Effects of athlete's posture on the aerodynamic characteristics during flight in ski jumping
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1.China Institute of Sport Science;2.School of Kinesiology,Shanghai University of Sport

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G804.6

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    Abstract:

    Objective To determine the effects of athlete's posture on the aerodynamic characteristics during flight in ski jumping, including bending angle of upper body and angle between body and skis. Methods The athlete and skis were regarded as a multi-body system. By using partially averaged Navier-Stokes (PANS) turbulence model and numerical simulation of computational fluid dynamics (CFD), the aerodynamic characteristics during flight under different athlete's postures were predicted. The calculation conditions of bending angle of upper body include 10°, 14°, 18°, 22° and 26°, and the calculation conditions of angle between body and skis include 8°, 12°, 16°, 20° and 24°. Results 1) As the bending angle of upper body increases, the lift and drag of the multi-body system, the athlete and skis, and the pitch moment of skis all show a monotonously decreasing trend., but the total ratio of lift and drag increases first and then decreases. Meanwhile, the pitch moment value of the multi-body system decreases first and then increases, and the pitch moment value of athlete increases slightly and then decreases. 2) As the angle between body and skis increases, the lift and drag of the multi-body system and skis increase first, then decrease and then increase, but the total ratio of lift and drag decreases first, then increases and then decreases.. Meanwhile, the lift, drag and pitching moment of the athlete increase monotonously, and the values of the pitching moment of the multi-body system and the skis increase first and then decrease. Conclusions 1) The bending angle of upper body and the angle between body and skis have a certain influence on the aerodynamic characteristics during flight in ski jumping. In contrast, the effect of bending angle of upper body is generally significantly higher than that of angle between body and skis. 2) From the point of view of finding the relative optimal total lift-resistance ratio and flight stability, the optimal range of bending angle of upper body is 14°~18°, and the optimal range of angle between body and skis is 16°~20°. 3) The influence mechanism of bending angle of upper body and angle between body and skis on the aerodynamic characteristics during flight in ski jumping can provide effective auxiliary support for on-the-spot prediction and decision-making, and also provide scientific guidance for flight stability control and technical training for athletes.

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History
  • Received:June 01,2020
  • Revised:June 16,2020
  • Adopted:June 17,2020
  • Online:
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