基于FLUENT软件信息传递模式的离散颗粒流动的并行算法  

Parallel Computing of Discrete Particle Flows Based on Information Communication Model of FLUENT Platform

作　　者：任立波[1] 韩吉田[1] 何海澜 

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]兰州兰石换热设备有限责任公司,甘肃兰州730050

出　　处：《高校化学工程学报》2015年第4期963-970,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51076084)

摘　　要：基于FLUENT软件信息传递模式的MPICH2并行计算平台,在二次开发框架内通过用户自定义函数(User-Defined Function)文件发展了一种非结构网格下拟三维颗粒的CFD-DEM耦合并行算法,该算法具有随CPU核数增加的较佳扩展性和加速性能。通过构建空隙率标量场、重组基于局部平均并考虑气-固相互作用的气相控制方程,气相控制方程的求解稳定性与收敛性明显改善。FLUENT软件和UDF文件分别实现了气相控制方程的并行求解和DEM并行算法,其中DEM并行算法中相邻子域间的颗粒信息传递由MPICH2平台的信息传递宏完成。将该算法应用于球形颗粒鼓泡床及锥型喷动床的气固两相流数值模拟中,数值模拟结果与有关试验结果吻合良好,表明该算法能较好地处理稠密颗粒气固两相流动。This paper presents parallel simulation techniques for the pseudo three-dimensional CFD-DEM model based on the MPICH2 platform of FLUENT software. This parallel model has good scalability with the increase of CPU numbers, and parallel computing can be speeded up with the increase of compute nodes. The convergence of the governing equations was improved by constructing a void fraction scalar field and reorganizing the gas-phase governing equations, which followed a volume-averaged form of the two-fluid model. The parallel solution of the gas-phase governing equations and the DEM were implemented by a standard module and UDF（User-Defined Function）, respectively. In the DEM computing, the particle message passing between neighboring subdomains was completed by message-passing macros. The parallel CFD-DEM model was applied in gas-solid two-phase flow simulation on unstructured meshes and the results are in good agreement with related experiments, which shows that this model can be applied in studying dense particulate flows.

关 键 词：拟三维 离散单元法 计算流体力学 并行计算 

分 类 号：TK121[动力工程及工程热物理—工程热物理]