CAJ | 학술논문

基于 FLUENT 软件信息传递模式的 MPI（message passing interface）并行计算平台，通过用户自定义函数（us-er-defined functions，UDFs）文件发展一种拟三维颗粒的计算流体力学（computational fluid dynamics，CFD）-离散单元法（discrete element method，DEM）耦合并行算法。采用该算法数值模拟了脉冲鼓泡床内气固两相流动，揭示了气相鼓泡特性和颗粒混合机制。数值模拟结果表明：该算法具有随计算节点数增加的良好扩展性能和加速性能；在鼓泡过程中，主流两侧的小尺度气流涡逐渐发展为双主涡；单气泡通过床层后，颗粒混合仅局限于射流触及区域；数值模拟结果与相关试验和数值模拟结果吻合较好，表明该并行算法能够较好的模拟稠密颗粒气固两相流中鼓泡和颗粒混合特性，为其在大规模并行集群上的应用奠定基础。
기우 FLUENT 연건신식전체모식적 MPI（message passing interface）병행계산평태，통과용호자정의함수（us-er-defined functions，UDFs）문건발전일충의삼유과립적계산류체역학（computational fluid dynamics，CFD）-리산단원법（discrete element method，DEM）우합병행산법。채용해산법수치모의료맥충고포상내기고량상류동，게시료기상고포특성화과립혼합궤제。수치모의결과표명：해산법구유수계산절점수증가적량호확전성능화가속성능；재고포과정중，주류량측적소척도기류와축점발전위쌍주와；단기포통과상층후，과립혼합부국한우사류촉급구역；수치모의결과여상관시험화수치모의결과문합교호，표명해병행산법능구교호적모의주밀과립기고량상류중고포화과립혼합특성，위기재대규모병행집군상적응용전정기출。
Based on the MPI (Message Passing Interface)platform of FLUENT software,the parallel simulation tech-nique for pseudo three-dimension computational fluid dynamics-discrete element method (CFD-DEM)coupling model was developed through the user-defined functions (UDFs).Numerical simulation of the gas-solid flow in pulsed jet flu-idized bed was conducted by the developed parallel CFD-DEM coupling model,and the bubbling properties for the gas phase and particle mixing properties were revealed.Simulation results showed that the developed parallel CFD-DEM coupling model could have good scalability and speeded-up performance with increase in the number of computing nodes.Small-scale vortices on both sides of the mainstream gradually evolved into two main vortices in the bubbling processes.The particle mixing only occurred in the jet-influenced region after a single bubble had passed through the bed.The simulation results accorded well with the related experimental and simulation results,which showed that this model could well simulate the bubbling and particle mixing properties in dense particulate flows,laying the foundation for the implementation of the model in massively cluster systems.