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Large eddy simulation of a pulsed jet in cross-flow

Published online by Cambridge University Press:  07 February 2012

Axel Coussement ,
O. Gicquel  and
G. Degrez
Axel Coussement*
Affiliation:
Aero-Thermo-Mechanics Department, Université Libre de Bruxelles, Avenue F. D. Roosevelt 51, CP 165/41, 1050 Bruxelles, Belgium Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry, France CNRS, UPR 288, ‘Laboratoire d’Énergétique Moléculaire et Macroscopique, Combustion’, Grande Voie des Vignes, 92295 Chatenay-Malabry, France
O. Gicquel
Affiliation:
Ecole Centrale Paris, Grande Voie des Vignes, 92295 Chatenay-Malabry, France CNRS, UPR 288, ‘Laboratoire d’Énergétique Moléculaire et Macroscopique, Combustion’, Grande Voie des Vignes, 92295 Chatenay-Malabry, France
G. Degrez
Affiliation:
Aero-Thermo-Mechanics Department, Université Libre de Bruxelles, Avenue F. D. Roosevelt 51, CP 165/41, 1050 Bruxelles, Belgium
*
†Email address for correspondence: axcousse@ulb.ac.be
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Abstract

This study quantifies the mixing that results from a pulsed jet in cross-flow in the near jet region. By large eddy simulation computations, it also helps to understand the physical phenomena involved in the formation of the pulsed jet in cross-flow. The boundary conditions of the jet inlet are implemented via a Navier–Stokes characteristic boundary condition coupled with a Fourier series development. The signals used to pulse the jet inlet are a square or a sine wave. A new way of characterizing the mixing is introduced with the goal of easily interpreting and quantifying the complicated mixing process involved in a pulsed jet in cross-flow flow fields. Different flow configurations, pulsed and non-pulsed, are computed and compared, keeping the root mean square value of the signal constant. This comparison not only allows the characterization of the mixing but also illustrates some of the properties of the mixing characterization.

JFM classification

Wakes/Jets: Jets Mixing: Mixing Turbulent Flows: Turbulence simulation
Type
Papers
Information
Journal of Fluid Mechanics , Volume 695 , 25 March 2012 , pp. 1 - 34
Copyright
Copyright © Cambridge University Press 2012

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