000015951 001__ 15951
000015951 005__ 20161115135334.0
000015951 04107 $$aeng
000015951 046__ $$k2013-06-12
000015951 100__ $$aGulCat, u.
000015951 24500 $$aFlapping Thin Airfoil Interacting With the Ground

000015951 24630 $$n34.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000015951 260__ $$bNational Technical University of Athens, 2013
000015951 506__ $$arestricted
000015951 520__ $$2eng$$aThe rotary wing and the flapping wing technology for the MAVs (Micro Air Vehicle) demand the studies of unsteady aerodynamic effects on the vehicles performing near the ground. In this study, a fast and robust numerical method based on the general formulae for the lift and propulsive forces, acting on a heaving-plunging airfoil, induced by a vortex sheet and its ground image, is developed and implemented. The Keldish-Lavrentiev series expansion of the Kernel function is employed to find the effect of the image vortex sheet on the airfoil. Coupled with the unsteady aerodynamics, the unsteady boundary layer equations cast in the velocity-vorticity formulation are solved numerically to predict the viscous drag on the airfoil performance under the: i) restrained condition where the mean distance to the ground remains the same, and ii) unrestrained condition for which the airfoil ascends or descends freely during its interaction with the ground. Applications of these two different performances with Reynolds number of 3040 and 10 000, which are examples from the current literature, yield satisfactory results.

000015951 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015951 653__ $$aGround Effect, Steady, Unsteady

000015951 7112_ $$aCOMPDYN 2013 - 4th International Thematic Conference$$cIsland of Kos (GR)$$d2013-06-12 / 2013-06-14$$gCOMPDYN2013
000015951 720__ $$aGulCat, u.
000015951 8560_ $$ffischerc@itam.cas.cz
000015951 8564_ $$s137709$$uhttps://invenio.itam.cas.cz/record/15951/files/2006.pdf$$yOriginal version of the author's contribution as presented on CD, section: SC-MS 10 SOME INTERACTION PROBLEMS IN COMPUTATIONAL MECHANICS
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000015951 962__ $$r15525
000015951 980__ $$aPAPER