Quantification of numerical uncertainty in computational fluid dynamics modelling of hydrocyclones

被引：30

作者：

Karimi, M. ^{[1
]}

Akdogan, G. ^{[1
]}

Dellimore, K. H. ^{[2
]}

Bradshaw, S. M. ^{[1
]}

机构：

[1] Univ Stellenbosch, Dept Proc Engn, ZA-7602 Stellenbosch, South Africa

[2] Univ Stellenbosch, Dept Mech & Mechatron Engn, ZA-7602 Stellenbosch, South Africa

来源：

COMPUTERS & CHEMICAL ENGINEERING | 2012年 / 43卷

关键词：

Hydrocyclone; Computational fluid dynamics; Numerical uncertainty; Grid Convergence Index; AIR CORE; FLOW; CFD;

D O I：

10.1016/j.compchemeng.2012.04.009

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Large Eddy Simulations of the flow through a hydrocyclone are used to demonstrate that the Grid Convergence Index (GCI) is a practical method of accounting for numerical uncertainty. The small values of GCI (<7.2%) associated with the tangential velocity predictions suggest that numerical uncertainty due to discretization error does not greatly contribute to the disagreement between simulation and experiment in the tangential direction. The large values of GCI (<303.2%) associated with the axial velocity predictions imply that uncertainty clue to discretization error is significant and further mesh refinement can yield better agreement in the axial direction. This was demonstrated through additional grid refinement which produced a reduction in the GCI of as much as 256.6% and a drop in the overall average difference between simulation and experimental of more than 36%. Overall, these results suggest the GCI is a useful tool for quantifying numerical uncertainty in CFD simulations. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：45 / 54

页数：10

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