Numerical analysis of flow in a 90 degrees bend for a low-speed wind tunnel

T.W.J. Defraeye, P. Moonen, B.J.E. Blocken, J. Carmeliet

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Abstract

The influence of a 90° bend on the characteristics of the flow in a low-speed wind tunnel is investigated with CFD (Computational Fluid Dynamics). CFD validation is performed based on published experimental data. The investigated bend is designed to preserve a uniform velocity inlet profile and a low turbulence level. The influence of bend curvature is assessed. Moreover, the effect of the presence, the number and the spacing of guide vanes is investigated. Two turbulence models are evaluated in the numerical simulations. Bends with a weak curvature and guide vanes are found to perform best in preserving a uniform velocity inlet profile. Comparing guide vanes with equal and variable spacing, the latter results in better flow uniformity in the centre of the duct, downstream of the bend, but not at the outside. A considerable increase in turbulence level is noticed for all configurations investigated. The turbulence has a significant anisotropic character indicating the need for turbulence models that can account for anisotropy in this type of studies.
Original languageEnglish
Title of host publicationProceedings of the12th International Conference on Wind Engineering (12ICWE), 1-6 July 2007, Cairns, Australia
EditorsJ. Cheung, B. Melbourne
Place of PublicationCairns, Australia
PublisherAustralasian Wind Engineering Society
Pages1455-1462
Volume2
Publication statusPublished - 2007
Eventconference; 12th International Conference on Wind Engineering (12ICWE); 2007-07-01; 2007-07-06 -
Duration: 1 Jul 20076 Jul 2007

Conference

Conferenceconference; 12th International Conference on Wind Engineering (12ICWE); 2007-07-01; 2007-07-06
Period1/07/076/07/07
Other12th International Conference on Wind Engineering (12ICWE)

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    Defraeye, T. W. J., Moonen, P., Blocken, B. J. E., & Carmeliet, J. (2007). Numerical analysis of flow in a 90 degrees bend for a low-speed wind tunnel. In J. Cheung, & B. Melbourne (Eds.), Proceedings of the12th International Conference on Wind Engineering (12ICWE), 1-6 July 2007, Cairns, Australia (Vol. 2, pp. 1455-1462). Australasian Wind Engineering Society.