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首页> 外文会议>Italian Conference on Chemical and Process Engineering(ICheaP-6) vol.2; 20030608-11; Pisa(IT) >A numerical tool for the simulation of fluidized bed hydrodynamics based on a combined DEM-CFD approach
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A numerical tool for the simulation of fluidized bed hydrodynamics based on a combined DEM-CFD approach

机译：基于组合DEM-CFD方法的流化床流体动力学模拟数值工具

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摘要

The aim of this work is to describe the methodology and the results of a new advanced modeling technique, based on the coupling of the Distinct Element Method (DEM) for particle simulation and a CFD algorithm for fluid motion simulation, capable to simulate the main hydrodynamic behavior of fluidized beds, for applications in physical and chemical reacting systems. Although the fluidization process is widely used for several industrial processes, a theoretical understanding of the underlying phenomena is not well developed yet. Accurate numerical simulations can help to establish reliable models for better performance predictions and more accurate scale-up of the process. In this work, a combined DEM-CFD approach for the simulation of the two-phase motion occurring in fluidized beds is briefly described. The algorithm provides information on the particle-particle and particle-fluid microscopic interactions. These small-scale phenomena are responsible for the typical macroscopic motion patterns occurring in fluidized beds, such as particulate and aggregative expansion, bubble motion and slug motion. The main numerical issues of the DEM-CFD approach are discussed in order to examine possibilities and limitations of the model. Then an application to a case of interest for several industrial plants, i.e. the fluidization of a mixture of solids, is proposed. The stable segregated initial configuration for a mixture of particles differing in density (lighter component above) is examined and discussed. The simulation of the hydrodynamics of the two phases allows the mechanisms of fluidization of mixtures (mixing and segregation) to be carefully studied. The calculated values of the fundamental parameters are compared to the theoretical predictions, showing the encouraging possibilities offered by DEM-CFD based numerical simulations.
机译：这项工作的目的是基于粒子模拟的离散元方法（DEM）和流体运动模拟的CFD算法的结合，描述一种新的高级建模技术的方法和结果，该模拟能够模拟主要流体动力流化床的特性，用于物理和化学反应系统。尽管流化过程已广泛用于几种工业过程，但对潜在现象的理论理解尚不完善。精确的数值模拟可以帮助建立可靠的模型，以更好地预测性能并更准确地按比例放大过程。在这项工作中，简要描述了结合的DEM-CFD方法来模拟流化床中发生的两相运动。该算法提供了有关粒子-粒子和粒子-流体微观相互作用的信息。这些小规模现象是造成流化床中典型的宏观运动模式的原因，例如颗粒和聚集的膨胀，气泡运动和团状运动。为了检查模型的可能性和局限性，讨论了DEM-CFD方法的主要数值问题。然后，提出了对几种工业工厂感兴趣的情况的应用，即固体混合物的流化。研究并讨论了密度不同的颗粒混合物的稳定分离初始构型（上述较轻的组分）。对两相的流体动力学进行仿真，可以仔细研究混合物的流化机理（混合和分离）。将基本参数的计算值与理论预测值进行比较，显示出基于DEM-CFD的数值模拟所提供的令人鼓舞的可能性。

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