Large eddy simulation of the gasliquid flow in a stirred tank
Large eddy simulation of the gasliquid flow in a stirred tank
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DOI：
10.1002/aic.11516
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发表时间：
2008-08
期刊：
影响因子：
3.7
通讯作者：
Yanhong Zhang;Chao Yang;Z. Mao
中科院分区：
文献类型：
--
作者：
Yanhong Zhang;Chao Yang;Z. Mao
采用大涡模拟（LES）技术和k-epsilon湍流模型来模拟由Rushton叶轮驱动的搅拌槽中的气液湍流。气液两相流的欧拉-欧拉双流体模型，是通过对两种气体（辅助液体相）进行大涡模拟而开发的。通过旋转叶轮到静态挡板的运动来考虑相对挡板的改进的内外迭代算法。控制方程的空间离散化是在圆柱交错网格上进行的。对于 LES，使用传统的 Sniagorinsky,v 子网格模型适用于模拟液相湍流，使用有限差分方法离散化，“，ij'h是用于对流项的三阶QUICK（二次迎风插值对流运动学）方案。将LES的相位分辨预测与实验数据和标准k-epsilon模型的模拟结果进行了比较，表明LES具有比标准k-epsilon模型更好的精度。 k-epsilon 模型。(c) 2008 年美国化学工程师学会。
Both the large eddy simulation (LES) technique and the k-epsilon 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,v simulation for both gas (aid liquid phases. The relative baffles was accounted for through the movement of the rotating impeller to the static baffles 'improved inner-outer iterative algorithm. The spatial discretization of the governing equations was performed on a cylindrical staggered grid. For the LES, a conventional Sniagorinsky,v sub-grid model was adapted to modeling the turbulence of the liquid phase. The momentum and continuity equations were discretized using the finite diffrence method, ",ij'h a third order QUICK (Quadratic Upwind Interpolation tor 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-epsilon model, suggesting that the LES has much better accuracy than the k-epsilon model. (c) 2008 American Institute of Chemical Engineers.