Unsteady flow field around a human hand and propulsive force in swimming

Matsuuchi K, Miwa T, Nomura T, Sakakibara J, Shintani H, Ungerechts B (2009)
Journal of Biomechanics 42(1): 42-47.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Matsuuchi, K.; Miwa, T.; Nomura, T.; Sakakibara, J.; Shintani, H.; Ungerechts, BodoUniBi
Abstract / Bemerkung
Much effort has been undertaken for the estimation of propulsive force of swimmers in the front crawl. Estimation is typically based on steady flow theory: the so-called quasi-steady analysis. Flow fields around a swimmer, however, are extremely unsteady because the change direction of hand produces unsteady vortex motions. To evaluate the force correctly, it is necessary to know the unsteady properties determined from the vortex dynamics because that unsteadiness is known to make the force greater. Unsteady flow measurements were made for this study using a sophisticated technique called particle image velocimetry (PIV) in several horizontal planes for subjects swimming in a flume. Using that method, a 100 time-sequential flow fields are obtainable simultaneously. Each flow held was calculated from two particle images ming the cross-correlation method. The intensity of vortices and their locations were identified. A strong vortex was generated near the hand and then shed by directional change of the hand in the transition phase from in-sweep to out-sweep. When the vortex was shed, a new vortex rotating in the opposite direction around the hand was created. The pair of vortices induced the velocity component in the direction opposite to the swimming. Results of this study show that the momentum change attributable to the increase in this velocity component is the origin of thrust force by the hand. (C) 2008 Elsevier Ltd. All rights reserved.
Stichworte
Front crawl; Unsteady flow; PIV; Propulsive force
Erscheinungsjahr
2009
Zeitschriftentitel
Journal of Biomechanics
Band
42
Ausgabe
1
Seite(n)
42-47
ISSN
0021-9290
Page URI
https://pub.uni-bielefeld.de/record/1635610

Zitieren

Matsuuchi K, Miwa T, Nomura T, Sakakibara J, Shintani H, Ungerechts B. Unsteady flow field around a human hand and propulsive force in swimming. Journal of Biomechanics. 2009;42(1):42-47.
Matsuuchi, K., Miwa, T., Nomura, T., Sakakibara, J., Shintani, H., & Ungerechts, B. (2009). Unsteady flow field around a human hand and propulsive force in swimming. Journal of Biomechanics, 42(1), 42-47. https://doi.org/10.1016/j.jbiomech.2008.10.009
Matsuuchi, K., Miwa, T., Nomura, T., Sakakibara, J., Shintani, H., and Ungerechts, Bodo. 2009. “Unsteady flow field around a human hand and propulsive force in swimming”. Journal of Biomechanics 42 (1): 42-47.
Matsuuchi, K., Miwa, T., Nomura, T., Sakakibara, J., Shintani, H., and Ungerechts, B. (2009). Unsteady flow field around a human hand and propulsive force in swimming. Journal of Biomechanics 42, 42-47.
Matsuuchi, K., et al., 2009. Unsteady flow field around a human hand and propulsive force in swimming. Journal of Biomechanics, 42(1), p 42-47.
K. Matsuuchi, et al., “Unsteady flow field around a human hand and propulsive force in swimming”, Journal of Biomechanics, vol. 42, 2009, pp. 42-47.
Matsuuchi, K., Miwa, T., Nomura, T., Sakakibara, J., Shintani, H., Ungerechts, B.: Unsteady flow field around a human hand and propulsive force in swimming. Journal of Biomechanics. 42, 42-47 (2009).
Matsuuchi, K., Miwa, T., Nomura, T., Sakakibara, J., Shintani, H., and Ungerechts, Bodo. “Unsteady flow field around a human hand and propulsive force in swimming”. Journal of Biomechanics 42.1 (2009): 42-47.

16 Zitationen in Europe PMC

Daten bereitgestellt von Europe PubMed Central.

Comparative study between fully tethered and free swimming at different paces of swimming in front crawl.
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