ヤマモト　ケイゾウ   Keizo Yamamoto
  山本　敬三
   所属   生涯スポーツ学部 スポーツ教育学科
   職種   教授
言語種別 英語
発行・発表の年月 2016
形態種別 学術論文
査読 査読あり
標題 Effect of posture on the aerodynamic characteristics during take-off in ski jumping.
執筆形態 共著
掲載誌名 Journal of Biomechanics
掲載区分国外
出版社・発行元 Elsevier
巻・号・頁 49,pp.3688-3696
担当範囲 研究の統括、動作分析
著者・共著者 Keizo Yamamoto, Makoto Tsubokura, Jun Ikeda, Keiji Onishi and Sophie Baleriola
概要 The purpose of this study was to investigate the effects of posture of a ski jumper on aerodynamic characteristics during the take-off using computational fluid dynamics. Based on video analysis of the actual take-off movement, two sets of motion data were generated (world-class jumper A and less-experienced jumper B). The aerodynamic force, flow velocity, and vortexes for each model were compared between models. Regarding the total lift force, although jumper A’s total lift force was less in the in-run posture, it became greater than that of jumper B at the end of the movement. There were two symmetric vortexes in the wake of jumper A, but the disordered vortexes were observed behind the jumper B. In the case of jumper A, these two distinct vortexes generated by the arms produced a downwash flow in the wake. It is considered that the positioning of the arms in a very low position strongly influences the flow structure.