000022501 001__ 22501
000022501 005__ 20170724144652.0
000022501 04107 $$aeng
000022501 046__ $$k2017-07-04
000022501 100__ $$aBlocken, Bert
000022501 24500 $$aNumerical analysis of drag of different cyclist positions for hill descent

000022501 24630 $$n7.$$p7th European and African Conference on Wind Engineering 
000022501 260__ $$bl'Association pour l'Ingénierie du Vent
000022501 506__ $$arestricted
000022501 520__ $$2eng$$aAs elite athletes are continuously looking for the best performance, they may take additional risks as illustrated by the particular descent position held by professional cyclist Chris Froome during the 2016 Tour de France, in which he sat on the top tube with his torso bent over the handlebar. At that time, numerous sports commentators and cyclist fans claimed that this position, although dangerous, would be aerodynamically superior. Using detailed simulations with Computational Fluid Dynamics (CFD) based on grid-convergence analysis and validation with wind-tunnel tests, eight different positions are compared, including three variants of the “Froome position”, two variants of a second position (lower part of the body behind the saddle) and three variants of a third position (rider seated on the saddle but with the upper body (waist, torso, neck, head) as much as possible parallel to the ground). The latter are termed “safe descent positions”. The drag induced for each position is compared with the drag of the same cyclist in optimal time trial position and in upright position. The results indicate that the Froome position, although more dangerous, is not aerodynamically superior compared to the best of the safe descent positions.

000022501 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000022501 653__ $$aCycling aerodynamics; Computational Fluid Dynamics; CFD validation; sports aerodynamics.

000022501 7112_ $$a7th European and African Conference on Wind Engineering$$cLiège, BE$$d2017-07-04 / 2017-07-07$$gEACWE2017
000022501 720__ $$aBlocken, Bert$$iMarchal, Thierry$$iAndrianne, Thomas$$iToparlar, Yasin$$iDruenen, Thijs van
000022501 8560_ $$ffischerc@itam.cas.cz
000022501 8564_ $$s75884$$uhttps://invenio.itam.cas.cz/record/22501/files/11.pdf$$yOriginal version of the author's contribution in proceedings, id 11, section .
000022501 962__ $$r22493
000022501 980__ $$aPAPER