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Dinâmica computacional de fluidos: análise do coeficiente de arrasto durante o deslize subaquático

Publication . 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.

2011Conference object

Open access

Análise dos Fatos utilizados no 13º Campeonato do Mundo FINA

Publication . Neiva, Henrique P.; Vilas-Boas, João Paulo; Barbosa, Tiago M.; Silva, A.J.; Marinho, D.A.

Para nadar mais rápido, é necessário aumentar a propulsão e diminuir o arrasto. Para o caso, os fatos de natação de poliuretano podem ter desempenhado um papel importante (Marinho et al., 2009). Com este estudo pretende-se descrever a distribuição dos diferentes modelos de fatos de natação usados pelos nadadores durante todas as finais do 13º Campeonato do Mundo de natação, realizado em Roma e assim perceber as preferências dos nadadores de elevado nível desportivo.

2011Conference object

Open access

The gliding phase in swimming: the effect of water depth

Publication . 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

2010Conference object

Open access

The gliding phase in swimming: the effect of water depth

Publication . 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.

2010Conference object

Open access

The effect on swimmer’s hydrodynamic drag wearing two swimsuits