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Efficient jet noise models using the one-way Euler equations

Towne, Aaron and Colonius, Tim (2014) Efficient jet noise models using the one-way Euler equations. In: 168th Meeting of the Acoustical Society of America, 27-31 October 2014, Indianapolis, IN.

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Experimental and numerical investigations have correlated large-scale coherent structures in turbulent jets with acoustic radiation to downstream angles, where sound is most intense. These structures can be modeled as linear instability modes of the turbulent mean flow. The parabolized stability equations have been successfully used to estimate the near-field evolution of these modes, but are unable to properly capture the acoustic field. We have recently developed an efficient method for calculating these linear modes that properly captures the acoustic field. The linearized Euler equations are modified such that all upstream propagating acoustic modes are removed from the operator. The resulting equations, called one-way Euler equations, can be stably and efficiently solved in the frequency domain as a spatial initial value problem in which initial perturbations are specified at the flow inlet and propagated downstream by integrating the equations. We demonstrate the accuracy and efficiency of the method by using it to model sound generation and propagation in jets. The results are compared to accurate large-eddy-simulation data for both subsonic and supersonic jets.

Item Type:Conference or Workshop Item (Paper)
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URLURL TypeDescription ItemConference Site ItemConference Program
Towne, Aaron0000-0002-7315-5375
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2014 Acoustical Society of America. Published Online: 23 October 2014.
Subject Keywords:Fluid jets; Auditory system; Fluid dynamics; Acoustic phenomena; Acoustic noise; Supersonic jets; Acoustics; Turbulence simulations; Sound generation; Acoustic field
Record Number:CaltechAUTHORS:20190712-112322554
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97117
Deposited By: Melissa Ray
Deposited On:15 Jul 2019 20:47
Last Modified:16 Nov 2021 17:26

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