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Computational Fluid Dynamics during takeoff motion in ski jumping

Research Project

Project/Area Number 24500750
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Sports science
Research InstitutionHokusho University

Principal Investigator

YAMAMOTO Keizo  北翔大学, 生涯スポーツ学部, 教授 (00405698)

Co-Investigator(Kenkyū-buntansha) MATSUZAWA Mamoru  北翔大学, 教育文化学部, 准教授 (20433469)
TSUBOKURA Makoto  神戸大学大学院, システム情報工学研究科, 教授 (40313366)
Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsスキージャンプ / テイクオフ / 数値流体解析 / テイクオフ動作
Outline of Final Research Achievements

The purpose of this study was to quantify the aerodynamic characteristics during takeoff movement in ski jumping using computational fluid dynamics (CFD). To validate the CFD method, the human dummy models for the wind tunnel test were made. The aerodynamic characteristics were measured in the wind tunnel test. The numerical simulations of two different movements were performed and quantified aerodynamic characteristics during the motion. There were big differences in the aerodynamic forces between the motions, and there was a difference of up to 2.2 times in the drag. In addition, it was in the latter half of the movement, and the lift of the technically high-level player was suddenly increased. The down stream was formed in a wake of the player; this down stream was created by the two symmetric vortexes coming from the upper extremities. This results suggested that influence on lift of the arms was relatively big, and the motion of the arms could not ignore aerodynamically.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (10 results)

All 2015 2013 2012

All Journal Article (4 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (6 results)

  • [Journal Article] Numerical simulation of airflow around a ski jumper during takeoff2015

    • Author(s)
      Keizo Yamamoto, Makoto Tsubokura, Keiji Onishi, Denis Vuillemin and Guanghao Wu
    • Journal Title

      Science and Skiing

      Volume: 6 Pages: 536-542

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Validity of a jump training apparatus using Wii Balance Board2012

    • Author(s)
      Keizo Yamamoto and Mamoru Matsuzawa
    • Journal Title

      Gait and Posture

      Volume: 38 Issue: 1 Pages: 132-135

    • DOI

      10.1016/j.gaitpost.2012.11.002

    • Related Report
      2012 Research-status Report
    • Peer Reviewed
  • [Journal Article] 北方圏生涯スポーツ研究センターにおけるスキー選手の体力測定結果2012

    • Author(s)
      竹田唯史、近藤雄一郎、山本敬三、吉田 真、吉田昌弘、山本敏美
    • Journal Title

      北翔大学北方圏生涯スポーツ研究センター年報

      Volume: 第3号 Pages: 29-34

    • NAID

      110009511162

    • Related Report
      2012 Research-status Report
  • [Journal Article] 2011年度スポルアカデミー実施報告2012

    • Author(s)
      吉田昌弘,山本敬三,吉田 真
    • Journal Title

      北翔大学北方圏生涯スポーツ研究センター年報

      Volume: 第3号 Pages: 51-54

    • NAID

      110009511200

    • Related Report
      2012 Research-status Report
  • [Presentation] Unsteady aerodynamics of a ski jumper during the takeoff motion2015

    • Author(s)
      Keizo Yamamoto, Makoto Tsubokura, Sophie Baleriola, Keiji Onishi
    • Organizer
      European College of Sport Science
    • Place of Presentation
      Sweden
    • Year and Date
      2015-06-24 – 2015-06-27
    • Related Report
      2014 Annual Research Report
  • [Presentation] Analysis of anterior cruciate ligament tensile force during drop vertical jump2015

    • Author(s)
      Yasuhito Inagawa, Keizo Yamamoto
    • Organizer
      World Confederation of Physical Therapy Congress 2015
    • Place of Presentation
      Singapore
    • Year and Date
      2015-05-01 – 2015-05-04
    • Related Report
      2014 Annual Research Report
  • [Presentation] Vibration frequency effects on trunk and hip joint alignment during prone bridge exercise with a sling2015

    • Author(s)
      Masaki Kotani, Keizo Yamamoto
    • Organizer
      World Confederation of Physical Therapy Congress 2015
    • Place of Presentation
      Singapore
    • Year and Date
      2015-05-01 – 2015-05-04
    • Related Report
      2014 Annual Research Report
  • [Presentation] スキージャンプ・テイクオフ動作における空力特性の計測2013

    • Author(s)
      山本敬三、坪倉 誠、呉 広鎬、杉本つばさ
    • Organizer
      日本体育学会第64回大会
    • Place of Presentation
      立命館大学 びわこ・くさつキャンパス
    • Related Report
      2013 Research-status Report
  • [Presentation] WIND TUNNEL MEASUREMENT OF AIRFLOW AROUND A SKI JUMPER DURING TAKOFF2013

    • Author(s)
      Keizo Yamamoto, Makoto Tsubokura, Keiji Onishi, Tsubasa Sugimoto and Kaoru Yamanobe
    • Organizer
      International Congress on Science and Skiing
    • Place of Presentation
      St. Anton, Austria
    • Related Report
      2013 Research-status Report
  • [Presentation] NUMERICAL SIMULATION OF AIRFLOW AROUND A SKI JUMPER DURING TAKOFF2013

    • Author(s)
      Makoto Tsubokura, Keizo Yamamoto, Keiji Onishi, Denis Vuillemin and Guanghao Wu
    • Organizer
      International Congress on Science and Skiing
    • Place of Presentation
      St. Anton, Austria
    • Related Report
      2013 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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