Vortical structures: Some aspects of the recent identification schemes

0447574 - ÚH 2016 BR eng C - Conference Paper (international conference)
Kolář, Václav - Šístek, Jakub
Vortical structures: Some aspects of the recent identification schemes.
COBEM2015 23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro: ABCM, 2015.
[23rd ABCM International Congress of Mechanical Engineering. Rio de Janeiro (BR), 06.12.2015-11.12.2015]
R&D Projects: GA ČR GA14-02067S
Institutional support: RVO:67985874 ; RVO:67985840
Keywords : vortical structures * vortex identification * vortex-identification schemes * decomposition of motion * corotation
Subject RIV: BK - Fluid Dynamics; BA - General Mathematics (MU-W)

The contribution deals with the recent vortex-identification schemes (proposed by the present authors) compared on the background of some widely used methods from the literature. It concentrates on their physical and kinematic aspects and presents some comparison results based on a straightforward application of these schemes to the 3-D outcome of numerical simulation (including a transonic flow past a turbine cascade and a flow around an impulsively started flat plate). The main aspects of vortex identification discussed are: the local corotation of line segments near a point, vorticity decomposition and the so-called residual vorticity, the effect of shear, the role of the axial-stretching rate, pressure aspects, applicability of identification schemes to compressible flows, the need for a local vortex intensity with an easy kinematic interpretation and linear
Permanent Link: http://hdl.handle.net/11104/0257478