The interactions between non-spherical particles and fluids are commonplace in both nature and engineering applications, such as deep-sea nodules hydraulic collection. However, accurately simulating granular particles with non-spherical shapes and gaining a deep understanding of the intricate mechanisms involved in fluid–particle interactions still pose significant challenges. In this study, the superquadric model and the Gaussian curvature model are introduced in the Discrete Element Method to describe particle shapes and characterize their nonlinear contact behavior, respectively. Simultaneously, the Fictitious Domain-Immersed Boundary Method (FD-IBM) and the Particle Boundary Field Method (PBFM) are employed to enhance the stability and accuracy of numerical simulations. Building upon these advancements, an extended resolved CFD-DEM-PBFM method is developed. The validation and superiority of this resolved CFD-DEM-PBFM method are rigorously verified by comparing its results with the experimental and other research results across various scenarios, including non-spherical particle collision and packing, particle settling, drafting-kissing-tumbling test, and flow around non-spherical particles. Subsequently, the application of our novel model has been further conducted by a case study that simulates the hydraulic collection of nodules with different aspect ratios . Concurrently, the influences of the nodule shapes on the hydraulic collection mechanism of the hydraulic collection are unveiled in terms of suction forces, trajectory of the particle, and flow field characteristics. Our findings demonstrate that the extended resolved CFD-DEM-PBFM method excels at accurately characterizing multiphase interaction mechanisms at both macro and micro scales, presenting considerable advantages in simulating fluid-particle systems involving non-spherical particles.

中文翻译：

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增强了水力收集过程中非球形颗粒与流体相互作用的完全解析 CFD-DEM-PBFM 模拟

非球形颗粒和流体之间的相互作用在自然和工程应用中都很常见，例如深海结核水力收集。然而，准确模拟非球形颗粒并深入了解流体-颗粒相互作用的复杂机制仍然面临重大挑战。本研究在离散元法中引入超二次模型和高斯曲率模型分别描述颗粒形状和表征其非线性接触行为。同时，采用虚拟域浸入边界法（FD-IBM）和粒子边界场法（PBFM）来提高数值模拟的稳定性和准确性。基于这些进步，开发了一种扩展解析的 CFD-DEM-PBFM 方法。通过将其结果与各种场景下的实验和其他研究结果进行比较，包括非球形颗粒碰撞和堆积、颗粒沉降、牵伸-接吻-翻滚测试、并在非球形颗粒周围流动。随后，通过模拟不同纵横比结核的水力聚集的案例研究进一步应用了我们的新模型。同时，从吸力、颗粒轨迹和流场特性方面揭示了结核形状对水力收集机制的影响。我们的研究结果表明，扩展解析的 CFD-DEM-PBFM 方法擅长在宏观和微观尺度上准确表征多相相互作用机制，在模拟涉及非球形颗粒的流体颗粒系统方面具有相当大的优势。