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Validation of the CFD-DPM solver DPMFoam in OpenFOAM® through analytical, numerical and experimental comparisons

机译：通过分析，数值和实验比较，对OpenFOAM®中的CFD-DPM求解器DPMFoam进行验证

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摘要

Multiphase flows are relevant in several industrial processes mainly because they are present in the production of a large diversity of products. Hence, the availability of accurate numerical modeling tools, able to cope with this type of flows, is of major significance to provide detailed information about the system characteristics, in order to guide the design activity. This study presents a detailed assessment of a multiphase flow solver able to couple Eulerian and Lagrangian phases, the last modeled through the discrete particle method. The numerical code is already implemented in the open source computational fluid dynamics software package OpenFOAM (R). The solver (DPMFoam) is firstly used to simulate the collision between two particles, for which a good correlation was obtained with the theoretical impulse force value. Subsequently, the solver is employed in the simulation of a pseudo 2D gas-solid flow in a fluidized bed. In this case study, the results obtained for the bubble patterns, time-average flow patterns, bed expansion dynamics and particle phase energy analysis are in agreement with the experimental and numerical results available in the literature. In addition, the numerical pressure drop for the fluidized bed is computed and compared with the analytical Ergun's pressure drop equation. The accuracy of the numerical results was found to be sensitive to the solid fraction estimation.
机译：多相流与几种工业过程有关，主要是因为它们存在于多种产品的生产中。因此，能够应对此类流程的精确数值建模工具的可用性对于提供有关系统特性的详细信息以指导设计活动具有重要意义。这项研究对能够耦合欧拉相和拉格朗日相的多相流求解器进行了详细评估，最后一种方法是通过离散粒子方法建模的。数字代码已在开源计算流体动力学软件包OpenFOAM（R）中实现。首先使用求解器（DPMFoam）模拟两个粒子之间的碰撞，并与理论冲力值具有良好的相关性。随后，求解器用于模拟流化床中的二维二维气固两相流。在此案例研究中，获得的气泡模式，时间平均流模式，床膨胀动力学和颗粒相能量分析的结果与文献中的实验和数值结果一致。此外，还计算了流化床的数值压降，并将其与解析的Ergun压降方程进行比较。发现数值结果的准确性对固体分数估计很敏感。

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