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 journalArticleAcademicpeer-review

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.
LanguageEnglish
Article number13
Number of pages8
JournalSports Engineering
Volume22
Issue number2
DOIs
StatePublished - 1 Jun 2019

Fingerprint

Swimming Pools
Swimming pools
Flow Visualization
Flow visualization
Bubbles (in fluids)
Bubble
Air
Dolphins
Motion
Rheology
Hydrodynamics
Flow structure
Fluid Dynamics
Fluid dynamics
Velocity measurement
Velocity Field
Visualization
Camera
Cameras
Entire

Keywords

  • Dolphin kick
  • Flow visualisation
  • Swimming
  • Synthetic aperture PIV
  • Vortices

Cite this

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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’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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Flow visualisation in swimming practice using small air bubbles. / van Houwelingen, Josje; Kunnen, Rudie P.J.; van de Water, Willem; Holten, Ad P.C.; van Heijst, Gert Jan F.; Clercx, Herman J.H. (Corresponding author).

In: Sports Engineering, Vol. 22, No. 2, 13, 01.06.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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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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AB - 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.

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