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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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.
|Title:||Lagrange identification of absolutely unstable regimes in wake|
|Journal or Publication Title:||Acta Mechanica|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 89-97|
|Keywords:||linear wave packets, non-linear wave packets, vortex dynamics method, absolutely unstable wake, particle strength exchange .....|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L - no assignement|
|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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