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

6 Scopus citations

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 - 2012

ASJC Scopus subject areas

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

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