Harmonic perturbations in turbulent wakes

Nicolas Reau, Anatoli Tumin

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

A theoretical model of harmonic perturbations in far turbulent wakes is considered. The proposed model is based on the triple decomposition method. It is assumed that the instantaneous velocities and pressures consist of three distinctive components: the mean (time-averaged), the coherent (phase-averaged), and the random (turbulent) motion. The interaction between incoherent turbulent fluctuations and large-scale coherent disturbances is incorporated by means of a Newtonian eddy viscosity model. For high-amplitude perturbations, the nonlinear feedback to the mean flow is taken into account by means of the coherent Reynolds stresses. The equations for the mean flow are coupled with the linearized equations for the disturbances, taking into account the mean flow nonparallel effects. The model resolves uncertainties noted in previous theories and provides a correct comparison with available experimental data. The effect of the harmonic perturbations on the turbulent wake growth at high amplitudes is investigated as well.

Original languageEnglish (US)
Pages (from-to)526-530
Number of pages5
JournalAIAA journal
Volume40
Issue number3
DOIs
StatePublished - Mar 2002

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ASJC Scopus subject areas

  • Aerospace Engineering

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