考虑表面退化的侵蚀磨损数值研究：基于CFD-DEM与键合模型的耦合方法
Numerical investigation of erosive wear considering surface degradation using coupled CFD-DEM and a bond model
AI总结：
本研究提出一种耦合CFD-DEM与键合模型的三维模拟方法，通过离散化固体并引入键合网络，在考虑表面变形与退化累积的同时，实现流体、结构与颗粒三方相互作用的侵蚀磨损预测，并在层流和湍流中验证了与传统CFD的一致性。
摘要：
本文提出了一种三维仿真模型，用于研究固体颗粒对结构造成的侵蚀磨损，该模型考虑了侵蚀过程中表面变形与退化的累积效应。尽管已有大量关于侵蚀的研究，但这些研究主要基于半经验方程来预测材料损失，缺乏一种工程方法来考虑侵蚀过程中表面演化的重要性，而表面演化已被证明至关重要。我们提出的模型旨在克服这些挑战。在该方法中，将常规的固体体积离散为若干离散球形单元。在微观尺度上，通过添加键合网络连接相邻颗粒，从而在宏观尺度上形成内聚结构。这实际上是计算流体力学（CFD）-离散元法（DEM）耦合的颗粒流模拟与使用键合模型的DEM材料建模的结合。当传统的连续刚性物体被由键合球形颗粒组成的相应离散可变形物体替代时，我们对层流和湍流中的流体响应进行了广泛研究。离散物体的替代使得该模型能够自然地纳入流体、结构和颗粒的三方相互作用。宏观尺度上流体与结构之间的相互作用，通过微观尺度上流体与键合颗粒之间的相互作用隐式表示，而固体材料的性质及其微观结构则通过键合的性质来再现，这些键合性质考虑了变形与断裂。解析和非解析耦合方案均与传统CFD方法取得了良好的一致性。
英文摘要：
A three-dimensional simulation model is proposed here to study the erosive wear of structure caused by solid particles, which accounts for the accumulation of surface deformation and degradation during the erosion process. Although there are numerous studies on the erosion, they have been primarily based on semi-empirical equations to predict the material loss and lack of an engineering approach to account for the surface evolution during erosion process, which is proved to be of great important. Our proposed model aims to overcome these challenges. In this approach, a conventional volume of solid object is discretized into a number of discrete spherical elements. A bond network is added to connect neighbouring particles at micro-scale, forming a cohesive structure at macro-scale. It is indeed a combination of particulate flow simulation by coupled Computational Fluid Dynamics (CFD) - Discrete Element Method (DEM) and materials modelling by DEM using a bond model. An extensive study of fluid response in both laminar and turbulent flow is conducted when the traditional continuous rigid object is replaced by a corresponding discrete deformable object composed of bonded spherical particles. The replacement of discrete object allows this model to naturally incorporate the three-way interaction of fluid, structure, and particles. The interaction between fluid and structure at macro-scale is implicitly represented by the interaction between fluid and bonded particles at micro-scale, while material properties and the micro-structure of the solid object are reproduced by properties of bond that account for deformation and fracture. Both resolved and unresolved coupling schemes result in good agreement with the traditional CFD approach.
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