海南大学Liu Xing团队报道了大型复杂颗粒流体-颗粒相互作用的耦合模拟：一种用于模拟不规则烧结颗粒垂直固定床中气流的解析CFD-DEM方法。相关研究成果于2024年1月12日发表在《颗粒学报》。

研究人员提出了一种解析的CFD-DEM方法来模拟大型复杂颗粒的流体-颗粒相互作用。用该方法对垂直烧结固定床内的气流进行了数值研究。采用多球聚集法在DEM中生成不规则的烧结颗粒。采用浸入边界法和动态单元细化方法，以更高的分辨率描述颗粒周围的流体流动，从而更准确地模拟流体与颗粒的相互作用。

模拟结果显示了不同单粒径和混合粒径范围的烧结床中填料空隙率分布和空气流场。对床层压降进行了模拟，并与相应的实验结果进行了比较。良好的一致性表明，所提出的解析CFD-DEM方法是模拟气固多相系统中不规则大颗粒流粒相互作用的有效工具。

附：英文原文

Title: Coupled simulation of fluid-particle interaction for large complex granules: A resolved CFD-DEM method for modelling the air flow in a vertical fixed bed of irregular sinter particles

Author: Benchao Su, Zhong Zhang, Zhichang Sun , Zongwen Tang, Xiaoxia Xie a, Qi Chen, Hongmei Cao, Xi Yu , Yang Xu, Xing Liu, Bruce D. Hammock

Issue&Volume: 2024/01/12

Abstract: A resolved CFD-DEM method is proposed to simulate the fluid-particle interaction for large complex granules. The air flow in a vertical sinter fixed bed is numerically studied using this method. The multi-sphere clumped method is used to create irregular sinter particles in DEM. The immersed boundary method and dynamic cell refinement are applied to describe the fluid flow around particles with higher resolution, by which the fluid-particle interaction can be simulated more accurately. The simulation results presented the packing voidage distributions and the air flow fields in the sinter beds of different single and mixed particle size ranges. The bed pressure drops were simulated and the results were compared with the corresponding experimental ones. The good agreement indicated that the proposed resolved CFD-DEM method is an effective tool to model the fluid-particle interaction for irregular large granules in the gas-solid multi-phase systems.

DOI: 10.1016/j.partic.2024.01.002

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124000075