Encontrados 5 documentos, a visualizar página 1 de 1
Three-dimensional CFD analysis of the hand and forearm in swimming
Marinho, D.A.; Silva, A.J.; Reis, V.M.; Barbosa, Tiago M.; Vilas-Boas, J.P.; Alves, F.B.; Machado, L.; Rouboa, A.The purpose of this study was to analyze the hydrodynamic characteristics of a realistic model of an elite swimmer hand/forearm using three-dimensional computational fluid dynamics techniques. A three-dimensional domain was designed to simulate the fluid flow around a swimmer hand and forearm model in different orientations (0°, 45°, and 90° for the three axes Ox, Oy and Oz). The hand/forearm model was obtained...
Swimming propulsion forces are enhanced by a small finger spread
Marinho, D.A.; Barbosa, Tiago M.; Reis, V.M.; Kjendlie, P.L.; Alves, F.B.; Vilas-Boas, J.P.; Machado, L.; Silva, A.J.; Rouboa, A.The main aim of this study was to investigate the effect of finger spread on the propulsive force production in swimming using computational fluid dynamics. Computer tomography scans of an Olympic swimmer hand were conducted. This procedure involved three models of the hand with differing finger spreads: fingers closed together (no spread), fingers with a small (0.32 cm) spread, and fingers with large (0.64 cm)...
Modelling hydrodynamic drag in swimming using computational fluid dynamics
Marinho, D.A.; Barbosa, Tiago M.; Kjendlie, P.L.; Mantripragada, N.; Vilas-Boas, J.P.; Machado, L.; Alves, F.B.; Rouboa, A.; Silva, A.J.In the sports field, numerical simulation techniques have been shown to provide useful information about performance and to play an important role as a complementary tool to physical experiments. Indeed, this methodology has produced significant improvements in equipment design and technique prescription in different sports (Kellar et al., 1999; Pallis et al., 2000; Dabnichki & Avital, 2006). In swimming, this ...
The determination of drag in the gliding phase in swimming
Marinho, D.A.; Carvalho, Filipe; Barbosa, Tiago M.; Reis, V.M.; Alves, F.B.The hydrodynamic drag forces produced by the swimmer during the sub aquatic gliding have been analyzed appealing to experimental investigation methods (e.g., Lyttle et al., 2000). However, the obtained results varied, which can translate some of the main inherent difficulties involved in the experimental studies. Thus, through application of a numerical method of Computational Fluid Dynamics (CFD), we intended ...
Swimming simulation: a new tool for swimming research and practical applications
Marinho, D.A.; Barbosa, Tiago M.; Kjendlie, P.L.; Vilas-Boas, J.P.; Alves, F.B.; Rouboa, A.; Silva, A.J.Swimming is one of the major athletic sports and many efforts are being made to establish new records in all events. To swim faster, thrust should be maximized and drag should be minimized. These aims are difficult to achieve because swimmers surge, heave, roll and pitch during every stroke cycle. In addition, measurements of human forces and mechanical power are difficult due to the restrictions of measuring d...
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