Browsing by Author "Mantha, Vishveshwar"
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- Computational fluid dynamics: the analysis of drag coefficient during the gliding phasePublication . Marinho, D.A.; Ramos, Rui J.; Mantha, Vishveshwar; Barbosa, Tiago M.; Rouboa, Abel; Silva, A.J.The aim of the current study was to analyse the effect of depth on hydrodynamic drag coefficient during the underwater gliding, using computational fluid dynamics.
- Dinâmica computacional de fluidos: análise do coeficiente de arrasto durante o deslize subaquáticoPublication . Ramos, Rui J.; Marinho, D.A.; Mantha, Vishveshwar; Barbosa, Tiago M.; Rouboa, Abel; Ribeiro, João; Machado, Leandro; Vilas-Boas, João Paulo; Silva, A.J.O objectivo deste estudo foi analisar o efeito da profundidade no arrasto hidrodinâmico durante o deslize subaquático, utilizando a dinâmica computacional de fluidos.
- Modelling propelling force in swimming using numerical simulationsPublication . Marinho, D.A.; Barbosa, Tiago M.; Mantha, Vishveshwar; Rouboa, Abel; 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 methodology has been applied in order to better understand swimming performance. Thus, the numerical techniques have been addressed to study the propulsive forces generated by the propelling segments (Rouboa et al., 2006; Marinho et al., 2009a) and the hydrodynamic drag forces resisting forward motion (Silva et al., 2008; Marinho et al., 2009b). Although the swimmer’s performance is dependent on both drag and propulsive forces, within this chapter the focus is only on the analysis of the propulsive forces. Hence, this chapter covers topics in swimming propelling force analysis from a numerical simulation technique perspective. This perspective means emphasis on the fluid mechanics and computational fluid dynamics methodology applied in swimming investigations. One of the main aims for performance (velocity) enhancement of swimming is to maximize propelling forces whilst not increasing drag forces resisting forward motion, for a given trust. This chapter will concentrate on numerical simulation results, considering the scientific simulation point-of-view, for this practical application in swimming.
- The effect of wearing a cap on the swimmers passive dragPublication . Marinho, D.A.; Mantha, Vishveshwar; Rouboa, Abel; Vilas-Boas, João Paulo; Machado, Leandro; Barbosa, Tiago M.; Silva, A.J.
- The effect of wearing a cap on the swimmers passive dragPublication . Marinho, D.A.; Mantha, Vishveshwar; Rouboa, Abel; Vilas-Boas, João Paulo; Machado, Leandro; Barbosa, Tiago M.; Silva, A.J.
- The effect on swimmer’s hydrodynamic drag wearing two swimsuitsPublication . Marinho, D.A.; Mantha, Vishveshwar; Ramos, Rui J.; Barbosa, Tiago M.; Vilas-Boas, João Paulo; Rouboa, Abel; Silva, A.J.
- The gliding phase in swimming: the effect of water depthPublication . Marinho, D.A.; Barbosa, Tiago M.; Mantripragada, Narendra; Vilas-Boas, João Paulo; Rouard, A.H.; Mantha, Vishveshwar; Rouboa, Abel; Silva, A.J.Aiming to achieve higher performances, swimmers should maximize each component of swimming races. During starts and turns, the gliding phase represents a determinant part of these race components. Thus, the depth position allowing minimizing the hydrodynamic drag force represents an important concern in swimming research. The aim of this study was to analyse the effect of depth on drag during the underwater gliding, using computational fluid dynamics
- The gliding phase in swimming: the effect of water depthPublication . Marinho, D.A.; Barbosa, Tiago M.; Mantripragada, Narendra; Vilas-Boas, João Paulo; Rouard, A.H.; Mantha, Vishveshwar; Rouboa, Abel; Silva, A.J.The aim of this study was to analyse the effect of depth on drag during the underwater gliding. CFD simulations were applied to the flow around a 3D model of a male adult swimmer in a prone gliding position with the arms extended at the front. The domain to perform the simulations was created with 3.0 m depth, 3.0 m width and 11.0 m length. The drag coefficient and the hydrodynamic drag force were computed, using a steady flow velocity of 2.50 m/s for depths of 0.20, 0.50, 1.0, 1.50, 2.01 2.50 and 2.80 m. As the depth increased, the drag coefficient and drag force decreased. The water depth seems to have a positive effect on reducing hydrodynamic drag during the gliding after starts and turns, although a compromise between decreasing drag (by increasing water depth) and gliding travel distance should be a main concern of swimmers.