Comparison by computer fluid dynamics of the drag force acting upon two helmets for wheelchair racers

Forte, Pedro; Marinho, Daniel A.; Morouço, Pedro; Pascoal‐Faria, Paula; Barbosa, Tiago M.

doi:10.1063/1.4992669

Cited by 8 publications

(8 citation statements)

References 6 publications

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“…As above-mentioned, no research has been conducted assessing the aerodynamics of wheelchair sprinters by CFD. However, Forte et al [ 1 ] performed a numerical simulation of a road helmet in two different positions at speeds slower than 6.5m/s (near the typical speed reached by wheelchair sprinters in the T52 category). The ACd ranged from 0.024 to 0.034 m 2 .…”

Section: Discussionmentioning

confidence: 99%

“…Pressure drag ranged between 0.38 N and 5.51 N. The total drag ranged between 0.72 N and 8.45 N. In cycling, the pressure drag accounts for 90% of the total drag. Apparel, such as helmets, may help to reduce pressure drag [ 1 ]. Authors also reported that pressure drag is the main contributor for total drag in cycling, running and swimming [ 8 , 35 , 36 ].…”

Section: Discussionmentioning

confidence: 99%

“…Wheelchair sprinting events are some of the most popular races in Paralympics. In these events, athletes compete on racing wheelchairs designed to let them reach their maximal speed [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

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The variations on the aerodynamics of a world-ranked wheelchair sprinter in the key-moments of the stroke cycle: A numerical simulation analysis

et al. 2018

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Biomechanics plays an important role helping Paralympic sprinters to excel, having the aerodynamic drag a significant impact on the athlete’s performance. The aim of this study was to assess the aerodynamics in different key-moments of the stroke cycle by Computational Fluid Dynamics. A world-ranked wheelchair sprinter was scanned on the racing wheelchair wearing his competition gear and helmet. The sprinter was scanned in three different positions: (i) catch (hands in the 12h position on the hand-rim); (ii) the release (hands in the 18h position on the hand-rim) and; (iii) recovery phase (hands do not touch the hand-rim and are hyperextended backwards). The simulations were performed at 2.0, 3.5, 5.0 and 6.5 m/s. The mean viscous and pressure drag components, total drag force and effective area were retrieved after running the numerical simulations. The viscous drag ranged from 3.35 N to 2.94 N, pressure drag from 0.38 N to 5.51 N, total drag force from 0.72 N to 8.45 N and effective area from 0.24 to 0.41 m2. The results pointed out that the sprinter was submitted to less drag in the recovery phase, and higher drag in the catch. These findings suggest the importance of keeping an adequate body alignment to avoid an increase in the drag force.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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The variations on the aerodynamics of a world-ranked wheelchair sprinter in the key-moments of the stroke cycle: A numerical simulation analysis

et al. 2018

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“…Variations in the rider's position may induce variations in the drag force [7]. Equipment, such as helmets, have also influence on the wheelchair aerodynamics [8,9]. Thus, athletes must know the influence of resistive forces at their target speed, and with their racing suits.…”

Section: Introductionmentioning

confidence: 99%

“…The fluid flow velocity was set in inlet portion of the dome surface at the world record speed, 6.08 m/s. Drag force was computed by the following equation: 0.5 ( 5 ) Where F D is the drag force (in N), ρ is the air density (in kg/m 3 ), A d surface area (in m 2 ), v the velocity (in m/s) and C D represents the drag coefficient (dimensionless) [8].…”

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confidence: 99%

Aerodynamics of a wheelchair sprinter racing at the 100m world record pace by CFD

Forte

Marinho

Morais

et al. 2018

AIP Conference Proceedings

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The aim of this study was to analyze aerodynamics in a racing position of a wheelchair-racing sprinter, at the world record speed. The athlete and wheelchair were scanned at the beginning of the propulsive phase position (hands near the handrims at 12h) for the 3D model acquisition. Numerical simulation was run on Fluent, having as output the pressure, viscosity and total drag force, and respective coefficients of drag at the world record speed in T-52 category. Total drag was 7.56N and coefficient of drag was 1.65. This work helped on getting a deeper insight about the aerodynamic profile of a wheelchair-racing athlete, at a 100m world record speed.

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Numerical simulations of a swimmer’s head and cap wearing different types of goggles

Marinho

Willemsen

Barbosa

et al. 2021

Sports Biomechanics

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Comparison by computer fluid dynamics of the drag force acting upon two helmets for wheelchair racers

Cited by 8 publications

References 6 publications

The variations on the aerodynamics of a world-ranked wheelchair sprinter in the key-moments of the stroke cycle: A numerical simulation analysis

The variations on the aerodynamics of a world-ranked wheelchair sprinter in the key-moments of the stroke cycle: A numerical simulation analysis

Aerodynamics of a wheelchair sprinter racing at the 100m world record pace by CFD

Numerical simulations of a swimmer’s head and cap wearing different types of goggles

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