脉冲鼓泡床内鼓泡和颗粒混合特性的CFD-DEM数值模拟

doi:10.6040/j.issn.1672-3961.0.2014.235

山东大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (2): 62-66.doi: 10.6040/j.issn.1672-3961.0.2014.235

脉冲鼓泡床内鼓泡和颗粒混合特性的CFD-DEM数值模拟

任立波^1,2, 尚立宝², 闫日雄³, 何海澜², 赵红霞¹, 韩吉田¹

1. 山东大学能源与动力工程学院, 山东济南 250061;
2. 上海板换机械设备有限公司, 上海 201508;
3. 中国寰球工程公司, 北京 100012

收稿日期:2014-08-26 修回日期:2015-01-04 出版日期:2015-04-20 发布日期:2014-08-26
通讯作者: 韩吉田(1961-),男,山东莱阳人,教授,博导,主要研究方向为多相流与传热.E-mail:jthan@sdu.edu.cn E-mail:jthan@sdu.edu.cn
作者简介:任立波(1983-),男,山东寿光人,博士研究生,主要研究方向为气固两相流.E-mail:by101010@163.com
基金资助:
国家自然科学基金资助项目(51076084, 51306104)

CFD-DEM simulation of bubbling and particle mixing properties in pulsed jet fluidized bed

REN Libo^1,2, SHANG Libao², YAN Rixiong³, HE Hailan², ZHAO Hongxia¹, HAN Jitian¹

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China;
2. Shanghai Heat Transfer Equipment Limited Company, Shanghai 201508, China;
3. China Huanqiu Contracting & Engineering Corporation, Beijing 100012, China

Received:2014-08-26 Revised:2015-01-04 Online:2015-04-20 Published:2014-08-26

摘要/Abstract

摘要： 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(user-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。

关键词: 鼓泡, 离散单元法, 颗粒混合, 并行计算, 计算流体力学

Abstract: Based on the MPI (Message Passing Interface) platform of FLUENT software, the parallel simulation technique 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 fluidized 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.

Key words: parallel computing, discrete element method, bubbling, computational fluid dynamics, particle mixing

中图分类号:

TK121

任立波, 尚立宝, 闫日雄, 何海澜, 赵红霞, 韩吉田. 脉冲鼓泡床内鼓泡和颗粒混合特性的CFD-DEM数值模拟[J]. 山东大学学报(工学版), 2015, 45(2): 62-66.

REN Libo, SHANG Libao, YAN Rixiong, HE Hailan, ZHAO Hongxia, HAN Jitian. CFD-DEM simulation of bubbling and particle mixing properties in pulsed jet fluidized bed[J]. JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE), 2015, 45(2): 62-66.

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脉冲鼓泡床内鼓泡和颗粒混合特性的CFD-DEM数值模拟

CFD-DEM simulation of bubbling and particle mixing properties in pulsed jet fluidized bed

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