experimental investigation on the negative Magnus force

• Project/Area Number: 25870065
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Fluid engineering; Sports science
• Research Institution: Tohoku University
• Principal Investigator: KONISHI Yasufumi 東北大学, 流体科学研究所, 研究支援者 (20552540)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000); Fiscal Year 2015: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2014: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 球 / マグヌス力 / 卓球 / 球技

Outline of Final Research Achievements

The Magnus force plays important role in the ball games. There are some reports that this Magnus force tends to become opposite at some Reynolds number. It is called negative Magnus force. To identify the mechanism of this phenomenon, wind tunnel test and flying test was conducted. The region of negative Magnus force is clarified through the wind tunnel test using a table tennis ball. And also it is observed that the negative Magnus force does not appear in the actual flying table tennis ball under the condition of where it appeared on the wind tunnel test. It seems that the deceleration affects the transition phenomena.

Research Products

• [Presentation] PIV MEASURMENT OF FLYING TABLE TENNIS BALL (2016)
  • Author(s): Yasufumi Konishi, Hiroyuki Okuizumi, Tomoyuki Ohno
  • Organizer: International Sports Engineering Association 2016
  • Place of Presentation: Delft, the Netherlands
  • Year and Date: 2016-07-11
  • Int'l Joint Research
• [Presentation] 飛翔中の卓球ボール周りの PIV (2015)
  • Author(s): 小西康郁，奥泉寛之，大野智之
  • Organizer: シンポジウム： スポーツ工学・ヒューマンダイナミクス 2015
  • Place of Presentation: 滋賀県草津市， 立命館大学びわこ・くさつキャンパス
  • Year and Date: 2015-10-31
• [Presentation] 卓球ボールの空力特性の風洞試験と飛翔試験との比較 (2014)
  • Author(s): 小西 康郁，奥泉 寛之，大野 智之
  • Organizer: スポーツ・アンド・ヒューマン・ダイナミクス2014
  • Place of Presentation: 新潟県長岡市，アオーレ長岡
  • Year and Date: 2014-10-23
• [Presentation] PIV measurement of the rotating sphere under the condition of a negative Magnus force (2014)
  • Author(s): Yasufumi Konishi, Hiroyuki Okuizumi, Tomoyuki Ohno
  • Organizer: The 16th International Symposium on Flow Visualization
  • Place of Presentation: Okinawa, Japan
  • Year and Date: 2014-06-26
• [Presentation] 卓球ボールにおける負のマグヌス力の測定
  • Author(s): 小西 康郁，奥泉寛之，大野智之，大林茂
  • Organizer: スポーツアンドヒューマンダイナミクス2013
  • Place of Presentation: 工学院大学 新宿キャンパス
• [Presentation] 回転三次元角柱の空力計測
  • Author(s): 奥泉寛之，小西康郁，太田福雄，大林茂
  • Organizer: 機械学会東北支部第49期秋季講演会
  • Place of Presentation: 岩手大学工学部