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Lagrange identification of absolutely unstable regimes in wake

Delfs, J. and Ehrhard, J. and Meiburg, E. and Oertel, H. (1997) Lagrange identification of absolutely unstable regimes in wake. Acta Mechanica, 122, pp. 89-97.

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Abstract

A novel approach to identify the absolute and convective character of instabilities is presented. The employed vortex blob method is found to be well suited to reproduce the dynamics of unstable wavepackets. The prediction of the classical local, linear stability analysis, according to which the wavepacket in an absolutely unstable flow contains upstream travelling modes, was confirmed accurately by the simulations. The non-linearity of the employed method enable the tracking of the disturbance waves up into the highly non-linear regime. The analysis is for a parallel shear flow but it is easily extended to non-parallel flows as well. The method may be combined with a vorticity generation mechanism to model the no-slip boundary condition and therefore to simulate flows past body-surfaces.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1997,
Title:Lagrange identification of absolutely unstable regimes in wake
Authors:
AuthorsInstitution or Email of Authors
Delfs, J.UNSPECIFIED
Ehrhard, J.UNSPECIFIED
Meiburg, E.UNSPECIFIED
Oertel, H.UNSPECIFIED
Date:1997
Journal or Publication Title:Acta Mechanica
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:122
Page Range:pp. 89-97
Status:Published
Keywords:linear wave packets, non-linear wave packets, vortex dynamics method, absolutely unstable wake, particle strength exchange .....
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L ST - Starrflüglertechnologien
DLR - Research theme (Project):L - Concepts & Integration
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:06

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