Euler-Lagrange method is powerful for studying dense gas-solid flow, where the Eulerian grid is typically 3–5 times of particle diameter to ensure the accuracy of information mapping between gas and solid phases. This condition limits its applications in simulating reactors with complex geometries which require the use of Eulerian grids that are comparative to or smaller than particle diameter. In this study, eight methods for mapping discrete particle information to continuous fluid field were compared first via the simulation of a packed bed, their pros and cons were analyzed and discussed in detail; A kernel function method (the normalized kernel function method II, NKFMII) was then selected to simulate the hydrodynamics and heat transfer of gas-solid bubbling fluidized beds, the results not only validated NKFMII for interphase information mapping but also indicated that a grid-size-independent solution can be achieved; Finally, in order to balance the computational efficiency and accuracy a hybrid particle centroid method (PCM) and NKFMII method was proposed to achieve the interphase information mapping and then to simulate the hydrodynamics of a fluidized bed with immersed tubes, the ability of local grid refinement and the effectiveness of the coupled PCM and NKFMII method were demonstrated. This study proved that Euler-Lagrange simulation with local grid refinement is able to simulate gas-solid reactors with complex geometries.

Euler-Lagrange 方法对于研究稠密的气固流动非常有效，欧拉网格通常是颗粒直径的 3-5 倍，以确保气固相信息映射的准确性。这种情况限制了其在模拟具有复杂几何形状的反应器中的应用，这些几何形状需要使用与颗粒直径相当或小于颗粒直径的欧拉网格。本研究首先通过填充床模拟比较了8种将离散粒子信息映射到连续流体场的方法，并详细分析和讨论了它们的优缺点；然后选择核函数方法（归一化核函数方法II，NKFMII）来模拟气固鼓泡流化床的流体动力学和传热，结果不仅验证了 NKFMII 用于相间信息映射，而且表明可以实现与网格大小无关的解决方案；最后，为了平衡计算效率和精度，提出了混合粒子质心法（PCM）和NKFMII方法来实现相间信息映射，然后模拟沉管流化床的流体动力学，局部网格细化能力并证明了耦合 PCM 和 NKFMII 方法的有效性。这项研究证明，具有局部网格细化的 Euler-Lagrange 模拟能够模拟具有复杂几何形状的气固反应器。为了平衡计算效率和精度，提出了混合粒子质心法（PCM）和NKFMII方法来实现相间信息映射，然后模拟沉管流化床的流体动力学、局部网格细化能力和证明了耦合 PCM 和 NKFMII 方法的有效性。这项研究证明，具有局部网格细化的 Euler-Lagrange 模拟能够模拟具有复杂几何形状的气固反应器。为了平衡计算效率和精度，提出了混合粒子质心法（PCM）和NKFMII方法来实现相间信息映射，然后模拟沉管流化床的流体动力学、局部网格细化能力和证明了耦合 PCM 和 NKFMII 方法的有效性。这项研究证明，具有局部网格细化的 Euler-Lagrange 模拟能够模拟具有复杂几何形状的气固反应器。