SCI和EI收录∣中国化工学会会刊

›› 2016, Vol. 24 ›› Issue (9): 1122-1134.

• Fluid Dynamics and Transport Phenomena • 上一篇    下一篇

Numerical simulation of stirred tanks using a hybrid immersed-boundary method

Shengbin Di1,2, Ji Xu1, Qi Chang1,3, Wei Ge1   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • 收稿日期:2015-08-29 修回日期:2016-03-18 出版日期:2016-09-28 发布日期:2016-11-11
  • 通讯作者: Wei Ge,E-mail address:wge@ipe.ac.cn
  • 基金资助:
    Supported by the National Natural Science Foundation of China (21225628, 51106168, 11272312) and the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDA07080000).

Numerical simulation of stirred tanks using a hybrid immersed-boundary method

Shengbin Di1,2, Ji Xu1, Qi Chang1,3, Wei Ge1   

  1. 1 State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;
    2 University of Chinese Academy of Sciences, Beijing 100049, China;
    3 School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2015-08-29 Revised:2016-03-18 Online:2016-09-28 Published:2016-11-11
  • Supported by:
    Supported by the National Natural Science Foundation of China (21225628, 51106168, 11272312) and the "Strategic Priority Research Program" of the Chinese Academy of Sciences (XDA07080000).

摘要: Conventionally, multiple reference frame (MRF) method and sliding mesh (SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary (IB) technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units (CPUs) and graphics processing units (GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation (LES). Finally the proposed methodology is coupled with discrete element method (DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.

关键词: Immersed-boundary method, CPU-GPU hybrid computing, Stirred tank, Large eddy simulation

Abstract: Conventionally, multiple reference frame (MRF) method and sliding mesh (SM) method are used in the simulation of stirred tanks, however, both methods have limitations. In this study, a hybrid immersed-boundary (IB) technique is developed in a finite difference context for the numerical simulation of stirred tanks. IBs based on Lagrangian markers and solid volume fractions are used for moving and stationary boundaries, respectively, to achieve optimal efficiency and accuracy. To cope with the high computational cost in the simulation of stirred tanks, the technique is implemented on computers with hybrid architecture where central processing units (CPUs) and graphics processing units (GPUs) are used together. The accuracy and efficiency of the present technique are first demonstrated in a relatively simple case, and then the technique is applied to the simulation of turbulent flow in a Rushton stirred tank with large eddy simulation (LES). Finally the proposed methodology is coupled with discrete element method (DEM) to accomplish particle-resolved simulation of solid suspensions in small stirred tanks. It demonstrates that the proposed methodology is a promising tool in simulating turbulent flow in stirred tanks with complex geometries.

Key words: Immersed-boundary method, CPU-GPU hybrid computing, Stirred tank, Large eddy simulation

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