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Ground effect on tandem flapping wings hovering
Published in Elsevier Ltd
2017
Volume: 152
   
Pages: 40 - 56
Abstract
The ground effect on tandem wings hovering in an inclined stroke plane is studied using immersed boundary projection method by solving two-dimensional incompressible Navier-Stokes equations. A virtual tandem flapping wing model performing idealized sinusoidal kinematics is employed in the study. The computations are carried out at Re=100 in a quiescent fluid at different heights from the ground. The phase relationship between the forewing and hindwing and its effect on the aerodynamic coefficients at various inter-wing distances are studied. Flow induced by the vortices rebound from the ground changes the effective angle of attack of the wings and influences the force generation. Complex wing-wing and wing-vortex interactions are observed. In-phase stroking generates the maximum vertical force, but produces a wake with a swirl. Counter-stroking generates a wake with predominant vertical velocity and increases the stability of the body in hovering. © 2017 Elsevier Ltd
About the journal
JournalData powered by TypesetComputers and Fluids
PublisherData powered by TypesetElsevier Ltd
ISSN00457930
Open AccessNo
Concepts (15)
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    Aerodynamics
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    Angle of attack
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    Ground effect
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    Vortex flow
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    Wakes
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    Wings
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    Aerodynamic coefficients
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    DRAGONFLY
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    Incompressible navier stokes equations
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    PHASE RELATIONSHIPS
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    Projection method
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    Tandem wings
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    VERTICAL VELOCITY
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    Vortex interactions
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    Navier stokes equations