Analysis of transformed fifth order polynomial curve for the contraction of wind tunnel by using OpenFOAM

International Conference on Mechanical, Materials and Renewable Energy

机械制造;材料科学;能源学

Lakshman, R.^1 ; Basak, Ranjan^1

Department of Mechanical Engineering, National Institute of Technology, Sikkim Ravangla, South Sikkim

737139, India^1

关键词: Air flow;    Open sources;    OpenFOAM;    Order polynomials;    Test sections;    Turbulence intensity;    Vertical plane;    Wall shear stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/377/1/012048/pdf
DOI  :  10.1088/1757-899X/377/1/012048

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Contraction is the vital part in wind tunnel hence the designing of contraction is having greater interest among the researchers. Bell and Mehta proposed a fifth order polynomial for the design of the contraction and was widely accepted among the wind tunnel designers. Daniel Brassard proposed a transformed fifth order to provide better results for the fifth order polynomial design by making the radius at the inlet of contraction higher than the radius at the outlet. In this paper the analysis of the transformed fifth order polynomial is investigated by using the open source CFD tool OpenFOAM. Analysis was basically taken considering the uniformity of air flow, wall shear stress distribution and turbulence intensity at contraction outlet and the mid vertical plane at the test section. From the analysis it is found that the transformed model is better compared to the untransformed one in terms of uniformity and turbulence intensity.