2010 Fiscal Year Final Research Report
A fundamental and applied study on fluid science and engineering for sports
| Project/Area Number |
20300207
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | University of Tsukuba |
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Principal Investigator |
ASAI Takeshi University of Tsukuba, 大学院・人間総合科学研究科, 教授 (00167868)
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| Co-Investigator(Kenkyū-buntansha) |
SEO Kazuya 山形大学, 地域教育文化学部, 准教授 (60292405)
HUJII Norihisa 筑波大学, 大学院・人間総合科学研究科, 准教授 (10261786)
TAKAGI Hideki 筑波大学, 大学院・人間総合科学研究科, 准教授 (80226753)
KOIKE Sekiya 筑波大学, 大学院・人間総合科学研究科, 准教授 (50272670)
HUJISAWA Nobuyuki 新潟大学, 工学部, 教授 (20165369)
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| Project Period (FY) |
2008 – 2010
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| Keywords | 流体 / ボール / 空力 / 抵抗 |
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| Research Abstract |
In this study, to analyze the knuckling effect of a soccer ball in actual flight, the characteristics of the unsteady wake structure were experimentally investigated by using high-speed video images and a smoke-generating agent. The experimental data indicate that the frequency of fluctuation of lift and side forces and the frequency of wake oscillation are closely related to each other with a statistically high correlation (r=0.94, p<0.01). From these results, the present study concludes that the phenomenon of large-scale vortex undulation in the wake is caused by the unsteady characteristics of the lift and side forces acting on a knuckleball, which might be related with the extraordinary instability in the separation of boundary layers.
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Research Products
(24 results)
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[Journal Article] Simulation of the trajectory of a punted rugby ball taking into account the asymmetrical pressure distribution caused by the seams2010
Author(s)
Seo, K., Kobayashi, O., Murakami, M., Yorita, D., Nagai H., Asai K.
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Journal Title
Journal of Visualization(Springer Berlin) Volume 13, Number 2
Pages: 97-105
Peer Reviewed
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[Journal Article] Vortex visualization of a low spinning soccer ball, The Impact of Technology on Sports III2009
Author(s)
浅井武
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Journal Title
Proceedings of the 4^<th> Asia Pacific Congress on Sports Technology (Alam L., Smith, L.V., Subic, A., Fuss, F.K., Ujihashi, S., eds.) Honolulu, RMIT, Australia
Pages: 195-199
Peer Reviewed
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[Journal Article] Soccer ball flight dynamics experiment using kicking machine, The Impact of Technology on Sports III2009
Author(s)
Suda, S., Asai T., Kondoh, M., Murakami, M., Ito, S.
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Journal Title
Proceedings of the 4^<th> Asia Pacific Congress on Sports Technology (Alam L., Smith, L.V., Subic, A., Fuss, F.K., Ujihashi, S., eds.) Honolulu, RMIT, Australia
Pages: 185-189
Peer Reviewed
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[Presentation] Aerodynamics of a New Volleyball2010
Author(s)
Asai, T., Ito, S., Seo, K., Hitotsubashi A.
Organizer
Procedia Engineering, 8th Conference of the International Sports Engineering Association.
Place of Presentation
ウィーン,オーストリア
Year and Date
2010-07-15
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[Presentation] Multi-Objective Exploration of the Launch Condition for a Fluctuating Punted Kick in Rugby on the basis of PSP Measurement2010
Author(s)
Seo, K., Yorita, D., Shimoyama, K., Nagai H., Asai, K
Organizer
Procedia Engineering, 8th Conference of the International Sports Engineering Association.
Place of Presentation
ウィーン,オーストリア
Year and Date
2010-07-15
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[Remarks] ホームページ等
