Simulation of Supersonic Jet Screech Noise using Direct Computational Aeroacoustics (CAA)
In this tutorial, we provide guidelines for modeling and simulation of a Supersonic Jet Screech Noise generated by an axisymmetric supersonic jet. We use direct computational aeroacoustics (CAA) in ANSYS FLUENT.
You will also learn how to do the following through this tutorial:
- Modifying constants for free jet flow in realizable k-e turbulence model and then conducting axisymmetric simulation of a steady-state supersonic jet flow
- Using direct CAA and unsteady realizable k-e turbulence model to calculate unsteady flow and acoustic near field
- Preparing data for spectral analysis by saving acoustic data at nearfield microphone
- Also, post-processing and analyzing the flowfield aeroacoustic results
Problem Description of Supersonic Jet Screech Noise Modeling
Supersonic jet noise contains following components. 1- Broadband shock-associated noise. 2- Turbulent mixing noise. 3- Screech tones. Here we model turbulent air flow. The cold jet has Mach 1.2 and exits from 1” diameter round nozzle with 0.625” thick lip. We have obtained the nozzle geometry and flow conditions from Experiments performed by Ponton and Seiner.
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