Flow visualisation in swimming practice using small air bubbles

被引:3
|
作者
van Houwelingen, Josje [1 ,2 ]
Kunnen, Rudie P. J. [1 ,2 ]
van de Water, Willem [1 ,2 ]
Holten, Ad P. C. [1 ,2 ]
van Heijst, GertJan F. [1 ,2 ]
Clercx, Herman J. H. [1 ,2 ]
机构
[1] Eindhoven Univ Technol, Dept Appl Phys, POB 513, NL-5600 MB Eindhoven, Netherlands
[2] Eindhoven Univ Technol, JM Burgers Ctr Fluid Dynam, POB 513, NL-5600 MB Eindhoven, Netherlands
关键词
Swimming; Flow visualisation; Synthetic aperture PIV; Dolphin kick; Vortices; UNSTEADY-FLOW; FIELD; HAND;
D O I
10.1007/s12283-019-0306-5
中图分类号
G8 [体育];
学科分类号
04 ; 0403 ;
摘要
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.
引用
收藏
页数:8
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