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Optimal amplification of streamwise streaks in plane jets and their stabilizing effect on the inflectional instability

Del Guercio, Gerardo and Cossu, Carlo and Pujals, Grégory Optimal amplification of streamwise streaks in plane jets and their stabilizing effect on the inflectional instability. (2013) In: 14th European Turbulence Conference - ETC14, 1 September 2013 - 4 September 2013 (Lyon, France). (Unpublished)

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Abstract

Optimal transient energy growths supported by the plane Bickley jet are computed for a set of spanwise wavenumbers and Reynolds numbers. It is shown that the maximum energy amplification is proportional to the square of the Reynolds number. The computed optimal streamwise vortices are then used to efficiently force finite amplitude streaks that are shown to stabilize the jet's powerful inflectional instability, which is clearly relevant for a number of applications in the control of free shear flows.

Item Type:Conference or Workshop Item (UNSPECIFIED)
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > PSA Peugeot Citroën (FRANCE)
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Deposited On:28 Nov 2013 13:06

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