A novel coupling approach for DEM/CFD simulations accounting for the heterogeneous and anisotropic nature of bulk solids (C05)

一种新颖的 DEM/CFD 模拟耦合方法，可解释散装固体的非均质性和各向异性性质 (C05)

• 批准号: 447219671
• 金额: --
• 依托单位: Institut für Verfahrenstechnik
• 依托单位国家: 德国
• 项目类别: CRC/Transregios
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/447219671?language=en
• 关键词: novel; coupling; approach; DEM; CFD

C5 will derive new models for an improved momentum coupling, considering the anisotropic nature of the morphology of the particle assembly, for DEM/CFD. The motivation for the project is that currently only strongly simplified models are used for the description of gas phase flow field in large-scale DEM/CFD simulations. The exact geometry of the individual particles is not taken into account in the description of the gas phase, instead the granular phase is represented just by the assumption of a spatially distributed, but isotropic, porosity. This deficiency will be ultimately eliminated by C5. For this purpose, the gas volume fraction (local porosity) in the gas-particle interaction terms will be replaced by a second order tensor to account for the anisotropy of the gas volume fraction and its gradient in each spatial direction.

C5将为DEM/CFD推导出改进动量耦合的新模型，考虑到颗粒组装形态的各向异性性质。该项目的动机是，目前只有强烈简化的模型用于描述气相流场的大规模DEM/CFD模拟。在气相的描述中没有考虑单个颗粒的确切几何形状，而是仅通过空间分布但各向同性的孔隙率的假设来表示颗粒相。这种缺陷最终将通过C5消除。为此，气体-颗粒相互作用项中的气体体积分数（局部孔隙度）将被二阶张量代替，以说明气体体积分数的各向异性及其在每个空间方向上的梯度。