Fluid-structure interaction and vortex identification

0386882 - MÚ 2013 RIV AU eng C - Konferenční příspěvek (zahraniční konf.)
Šístek, Jakub - Kolář, Václav - Cirak, F. - Moses, P.
Fluid-structure interaction and vortex identification.
Proceedings of the 18^th Australasian mechanics conference. Australia: Australian fluid mechanics society, 2012 - (Brandner, P.; Pearce, B.), s. 125. ISBN 978-0-646-58373-0.
[Australasian Fluid Mechanics Conference /18./. Launceston (AU), 03.12.2012-07.12.2012]
Grant CEP: GA AV ČR IAA200600801
Institucionální podpora: RVO:67985840 ; RVO:67985874
Klíčová slova: triple decomposition method * TDM * vortex identification
Kód oboru RIV: BA - Obecná matematika; BK - Mechanika tekutin (UH-J)

Fluid-structure interaction is often associated with 3D large-scale vortical structures in the wake and a near-wake region which is strongly affected by the mean-flow shear. The present paper concentrates on the performance of vortex-identification schemes in the near-wake region of an inclined flat plate. Two widely used methods, the Q-criterion and λ2-criterion, are compared with the triple-decomposition method (TDM) based on the extraction of a local shearing motion near a point. The following conclusion is drawn: to capture the vortical structures in the wake, both the Q-criterion and λ2-criterion cannot—unlike TDM—avoid the bias in showing shearing zones, formed in the close proximity of the plate edges, as vortex regions.
Trvalý link: http://hdl.handle.net/11104/0216442