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- HANIU Toshihiro
- Graduate School of Engineering & Resource Science, Akita University
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- HASEGAWA Hiroaki
- Graduate School of Engineering & Resource Science, Akita University
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- NAKAGAWA Kenichi
- Graduate School of Engineering & Resource Science, Akita University
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抄録
Flying and aquatic animals release a vortex by pitching a wing or a fin. The behavior of this vortex affects unsteady fluid forces, and the propulsive force of these animals relates to unsteady forces accompanied with the movement of vortices. It is well known that vortex motion plays an important role in the generation of unsteady fluid force and enhancement of the force. In general, the force associated with unsteady flow is greater than that of steady flow. Accordingly, conventional quasi-steady theory cannot give the correct assessment of the generating mechanism of the propulsive force. In the present study, generation of the propulsive force in swimming is investigated. The vortex structure and its behavior owing to flow around a discoid airfoil simulating a swimmer's hand are investigated during pitch-oscillating motion. In particular, wind tunnel tests were conducted to investigate the relationship between three-dimensional vortex structure and unsteady fluid forces acting on a discoid airfoil. The vortical flow fields were measured using a scanning particle image velocimetry technique. Under stationary conditions, the vortex ring is successively shed downstream, and the vortex ring inclines as the angle of attack α of the airfoil changes. On the contrary, vortex growth is observed during pitch-oscillating motion, and a large scale vortex is released into the wake close to the airfoil.
収録刊行物
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- 実験力学
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実験力学 14 (Special_Issue), s71-s75, 2014
日本実験力学会
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詳細情報 詳細情報について
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- CRID
- 1390001205187912960
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- NII論文ID
- 130004687841
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- NII書誌ID
- AA11822914
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- ISSN
- 18844219
- 13464930
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- NDL書誌ID
- 025755634
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可