framework is further demonstrated by the simulation of fluid-driven deformation and crack propagation in elastomers.

了解流固耦合 (FSI) 很重要，因为它支配着各种自然现象和工程问题。本文提出了一个集成粒子模型，用于解决涉及不规则通道流动和结构中裂纹扩展的 FSI 问题。所提出的模型实现如下：（1）我们将弱可压缩平滑粒子流体动力学（WCSPH）与基于键的近场动力学相结合（BBPD）在分区方法中（该框架的算法比之前报道的 SPH-PD 方法简单得多）；(2) 我们提出了一种新颖的周期性边界条件 (PBCs) 算法，用于对非常规通道中的流进行建模；(3) 我们将裂纹扩展纳入流体动力学下的结构响应中，这在以前的工作中很少考虑。新框架已经过验证并被证明在各种 FSI 问题中是有效和通用的，包括静水压力引起的固体变形、剧烈的自由表面流动和与柔性结构相互作用的通道流动。与传统的基于网格的方法相比，这种粒子框架更加用户友好，因为即使在建模过程中出现不连续性，也不需要额外的工作来更新网格。