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Large eddy simulation of the gas–liquid flow in a stirred tank
Author(s) -
Zhang Yanhong,
Yang Chao,
Mao ZaiSha
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11516
Subject(s) - turbulence , large eddy simulation , impeller , mechanics , discretization , eulerian path , baffle , flow (mathematics) , rushton turbine , momentum (technical analysis) , upwind scheme , physics , mathematics , thermodynamics , mathematical analysis , finance , lagrangian , economics
Both the large eddy simulation (LES) technique and the k‐ε turbulent model were used to simulate the gas‐liquid turbulent flow in a stirred tank driven by a Rushton impeller. A Eulerian‐Eulerian two‐fluid model for gas–liquid two‐phase flow was developed using the large eddy simulation for both gas and liquid phases. The relative movement of the rotating impeller to the static baffles was accounted for through the improved inner‐outer iterative algorithm. The spatial discretization of the governing equations was performed on a cylindrical staggered grid. For the LES, a conventional Smagorinsky sub‐grid model was adapted to modeling the turbulence of the liquid phase. The momentum and continuity equations were discretized using the finite difference method, with a third order QUICK (Quadratic Upwind Interpolation for Convective Kinematics) scheme used for convective terms. The phase‐resolved predictions of the LES were compared with the experimental data and the simulation results by the standard k ‐ε model, suggesting that the LES has much better accuracy than the k ‐ε model. © 2008 American Institute of Chemical Engineers AIChE J, 2008