Computation of Large-Scale Structure Jet Noise Sources with Weak Nonlinear Effects Using Linear Euler | Zendy

Milo D. Dahl | Zendy; Duane R. Hixon | Zendy; Reda R. Mankbadi | Zendy

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Computation of Large-Scale Structure Jet Noise Sources with Weak Nonlinear Effects Using Linear Euler

Author(s) -

Milo D. Dahl,

Duane R. Hixon,

Reda R. Mankbadi

Publication year - 2003

Publication title -

nasa sti repository (national aeronautics and space administration)

Language(s) - English

Resource type - Conference proceedings

DOI - 10.2514/6.2003-3254

Subject(s) - nonlinear system , computation , scale (ratio) , noise (video) , computer science , euler's formula , jet (fluid) , jet noise , statistical physics , acoustics , physics , mathematics , algorithm , mathematical analysis , mechanics , artificial intelligence , quantum mechanics , image (mathematics)

An approximate technique is presented for the prediction of the large-scale turbulent structure sound source in a supersonic jet. A linearized Euler equations code is used to solve for the flow disturbances within and near a jet with a given mean flow. Assuming a normal mode composition for the wave-like disturbances, the linear radial profiles are used in an integration of the Navier-Stokes equations. This results in a set of ordinary differential equations representing the weakly nonlinear self-interactions of the modes along with their interaction with the mean flow. Solutions are then used to correct the amplitude of the disturbances that represent the source of large-scale turbulent structure sound in the jet.

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