Large eddy simulation of liquid flow in a stirred tank with improved inner-outer iterative algorithm

In this study, the large eddy simulation technique was applied on the flow in a baffled stirred tank driven by a Rushton turbine at Re=29000. The interaction between the rotating impeller and the static baffles was accounted for by means of the improved inner-outer iterative algorithm. The sub-grid scale model was a conventional Smagorinsky model. The numerical solution of the governing equations was conducted in a cylindrical staggered grid. The momentum and the continuity equations were discretized using the finite difference method, with a third-order QUICK scheme used for convective terms. The phase-resolved predictions were compared with the experimental data of Wu and Patterson and good agreement was observed for both the mean and the turbulence quantities. They were much better than the Reynolds-averaged Navier-Stokes model including the Reynolds Stress Model for simulating the turbulence. The study also suggests the feasibility of LES in combination with the improved inner-outer iterative algorithm for the simulation of turbulent flow in stirred tanks.

[1]  Wj Wang,et al.  Numerical simulation of gas-liquid flow in a stirred tank with a Rushton impeller , 2002 .

[2]  Sumanta Acharya,et al.  Two-Equation Turbulence Modeling for Impeller Stirred Tanks , 2001 .

[3]  Hui Meng,et al.  Validation of CFD simulations of a stirred tank using particle image velocimetry data , 1998 .

[4]  George Papadakis,et al.  Large Eddy Simulation of Turbulent Flow in a Rushton Impeller Stirred Reactor with Sliding-Deforming Mesh Methodology , 2004 .

[5]  Zai-Sha Mao,et al.  Numerical and Experimental Investigation of Liquid-Liquid Two-Phase Flow in Stirred Tanks , 2005 .

[6]  Kevin J. Myers,et al.  The laminar and turbulent flow pattern of a pitched blade turbine , 1996 .

[7]  Ying Liao,et al.  Large Eddy simulations of a stirred tank using the lattice Boltzmann method on a nonuniform grid , 2002 .

[8]  Laszlo Fuchs,et al.  Large eddy simulation of flow in stirred vessels , 2002 .

[9]  Zai-Sha Mao,et al.  Numerical study of solid-liquid two-phase flow in stirred tanks with Rushton impeller - (II) Prediction of critical impeller speed , 2004 .

[10]  L. Fuchs,et al.  Large eddy simulations of the turbulent flow in a stirred reactor , 1998 .

[11]  F. Wang,et al.  Numerical Study of Solid-Liquid Two-Phase Flow in Stirred Tanks with Rushton Impeller (I) Formulation and Simulation of Flow Field , 2004 .

[12]  J. Smagorinsky,et al.  GENERAL CIRCULATION EXPERIMENTS WITH THE PRIMITIVE EQUATIONS , 1963 .

[13]  Eric Serre,et al.  A three-dimensional pseudospectral method for rotating flows in a cylinder , 2001 .

[14]  S. Balachandar,et al.  Large Eddy Simulation of Flow in a Stirred Tank , 2001 .

[15]  J. Eggels,et al.  Direct and large-eddy simulation of turbulent fluid flow using the lattice-Boltzmann scheme , 1996 .

[16]  Alberto Brucato,et al.  Large-eddy simulation of turbulent flow in an unbaffled stirred tank driven by a Rushton turbine , 2005 .

[17]  Jos Derksen,et al.  Large eddy simulations on the flow driven by a Rushton turbine , 1999 .

[18]  G. K. Patterson,et al.  Laser-Doppler measurements of turbulent-flow parameters in a stirred mixer , 1989 .

[19]  Long Fan,et al.  Numerical simulation of laminar flow field in a stirred tank , 2004 .

[20]  Michael Yianneskis,et al.  Hydrodynamic characteristics of dual Rushton impeller stirred vessels , 1996 .

[21]  Wj Wang,et al.  Numerical Simulation of the Whole Three-Dimensional Flow in a Stirred Tank with Anisotropic Algebraic Stress Model , 2002 .

[22]  L. A. Cutter.  Flow and turbulence in a stirred tank , 1966 .

[23]  Laszlo Fuchs,et al.  Influence of impeller type on the flow structure in a stirred reactor , 2000 .