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Journal of Human Kinetics

The Journal of Academy of Physical Education in Katowice

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1899-7562
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The Effect of Depth on Drag During the Streamlined Glide: A Three-Dimensional CFD Analysis

Maria Novais
  • Department of Sports, University of Trás-os-Montes and Alto Douro, Health and Exercise, UTAD, Vila Real. Portugal
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ António Silva
  • Department of Sports, University of Trás-os-Montes and Alto Douro, Health and Exercise, UTAD, Vila Real. Portugal
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
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  • De Gruyter OnlineGoogle Scholar
/ Vishveshwar Mantha
  • Department of Sports, University of Trás-os-Montes and Alto Douro, Health and Exercise, UTAD, Vila Real. Portugal
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
  • Other articles by this author:
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/ Rui Ramos
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
  • Department of Sport Sciences, University of Beira Interior, UBI, Covilhã Portugal
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/ Abel Rouboa
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
  • Department of Mechanical Engineering, University of Trás-os-Montes and Alto Douro, UTAD, Vila Real, Portugal
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/ J. Vilas-Boas
  • Faculty of Sport, University of Porto, FADEUP, Porto, Portugal
  • Porto Laboratory of Biomechanics, Porto, Portugal
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/ Sérgio Luís
  • Department of Sports, University of Trás-os-Montes and Alto Douro, Health and Exercise, UTAD, Vila Real. Portugal
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/ Daniel Marinho
  • Research Centre in Sports, Health and Human Development, CIDESD, Portugal
  • Department of Sport Sciences, University of Beira Interior, UBI, Covilhã Portugal
  • Other articles by this author:
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Published Online: 2012-07-04 | DOI: https://doi.org/10.2478/v10078-012-0044-2

The Effect of Depth on Drag During the Streamlined Glide: A Three-Dimensional CFD Analysis

The aim of this study was to analyze the effects of depth on drag during the streamlined glide in swimming using Computational Fluid Dynamics. The Computation Fluid Dynamic analysis consisted of using a three-dimensional mesh of cells that simulates the flow around the considered domain. We used the K-epsilon turbulent model implemented in the commercial code Fluent® and applied it to the flow around a three-dimensional model of an Olympic swimmer. The swimmer was modeled as if he were gliding underwater in a streamlined prone position, with hands overlapping, head between the extended arms, feet together and plantar flexed. Steady-state computational fluid dynamics analyses were performed using the Fluent® code and the drag coefficient and the drag force was calculated for velocities ranging from 1.5 to 2.5 m/s, in increments of 0.50m/s, which represents the velocity range used by club to elite level swimmers during the push-off and glide following a turn. The swimmer model middle line was placed at different water depths between 0 and 1.0 m underwater, in 0.25m increments. Hydrodynamic drag decreased with depth, although after 0.75m values remained almost constant. Water depth seems to have a positive effect on reducing hydrodynamic drag during the gliding. Although increasing depth position could contribute to decrease hydrodynamic drag, this reduction seems to be lower with depth, especially after 0.75 m depth, thus suggesting that possibly performing the underwater gliding more than 0.75 m depth could not be to the benefit of the swimmer.

Keywords: biomechanics; swimming; performance; simulations

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About the article


Published Online: 2012-07-04

Published in Print: 2012-06-01


Citation Information: Journal of Human Kinetics, ISSN (Online) 1899-7562, ISSN (Print) 1640-5544, DOI: https://doi.org/10.2478/v10078-012-0044-2.

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