Flow visualisation in swimming practice using small air bubbles

Josje van Houwelingen; Rudie P.J. Kunnen; Willem van de Water; Ad P.C. Holten; Gert Jan F. van Heijst; Herman J.H. Clercx

doi:10.1007/s12283-019-0306-5

Flow visualisation in swimming practice using small air bubbles

Josje van Houwelingen, Rudie P.J. Kunnen, Willem van de Water, Ad P.C. Holten, Gert Jan F. van Heijst, Herman J.H. Clercx (Corresponding author)

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

A non-harmful system to visualize the flow around an entire swimmer in a regular swimming pool is developed. Small air bubble tracers are injected through the bottom of the swimming pool in a prescribed measurement area. The motion of these bubbles, which will be largely induced by the swimmer’s motion, is captured by a camera array. The two-dimensional velocity field of the water at arbitrary planes of interest can be resolved using a refocussing method in combination with an optical visualisation method, based on particle image velocimetry, which is commonly used in fluid dynamics research. Using this technique, it is possible to visualize coherent flow structures produced during swimming; it is demonstrated here for the dolphin kick.

Original language	English
Article number	13
Number of pages	8
Journal	Sports Engineering
Volume	22
Issue number	2
DOIs	https://doi.org/10.1007/s12283-019-0306-5
Publication status	Published - 1 Jun 2019

Keywords

Dolphin kick
Flow visualisation
Swimming
Synthetic aperture PIV
Vortices

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10.1007/s12283-019-0306-5

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title = "Flow visualisation in swimming practice using small air bubbles",

abstract = "A non-harmful system to visualize the flow around an entire swimmer in a regular swimming pool is developed. Small air bubble tracers are injected through the bottom of the swimming pool in a prescribed measurement area. The motion of these bubbles, which will be largely induced by the swimmer{\textquoteright}s motion, is captured by a camera array. The two-dimensional velocity field of the water at arbitrary planes of interest can be resolved using a refocussing method in combination with an optical visualisation method, based on particle image velocimetry, which is commonly used in fluid dynamics research. Using this technique, it is possible to visualize coherent flow structures produced during swimming; it is demonstrated here for the dolphin kick.",

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AU - Kunnen, Rudie P.J.

AU - van de Water, Willem

AU - Holten, Ad P.C.

AU - van Heijst, Gert Jan F.

AU - Clercx, Herman J.H.

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Flow visualisation in swimming practice using small air bubbles

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