Aerodynamic study of time-trial helmets in cycling racing using CFD analysis
(Aerodynamische Studie von Zeitfahrhelmen für Radrennen mit CFD-Analyse)
The aerodynamic drag of three different time-trial cycling helmets was analyzed numerically for two different cyclist head positions. Computational Fluid Dynamics (CFD) methods were used to investigate the detailed airflow patterns around the cyclist for a constant velocity of 15?m/s without wind. The CFD simulations have focused on the aerodynamic drag effects in terms of wall shear stress maps and pressure coefficient distributions on the cyclist/helmet system. For a given head position, the helmet shape, by itself, obtained a weak effect on a cyclists aerodynamic performance (<1.5%). However, by varying head position, a cyclist significantly influences aerodynamic performance; the maximum difference between both positions being about 6.4%. CFD results have also shown that both helmet shape and head position significantly influence drag forces, pressure and wall shear stress distributions on the whole cyclists body due to the change in the near-wake behavior and in location of corresponding separation and attachment areas around the cyclist.
© Copyright 2018 Journal of Biomechanics. Elsevier. Alle Rechte vorbehalten.
|Schlagworte:||Radsport Sportgerät Biomechanik Widerstand Analyse Kopf Vortrieb|
|Notationen:||Ausdauersportarten Naturwissenschaften und Technik|
|Veröffentlicht in:||Journal of Biomechanics|