Sport Aerodynamics: on the Relevance of Aerodynamic Force Modelling versus Wind Tunnel Testing.

Barelle, Caroline

doi:10.5772/21586

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…Therefore, it is more beneficial to control the frontal area rather than the wetted area. 38 In some applications, such as automotive design, it can be advantageous to extend surfaces ahead or aft of the wheels to better control the pressure distribution as well as to delay on-set of flow separation. 39 Conversely extending the surface without changing the form results in an increase in drag from an increase in skin friction.…”

Section: Discussionmentioning

confidence: 99%

A trajectory simulation model to analyse the factors influencing the descent of a Skeleton athlete

Vracas

Short

Banks

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part P:

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Subtle differences in aerodynamic drag, ice friction and sprint start, all influenced by the skill and physique of athletes, determine the descent time and hence competitive success in the sport of Skeleton. A trajectory based simulation was created by parameterising the geometry of the Altenberg Ice Track in Saxony, Germany to find the physically realistic descent time that captures the physics of the aerodynamic drag, ice friction and sprint start. A sensitivity study was used to analyse the influence of each factor on the overall performance down a fixed mid-line trajectory. Comparisons are made to the actual descent times to confirm applicability for a set of male and female sliders. It was found that the combined mass of the athlete and sled should be maximised within the rules, the initial velocity from the push should be as fast as possible, the aerodynamic drag should be optimised for each athlete and the ice friction of the runners reduced to their lowest limit. If each variable is optimum, then the final race standings will depend solely on the skill of the athlete traversing the ice track by finding the ‘best’ trajectory.

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Section: Discussionmentioning

confidence: 99%

A trajectory simulation model to analyse the factors influencing the descent of a Skeleton athlete

Vracas

Short

Banks

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part P:

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A New Wind Tunnel Facility Dedicated to Sports Technology Research and Development

Bäckström

Carlsson

Danvind

et al. 2016

Procedia Engineering

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Open-jet facility for bio-inspired micro-air-vehicle flight experiment at low speed and high turbulence intensity

Liu,

Yang

2024

Adv. Aerodyn.

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Bio-inspired micro-air-vehicles (MAVs) usually operate in the atmospheric boundary layer at a low Reynolds number and complex wind conditions including large-scale turbulence, strong shear, and gusts. We develop an open jet facility (OJF) to meet the requirements of MAV flight experiments at very low speed and high turbulence intensity. Powered by a stage-driven fan, the OJF is capable of generating wind speeds covering 0.1 – 16.8 m/s, with a velocity ratio of 100:1. The contraction section of the OJF is designed using an adjoint-driven optimization method, resulting in a contraction ratio of 3:1 and a length-to-diameter ratio of 0.75. A modularized design of the jet nozzle can produce laminar or high-turbulence wind conditions. Flow field calibration results demonstrate that the OJF is capable of producing a high-quality baseline flow with steady airspeed as low as 0.1 m/s, uniform region around 80% of the cross-sectional test area, and turbulence intensity around 0.5%. Equipped with an optimized active grid (AG), the OJF can reproduce controllable, fully-developed turbulent wind conditions with the turbulence intensity up to 24%, energy spectrum satisfying the five-thirds power law, and the uniform region close to 70% of the cross-sectional area of the test section. The turbulence intensity, integral length scale, Kolmogorov length scale, and mean energy dissipation rate of the generated flow can be adjusted by varying the area of the triangular through-hole in the wings of the AG.

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Sport Aerodynamics: on the Relevance of Aerodynamic Force Modelling versus Wind Tunnel Testing.

Cited by 4 publications

References 22 publications

A trajectory simulation model to analyse the factors influencing the descent of a Skeleton athlete

A trajectory simulation model to analyse the factors influencing the descent of a Skeleton athlete

A New Wind Tunnel Facility Dedicated to Sports Technology Research and Development

Open-jet facility for bio-inspired micro-air-vehicle flight experiment at low speed and high turbulence intensity

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