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Effect of flapping frequency on aerodynamics of wing in freely hovering flight
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
2015 (English)In: Computers & Fluids, ISSN 0045-7930, E-ISSN 1879-0747, Vol. 117, 79-87 p.Article in journal (Refereed) Published
Abstract [en]

The two-dimensional incompressible Navier-Stokes equations are solved using the immersed boundary method. The wing is driven to translate in the horizontal direction and rotate periodically to emulate the wing motion of a fruit fly in normal hovering flight, while the motion in the vertical direction responds passively to the action of the wing aerodynamic lift and weight of the insect body. The insect body is modeled by a point mass. It is shown that flapping wing cannot produce required lift to maintain stable hovering flight in specified range with low flapping frequencies, if the insect weight is equivalent to the averaged wing lift in one cycle on the assumption of zero vertical velocity. The vertical velocity influences the instantaneous angle of attack of the hovering wing, which results in the variation in aerodynamics of the wing. The insect may experience fluctuating hovering flight with a reduced weight when the flapping frequency is low. The fluctuating amplitude decreases with increasing flapping frequency. The efficiency of hovering flight is also a problem of concern.

Place, publisher, year, edition, pages
2015. Vol. 117, 79-87 p.
Keyword [en]
Biological fluid dynamics, Fluid-structure interactions, Immersed boundary method, Swimming/flying
National Category
Vehicle Engineering
URN: urn:nbn:se:kth:diva-170195DOI: 10.1016/j.compfluid.2015.05.004ISI: 000358269500008ScopusID: 2-s2.0-84929624570OAI: diva2:828221

QC 20150630

Available from: 2015-06-30 Created: 2015-06-29 Last updated: 2015-08-14Bibliographically approved

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Du, Lin
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Marcus Wallenberg Laboratory MWLCompetence Center for Gas Exchange (CCGEx)
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