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タイトル
  • en Effect of wing mass in free flight of a two-dimensional symmetric flapping wing-body model
作成者
    • Suzuki, Kosuke
    • Aoki, Takaaki
    • Yoshino, Masato
権利情報
  • This is the Accepted Manuscript version of an article accepted for publication in FLUID DYNAMICS RESEARCH. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1873-7005/aa7a9a.© 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
主題
  • Other flapping flight
  • Other wing mass
  • Other lattice Boltzmann method
  • Other immersed boundary method
内容注記
  • Abstract The effect of wing mass in the free flight of a flapping wing is investigated by numerical simulations based on an immersed boundary-lattice Boltzmann method. We consider a model consisting of two-dimensional symmetric flapping wings with uniform mass density connected by a body represented as a point mass. We simulate free flights of the two-dimensional symmetric flapping wing with various mass ratios of the wings to the body. In free flights without gravity, it is found that the time-averaged lift force becomes smaller as the mass ratio increases, since with a large mass ratio the body experiences a large vertical oscillation in one period and consequently the wing-tip speed relatively decreases. We define the effective Reynolds number Reeff taking the body motion into consideration and investigate the critical value of Reeff over which the symmetry breaking of flows occurs. As a result, it is found that the critical value is Re-eff similar or equal to 70 independently of the mass ratio. In free flights with gravity, the time-averaged lift force becomes smaller as the mass ratio increases in the same way as free flights without gravity. In addition, the unstable rotational motion around the body is suppressed as the mass ratio increases, since with a large mass ratio the vortices shedding from the wing tip are small and easily decay.
  • Other Article
  • Other FLUID DYNAMICS RESEARCH.49(5):055504(2017)
出版者 IOP PUBLISHING LTD
日付
    Issued2017-08-11
言語
  • eng
資源タイプ journal article
出版タイプ AM
資源識別子 HDL http://hdl.handle.net/10091/00022526 , URI https://soar-ir.repo.nii.ac.jp/records/21769
関連
  • DOI https://doi.org/10.1088/1873-7005/aa7a9a 10.1088/1873-7005/aa7a9a
収録誌情報
    • ISSN 0169-5983
    • NCID AA10686129
      • FLUID DYNAMICS RESEARCH
      • 巻49 号5 開始ページ055504
ファイル
コンテンツ更新日時 2023-06-26