2020
DOI: 10.3390/ijerph17145003
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The Drag Crisis Phenomenon on an Elite Road Cyclist—A Preliminary Numerical Simulations Analysis in the Aero Position at Different Speeds

Abstract: The drag crisis phenomenon is the drop of drag coefficient (Cd) with increasing Reynolds number (Re) or speed. The aim of this study was to assess the hypothetical drag crisis phenomenon in a sports setting, assessing it in a bicycle–cyclist system. A male elite-level cyclist was recruited for this research and his competition bicycle, helmet, suit, and shoes were used. A three-dimensional (3D) geometry was obtained with a 3D scan with the subject in a static aero position. A domain with 7 m of length, 2.5 m o… Show more

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Cited by 9 publications
(24 citation statements)
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“…AC d values are in accordance to literature for velocities faster than 5 m/s (0.37 m 2 ≤ AC d ≤ 0.42 m 2 ) for able-bodied cyclists (Grappe et al, 1997;Candau et al, 1999;Defraeye et al, 2010b). In other studies, the AC d ranged between 0.261 and 0.332 m 2 for able-bodied cyclists in the upright, dropped and time-trial position (Zdravkovic et al, 1996;Grappe et al, 1997;Candau et al, 1999;Defraeye et al, 2010a;Beaumont et al, 2018;Forte et al, 2020d). The AC d variations are affected by Cd fluctuations at different speeds (Schlichting and Gersten, 2016;Forte et al, 2020d).…”
Section: Discussionsupporting
confidence: 90%
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“…AC d values are in accordance to literature for velocities faster than 5 m/s (0.37 m 2 ≤ AC d ≤ 0.42 m 2 ) for able-bodied cyclists (Grappe et al, 1997;Candau et al, 1999;Defraeye et al, 2010b). In other studies, the AC d ranged between 0.261 and 0.332 m 2 for able-bodied cyclists in the upright, dropped and time-trial position (Zdravkovic et al, 1996;Grappe et al, 1997;Candau et al, 1999;Defraeye et al, 2010a;Beaumont et al, 2018;Forte et al, 2020d). The AC d variations are affected by Cd fluctuations at different speeds (Schlichting and Gersten, 2016;Forte et al, 2020d).…”
Section: Discussionsupporting
confidence: 90%
“…In other studies, the AC d ranged between 0.261 and 0.332 m 2 for able-bodied cyclists in the upright, dropped and time-trial position (Zdravkovic et al, 1996;Grappe et al, 1997;Candau et al, 1999;Defraeye et al, 2010a;Beaumont et al, 2018;Forte et al, 2020d). The AC d variations are affected by Cd fluctuations at different speeds (Schlichting and Gersten, 2016;Forte et al, 2020d). It is expected that Cd varies about 30% on an able-bodied cyclist between 1 and 22 m/s (Forte et al, 2020d).…”
Section: Discussionmentioning
confidence: 89%
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