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

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

doi:10.2514/1.B34283

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 journal › Article › peer-review

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 language	English (US)
Pages (from-to)	259-268
Number of pages	10
Journal	Journal of Propulsion and Power
Volume	28
Issue number	2
DOIs	https://doi.org/10.2514/1.B34283
State	Published - 2012
Externally published	Yes

ASJC Scopus subject areas

Aerospace Engineering
Fuel Technology
Mechanical Engineering
Space and Planetary Science

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title = "Effect of large-eddy simulation fidelity on predicted mechanisms of jet noise reduction",

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.",

author = "Jeonglae Kim and Bodony, {Daniel J.} and Freund, {Jonathan B.}",

note = "Funding Information: This work is supported by NASA grant number NNX07AC86A, Cliff Brown and James Bridges Program Managers. Computational support has been provided by the National Science Foundation through TeraGrid Allocation TG-CTS090004.",

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doi = "10.2514/1.B34283",

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T1 - Effect of large-eddy simulation fidelity on predicted mechanisms of jet noise reduction

AU - Kim, Jeonglae

AU - Bodony, Daniel J.

AU - Freund, Jonathan B.

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PY - 2012

Y1 - 2012

N2 - 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.

AB - 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.

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

Abstract

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