Numerical simulations of gas–solid fluidized beds based on the kinetic theory of granular flow exhibit a significant dependence on domain discretization. Bubble formation, bubble size and shape all vary greatly with the discretization, and the use of an inappropriate scale resolution leads to inaccurate predictions of fluidization hydrodynamics. In this study, grid-independent solutions of the two fluid model were examined by comparing the bed expansions obtained from numerical simulations with experimental results and empirical predictions, based on bubbling fluidized beds of Geldart B particles. Grid independence was achieved with a grid resolution equal to 18 times the particle diameter. The simulation results were compared with previously published data for verification purposes. The results of this work should provide a guideline for choosing the appropriate grid size and thereby minimize the time and expense associated with large simulations.

基于颗粒流动力学理论的气固流化床数值模拟显示出对域离散的显着依赖。气泡的形成，气泡的大小和形状随离散而变化很大，并且使用不合适的水垢分辨率会导致流化流体动力学的预测不准确。在这项研究中，通过比较从数值模拟获得的床层膨胀与实验结果和经验预测（基于鼓泡的Geldart B颗粒流化床），比较了两种流体模型的独立于网格的解。网格独立性是通过等于18倍粒径的网格分辨率实现的。为了进行验证，将模拟结果与以前发布的数据进行了比较。