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Experimental and Numerical Analysis of the Three-Dimensional Evolution of an Axisymmetric Jet

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Turbulent Shear Flows 7

Abstract

We study the three-dimensional evolution of a transitional axisymmetric jet subjected to periodic perturbations both in the streamwise and in the circumferential direction. The combined analysis of flow visualization experiments and inviscid vortex dynamics simulations provides a detailed picture of the processes leading to the concentration, reorientation, and stretching of the vorticity. A single perturbation in the streamwise direction leads to the formation of vortex rings, while a free stagnation point forms in the downstream half of the braid region between successive vortices. If we also introduce a subharmonic perturbation in the streamwise direction, neighboring vortices proceed towards a pairing process. In addition, it is shown that when the jet is also subjected to a sinusoidal perturbation in the azimuthal direction, counterrotating pairs of streamwise vortex tubes are formed in the braid regions, and the cores of the vortex rings develop a wavy dislocation. We discuss the importance of global and local induction for the evolution and interaction of these three-dimensional instability modes.

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Authors and Affiliations

  1. Center for Fluid Mechanics, Division of Applied Mathematics, Brown University, Providence, RI, 02912, USA

    Eckart Meiburg & James E. Martin

  2. Department of Mechanical Engineering, University of Southern California, Los Angeles, CA, 90089-1453, USA

    Juan C. Lasheras

Authors
  1. Eckart Meiburg
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  2. Juan C. Lasheras
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  3. James E. Martin
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Editor information

Editors and Affiliations

  1. Lehrstuhl für Strömungsmechanik, Universität Erlangen-Nürnberg, Cauerstraße 4, 8520, Erlangen, Germany

    Franz Durst

  2. Department of Mechanical Engineering, Institute of Science and Technology, University of Manchester, Manchester, M60 1QD, UK

    Brian E. Launder

  3. Mechanical Engineering Department, Thermosciences Division, Stanford University, Stanford, CA, 94305-3030, USA

    William C. Reynolds

  4. Mechanical Engineering Department, The Pennsylvania State University, University Park, PA, 16802, USA

    Frank W. Schmidt

  5. Department of Mechanical Engineering, Imperial College of Science and Technology, Exhibition Road, London, SW7 2BX, England

    James H. Whitelaw

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© 1991 Springer-Verlag Berlin Heidelberg

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Meiburg, E., Lasheras, J.C., Martin, J.E. (1991). Experimental and Numerical Analysis of the Three-Dimensional Evolution of an Axisymmetric Jet. In: Durst, F., Launder, B.E., Reynolds, W.C., Schmidt, F.W., Whitelaw, J.H. (eds) Turbulent Shear Flows 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-76087-7_15

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  • DOI: https://doi.org/10.1007/978-3-642-76087-7_15

  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-642-76089-1

  • Online ISBN: 978-3-642-76087-7

  • eBook Packages: Springer Book Archive

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