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Numerical simulation of large particles fluidized bed: TFM versus DEM approach

机译:大颗粒流化床的数值模拟:TFM与DEM方法

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This manucript is based on our recently developed Distinct Element Method (DEM) for simulating the fluidized beds, and compares its results with the other continuum theory based on Two Fluid Model (TFM). Some of the salient features of the DEM are that, (i) it does not require any empirical input for solid's rheology and solid's rheology and solid's pressure, (ii) it can predict the raining of the particles from the bubble roof, and (iii) it gives more realistic bubbles shapes and particle mixing patterns. The only drawback of DEM over TFM is its large computataional time requirements. However, for small to medium scale systems, say up to 40, 000 particles, the computational times required for both the discrete and continuum approaches are comparable. This paper also discusses the artificial viscosity induced due to the first order discretization techniques used to solve TFM equations.
机译:该操作手册基于我们最近开发的用于模拟流化床的离散元方法(DEM),并将其结果与基于两种流体模型(TFM)的其他连续理论相比较。 DEM的一些显着特征是:(i)不需要任何关于固体流变学和固体流变学以及固体压力的经验输入,(ii)它可以预测气泡顶棚的颗粒下雨,并且(iii ),可提供更逼真的气泡形状和颗粒混合模式。与TFM相比,DEM的唯一缺点是其计算时间要求大。但是,对于中小型系统(例如最多40,000个粒子),离散和连续方法所需的计算时间是可比的。本文还讨论了由于用于求解TFM方程的一阶离散化技术而引起的人工粘度。

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