Effect of large-eddy simulation fidelity on predicted mechanisms of jet noise reduction

Jeonglae Kim, Daniel J. Bodony, Jonathan B. Freund

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The aeroacoustic control of a Mach 1.3 turbulent jet demonstrates an unexpectedly subtle importance of accurate numerics for predicting and reducing turbulent jet noise. We observe that two nominally high-wave-number filters (as used to stabilize large-eddy simulations), one explicit that is optimized based upon an integral criterion and the other implicit with a tunable parameter, lead to significant changes in the near-field turbulence with concomitant changes in the acoustic field on the order of 2-4 dB. An apparent consequence is that an adjoint-based optimization procedure identifies different controls for the two simulated jets despite similar reductions of radiated sound. This suggests that sound-generating mechanisms of the Mach 1.3 turbulent jet may be more fundamentally modified by subtle changes in numerics than previously expected.

Original languageEnglish (US)
Pages (from-to)259-268
Number of pages10
JournalJournal of Propulsion and Power
Volume28
Issue number2
DOIs
StatePublished - Mar 1 2012
Externally publishedYes

Fingerprint

jet aircraft noise
turbulent jets
large eddy simulation
Large eddy simulation
Noise abatement
noise reduction
acoustics
Mach number
aeroacoustics
Acoustic waves
Aeroacoustics
near fields
Acoustic fields
turbulence
filters
optimization
Turbulence
filter
effect
sound

ASJC Scopus subject areas

  • Aerospace Engineering
  • Fuel Technology
  • Mechanical Engineering
  • Space and Planetary Science

Cite this

Effect of large-eddy simulation fidelity on predicted mechanisms of jet noise reduction. / Kim, Jeonglae; Bodony, Daniel J.; Freund, Jonathan B.

In: Journal of Propulsion and Power, Vol. 28, No. 2, 01.03.2012, p. 259-268.

Research output: Contribution to journalArticle

Kim, Jeonglae ; Bodony, Daniel J. ; Freund, Jonathan B. / Effect of large-eddy simulation fidelity on predicted mechanisms of jet noise reduction. In: Journal of Propulsion and Power. 2012 ; Vol. 28, No. 2. pp. 259-268.
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