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Journal of Mechanical Science and Technology

, Volume 33, Issue 6, pp 2725–2735 | Cite as

Numerical investigation of the aerodynamic benefits of wing-wing interactions in a dragonfly-like flapping wing

  • A. R. Shanmugam
  • C. H. SohnEmail author
Article
  • 65 Downloads

Abstract

Numerical simulations are performed to investigate the aerodynamic benefits of wing-wing interactions on a dragonfly-like flapping wing while hovering, at a value of Reynolds number Re set to 630. The local phase shift ψ and wing spacing L* (L/c) are varied to observe their influence on aerodynamic performance. The results show that the aerodynamic benefits due to interactions are strongly dependent on both ψ and L*. The wing-wing interactions are beneficial for the in-phase stroking pattern at ψ = 0° when 1.2 ≤ L* ≤ 2.3, while it is extremely detrimental for the counter stroking pattern at ψ = 180° when 1.2 ≤ L* ≤ 2.3; these benefits and drawbacks are dependent on the timing of the interactions. The best case, when ψ = 0° and L* = 2.1, can increase the time-averaged vertical force coefficient \(\overline{C_v}\) up to ∼10 % in comparison to the without-interaction case. Two unsteady flow features namely the “enhanced dipole structure” and the “in-sync of wake capture and wing-wing interactions” are observed that increase the vertical force generation in hovering dragonflies. The overall downward momentum imparted by the wing is larger for ψ = 0° in comparison to ψ = 180° as the wake has high vertical velocities due to the constructive role played by wing-wing interactions.

Keywords

Dragonflies Flapping wing Insect flight Tandem Wing-wing interactions 

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Notes

Acknowledgments

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education [NRF-2017R1 D1A1B03032472].

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Copyright information

© KSME & Springer 2019

Authors and Affiliations

  1. 1.School of Mechanical EngineeringKyungpook National UniversityDaeguKorea

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