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Wave packets and Orr mechanism in turbulent jets

Gilles Tissot1,2,*, Francisco C. Lajús, Jr.2,3, André V. G. Cavalieri2, and Peter Jordan4

  • 1Institut de Mathématiques de Toulouse, Université Paul Sabatier, 31062 Toulouse, France
  • 2Divisão de Engenharia Aeronáutica, Instituto Tecnológico de Aeronáutica, São José dos Campos, São Paulo 12228-900, Brazil
  • 3Departamento de Engenharia Mecânica, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
  • 4Institut PPRIME, CNRS, University of Poitiers, ENSMA, 86000 Poitiers, France

  • *tissot.gilles@gmail.com
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Phys. Rev. Fluids 2, 093901 – Published 18 September, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.093901

Abstract

Instability waves traveling within subsonic turbulent jets have a modal linear growth until approximatively the end of the potential core. At these stations it is believed that nonlinear and/or nonmodal effects become important and a mismatch appears between experimental measurements and linear models. In this paper the response of the linearized operator to nonlinearities treated here as an external forcing is found to be consistent with a simplified model of the Orr mechanism, supporting the idea that a nonmodal growth of disturbances occurs in the downstream region of the jet in response to the modeled nonlinear forcing.

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Phys. Rev. Fluids 2, 093901– Published 18 September, 2017
  • Received 17 October 2016

©2017 American Physical Society

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