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Effect of flapping frequency on aerodynamics of wing in freely hovering flight
KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, MWL Marcus Wallenberg Laboratoriet. KTH, Skolan för industriell teknik och management (ITM), Centra, Competence Center for Gas Exchange (CCGEx).
2015 (engelsk)Inngår i: Computers & Fluids, ISSN 0045-7930, E-ISSN 1879-0747, Vol. 117, s. 79-87Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2015. Vol. 117, s. 79-87
Emneord [en]
Biological fluid dynamics, Fluid-structure interactions, Immersed boundary method, Swimming/flying
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-170195DOI: 10.1016/j.compfluid.2015.05.004ISI: 000358269500008Scopus ID: 2-s2.0-84929624570OAI: oai:DiVA.org:kth-170195DiVA, id: diva2:828221
Merknad

QC 20150630

Tilgjengelig fra: 2015-06-30 Laget: 2015-06-29 Sist oppdatert: 2017-12-04bibliografisk kontrollert

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