Numerical study of transient aerodynamic forces acting on a ski jumper considering dynamic posture change from takeoff to landing
Numerical study of transient aerodynamic forces acting on a ski jumper considering dynamic posture change from takeoff to landing
复制标题
考虑起飞到着陆动态姿态变化的跳台滑雪运动员瞬态气动力数值研究
DOI：
10.1080/14763141.2022.2154256
复制
发表时间：
2022
影响因子：
2.2
通讯作者：
Tsubokura Makoto
中科院分区：
文献类型：
--
作者：
Yamamoto Keizo;Nishino Takahiro;Bale Rahul;Shimada Tokimasa;Miyamoto Naoto;Tsubokura Makoto
本研究的目的是开发一个计算流体动力学（CFD）方法的非定常分析的一系列滑雪跳跃动作的姿态变化，并分析在整个滑雪跳跃运动的空气动力学特性的专家跳跃。两名跳台滑雪运动员参加了这项研究。一个基于传感器的动捕服被用来捕捉跳跃者的姿势在实际的滑雪跳跃。通过叠加从运动员的3D形状的运动测量获得的关节角度来创建三维计算机图形动画。然后使用CFD计算了从起飞到着陆作用在跳台滑雪运动员上的非定常气动力。计算区域的入流边界条件为时变空间均匀流。结果表明，在起跳初期，当起跳者的姿态发生剧烈变化时，起跳者的升力和阻力都迅速增加。此后，阻力显著减小，但升力的减小不那么剧烈。在飞行阶段的后期，作用在专家跳跃者身上的升力增加，并且在整个飞行阶段，专家跳跃者的升阻比保持高于不熟练的跳跃者。
This study was designed to develop a computational fluid dynamics (CFD) method for unsteady analysis of a series of ski jump movements with attitude changes, and to analyse the aerodynamic characteristics of an expert jumper over the entire ski jump movement. Two ski jumpers participated in this study. A sensor-based motion capture suit was used to capture the jumper’s posture during the actual ski jump. A three-dimensional computer graphics animation was created by superimposing the joint angles obtained from the motion measurements of the 3D shape of the athlete. The unsteady aerodynamic forces acting on the ski jumper, from the takeoff to the landing, were then calculated using CFD. A time-varying spatially uniform flow was specified as the inflow boundary condition of the computational domain. The results indicated that both the lift and drag forces of the expert jumper increase rapidly during the initial flight when the jumper’s posture changes drastically. Thereafter, drag force decreased considerably, but the decrease in the lift force was less drastic. Later in the flight phase, the lift force acting on the expert jumper increased, and throughout the flight phase, the lift-drag ratio of the expert jumper remained higher than that of the unskilled jumper.