Recent progress in explicit shear-eliminating vortex identification

0438532 - ÚH 2015 RIV AU eng C - Konferenční příspěvek (zahraniční konf.)
Kolář, Václav - Šístek, Jakub
Recent progress in explicit shear-eliminating vortex identification.
The Proceedings of the 19th Australasian Fluid Mechanics Conference. Melbourne: RMIT University, 2014 - (Chowdhury, H.; Alam, F.). ISBN 978-0-646-59695-2.
[19th Australasian Fluid Mechanics Conference. Melbourne (AU), 08.12.2014-11.12.2014]
Grant CEP: GA ČR GA14-02067S
Institucionální podpora: RVO:67985874 ; RVO:67985840
Klíčová slova: vortex identification * vortex-identification methods * Burgers vortices
Kód oboru RIV: BK - Mechanika tekutin; BA - Obecná matematika (MU-W)
http://people.eng.unimelb.edu.au/imarusic/proceedings/19/274.pdf

All the widely used pointwise vortex-identification schemes based on the velocity-gradient tensor ∇u (Q, λ₂, Δ, and λ_ci) implicitly suppress - unlike vorticity - the biasing effect of shear on their outcome. However, it is shown below that explicit sheareliminating vortex-identification methods are in this regard more efficient in regions of strong shear. The latter ones are represented by the triple-decomposition method (TDM) and by the very recently proposed average-corotation scheme; their results, not mutually compared earlier, are remarkably similar.
Trvalý link: http://hdl.handle.net/11104/0245468