Aerodynamic study of time-trial helmets in cycling racing using CFD analysis
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 cyclist`s 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 cyclist`s 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. Kaikki oikeudet pidätetään.
Aiheet: | pyöräily urheiluvälineet biomekaniikka vastus analyysi pää työntövoima |
---|---|
Aihealueet: | kestävyys urheilu tekniset ja luonnontieteet |
Tagging: | Helm |
DOI: | 10.1016/j.jbiomech.2017.10.042 |
Julkaisussa: | Journal of Biomechanics |
Julkaistu: |
2018
|
Vuosikerta: | 67 |
Sivuja: | 1-8 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |