Modelling boundary-layer transition on wings operating in ground effect at low Reynolds numbers

Simple item page
dc.contributor.authorRoberts, Luke S.
dc.contributor.authorFinnis, Mark V.
dc.contributor.authorKnowles, Kevin
dc.date.accessioned2019-05-31T09:45:51Z
dc.date.available2019-05-31T09:45:51Z
dc.date.issued2018-10-25
dc.description.abstractThe transition-sensitive, three-equation k-kL-ω eddy-viscosity closure model was used for simulations of three-dimensional, single-element and multi-element wing configurations operating in close proximity to the ground. The aim of the study was to understand whether the model correctly simulated the transitional phenomena that occurred in the low Reynolds number operating conditions and whether it offered an improvement over the classical fully turbulent k-ω shear stress transport model. This was accomplished by comparing the simulation results to experiments conducted in a 2.7 m × 1.7 m closed-return, three-quarter-open-jet wind tunnel. The model was capable of capturing the presence of a laminar separation bubble on the wing and predicted sectional forces and surface-flow structures generated by the wings in wind tunnel testing to within 2.5% in downforce and 4.1% in drag for a multi-element wing. It was found, however, that the model produced insufficient turbulent kinetic energy during shear-layer reattachment, predicted turbulent trailing-edge separation prematurely in areas of large adverse pressure gradients, and was found to be very sensitive to inlet turbulence quantities. Despite these deficiencies, the model gave results that were much closer to wind-tunnel tests than those given by the fully turbulent k-ω shear stress transport model, which tended to underestimate downforce. Significant differences between the transitional and fully turbulent models in terms of pressure field, wake thickness and turbulent kinetic energy production were found and highlighted the importance of using transitional models for wings operating at low Reynolds numbers in ground effect. The k-kL-ω model has been shown to be appropriate for the simulation of separation-induced transition on a three-dimensional wing operating in ground effect at low Reynolds number.en_UK
dc.identifier.citationRoberts LS, Finnis MV, Knowles K. (2019) Modelling boundary-layer transition on wings operating in ground effect at low Reynolds numbers. Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering, Volume 233, Issue 11, September 2019, pp. 2820-2837en_UK
dc.identifier.issn0954-4070
dc.identifier.urihttps://doi.org/10.1177/0954407018804007
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14222
dc.language.isoenen_UK
dc.publisherSageen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectBoundary layeren_UK
dc.subjectturbulenceen_UK
dc.subjectclosure modelen_UK
dc.subjectwind tunnelen_UK
dc.subjectlaminar separation bubbleen_UK
dc.subjectReynolds numberen_UK
dc.titleModelling boundary-layer transition on wings operating in ground effect at low Reynolds numbersen_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Modelling_Boundary-layer_Transition-2018.pdf
Size:
3.93 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (CDS)