A time-resolved estimate of the turbulence and sound source mechanisms in a subsonic jet flow

C. E. Tinney, P. Jordan, A. M. Hall, J. Delville, M. N. Glauser

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

A dynamical estimate of the axial component of a Mach 0.60 axisymmetric jet's turbulent velocity field is presented here using spectral linear stochastic estimation. The pressure field surrounding the exit of the jet is employed as the unconditional parameter in the estimation technique. A sub-grid interpolation method is used to improve the spatial resolution of the estimate. The model estimate is time-resolved and reconstructed using a purely experimental database. A decomposition of the model estimate using POD and Fourier-azimuthal techniques identifies the turbulent velocity modes that are responsible for driving the near-field pressure when compared with direct measurements of the jet's modal features. In effect, the signatures left in the near pressure field by the turbulence are a result of the low-order structure, the higher azimuthal modes being inefficient in driving the hydrodynamic pressure. A direct calculation of the source field using a Lighthill approach is performed, from which the low-dimensional features of the sound source mechanisms are illustrated.

Original languageEnglish (US)
Pages (from-to)1-20
Number of pages20
JournalJournal of Turbulence
Volume8
DOIs
StatePublished - 2007

ASJC Scopus subject areas

  • Computational Mechanics
  • Condensed Matter Physics
  • Mechanics of Materials
  • Physics and Astronomy(all)

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