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| Documento principal | 1.53 MB | Adobe PDF |
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Abstract(s)
O objectivo deste presente estudo passou por analisar o efeito da profundidade e da
velocidade de nado na variação da força de arrasto hidrodinâmico (D) e do coeficiente de
arrasto (CD), durante a fase de deslize subaquático passivo, após as partidas e viragens. Para
esta análise, foi utilizada a metodologia de Dinâmica Computacional de Fluidos, através do
software ANSYS® FLUENT®, tendo sido modelado um modelo tridimensional real de um
nadador de elite na posição hidrodinâmica fundamental. Este modelo foi obtido através de
uma tomografia axial computorizada (TAC) completa do corpo. As simulações foram
efectuadas para as profundidades de 0, 0.25, 0.50, 0.75 e 1.0 metros, com três velocidades
representativas diferentes, 1.5, 2.0 e 2.5 m/s. Os resultados obtidos revelaram que o arrasto
hidrodinâmico diminuiu à medida que a profundidade aumentou, havendo uma tendência para
a estabilização deste valor após os 0.75 m de profundidade. Contudo, a 0 m de profundidade,
o valor de arrasto hidrodinâmico é menor do que a 1 m de profundidade. Verificou-se também
que um aumento da velocidade levou a um aumento da força de arrasto e a uma diminuição
do coeficiente de arrasto hidrodinâmico. Estes dados parecem sugerir que a selecção da
profundidade adequada para a realização do deslize subaquático deve ser uma preocupação
central dos nadadores e treinadores.
The aim of this study was analyze the effect of depth and swimming speed variation of the hydrodynamic drag force (D) and the drag coefficient (CD), during the passive underwater slide after starts and turns. For this analysis, was used the methodology of Computational Fluid Dynamics, through the software ANSYS® FLUENT®, having been modeled a real three-dimensional model of an elite swimmer in the streamline position. This model was obtained through a computerized axial tomography of the full body. The simulations were conducted for depths of 0, 0.25, 0.50, 0.75 and 1.0 meters, with three different representing speeds, 1.5, 2.0 and 2.5 m/s. The results showed that the hydrodynamic drag decreased as depth increased, with a trend toward stabilization of this value after the 0.75 m deep. However, the 0 m depth, the vale of drag is less that 1 m deep. There was also an increase in speed led to an increased drag force and a decrease in hydrodynamic drag coefficient. These data seem to suggest that the selection of the appropriate depth for the realization of the gliding slide should be a central concern of the swimmers and coaches.
The aim of this study was analyze the effect of depth and swimming speed variation of the hydrodynamic drag force (D) and the drag coefficient (CD), during the passive underwater slide after starts and turns. For this analysis, was used the methodology of Computational Fluid Dynamics, through the software ANSYS® FLUENT®, having been modeled a real three-dimensional model of an elite swimmer in the streamline position. This model was obtained through a computerized axial tomography of the full body. The simulations were conducted for depths of 0, 0.25, 0.50, 0.75 and 1.0 meters, with three different representing speeds, 1.5, 2.0 and 2.5 m/s. The results showed that the hydrodynamic drag decreased as depth increased, with a trend toward stabilization of this value after the 0.75 m deep. However, the 0 m depth, the vale of drag is less that 1 m deep. There was also an increase in speed led to an increased drag force and a decrease in hydrodynamic drag coefficient. These data seem to suggest that the selection of the appropriate depth for the realization of the gliding slide should be a central concern of the swimmers and coaches.
Description
Keywords
Natação Natação - Arrasto hidrodinâmico Natação - Arrasto - Avaliação Natação - Deslize subaquático - Avaliação