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Brazilian Archives of Biology and Technology

Print version ISSN 1516-8913

Abstract

MANTHA, Vishveshwar Rajendra; MARINHO, Daniel Almeida; SILVA, Antonio Jose  and  ROUBOA, Abel Ilah. The 3D CFD study of gliding swimmer on passive hydrodynamics drag. Braz. arch. biol. technol. [online]. 2014, vol.57, n.2, pp.302-308. ISSN 1516-8913.  http://dx.doi.org/10.1590/S1516-89132014000200020.

The aim of this study was to analyze the effect of depth on the hydrodynamic drag coefficient during the passive underwater gliding after the starts and turns. The swimmer hydrodynamics performance was studied by the application of computational fluid dynamics (CFD) method. The steady-state CFD simulations were performed by the application of k - omega turbulent model and volume of fluid method to obtain two-phase flow around a three-dimensional swimmer model when gliding near water surface and at different depths from the water surface. The simulations were conducted for four different swimming pool size, each with different depth, i.e., 1.0, 1.5, 2.0 and 3.0 m for three different velocities, i.e., 1.5, 2.0 and 2.5 m/s, with swimmer gliding at different depths with intervals of 0.25 m, each starting from the water surface, respectively. The numerical results of pressure drag and total coefficients at individual average race velocities were obtained. The results showed that the drag coefficient decreased as depth increased, with a trend toward reduced fluctuation after 0.5m depth from the water surface. The selection of the appropriate depth during the gliding phase should be a main concern of swimmers and coaches.

Keywords : Computational Fluid Dynamics (CFD); Passive Drag; Starts; Turns; Streamline Gliding Position; Glide depth.

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