Reducing Drag when Cycling

Cyclists can use up to 90% of their energy overcoming drag, which was the motivation behind the work of Ivaylo Nedyalkov at the University of New Hampshire, who was able to measure the force on each individual cyclist in a train formation to determine the best position to reduce your overall drag. Interview with University of Oxford Mathematician Dr Tom Crawford.

This video is part of a collaboration between FYFD and the Journal of Fluid Mechanics featuring a series of interviews with researchers from the APS DFD 2017 conference.

Sponsored by FYFD, the Journal of Fluid Mechanics, and the UK Fluids Network. Produced by Tom Crawford and Nicole Sharp with assistance from A.J. Fillo.

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Featuring:
I. Nedyalkov et al. "Drag and Side Force Reduction for Cyclists in Echelon Formation"
http://meetings.aps.org/link/BAPS.2017.DFD.E17.2

When riding directly behind another cyclist (drafting), a rider can use up to 30\% less energy. This technique is often used during competitions, yet drafting in the presence of a cross wind has not been studied extensively. To investigate the effect of side-wind on drafting, 1:11 scale models of two different cyclists were rapid-prototyped and tested in a wind tunnel. The drag and side forces were measured in formations of up to 4 models. The results suggest that there is a significant decrease in both drag and side force when a cyclist is riding in another cyclist’s wake. Positioning with no off-stream-wise offset result in the largest reduction of forces. When riding in a group of four cyclists, the second and third cyclist experience the largest force reduction. The size of the leading cyclist affects the reduction of forces, particularly when the leading cyclist is smaller. The results are dependent on the Reynolds number, but appear to be independent at higher Reynolds numbers. Initial full scale tests were conducted at the UNH Flow Physics Facility.

Special Thanks To:
Nicole Sharp
A. J. Fillo
Ivo Nedyalkov
Jeremy Gasowski
Velocurean
Norcal Cyclist
J. Mathers

Видео Reducing Drag when Cycling канала Tom Rocks Maths