Noise Prediction Software

ITAC has extensive experience in jet noise research and the development of advanced software for aeroacoustics applications. Two of ITAC's latest technologies are highlighted below.

CHOPA

CHOPA

The “Compressible High Order Parallel Acoustics” code is developed jointly with Professor Philip Morris’s group at Pennsylvania State University. CHOPA provides effective engineering predictions of the acoustic nearfield using moderate resources. While the primary applications of CHOPA to date have been in hot supersonic jet noise, it is by no means restricted to these configurations.

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Noise source modeling and prediction

Noise source modeling and prediction

In partnership with Prof. Morris and OptiNav, Inc., ITAC has developed a new wavepacket-based model for jet noise sources which has been implemented into OptiNav’s Beamform Interactive microphone array data processing package. This technology provides significantly improved detection of noise producing regions in jet plumes.


Overview

High Order Parallel Computing (4th Order)

  • More accuracy with less computer resources
  • Provides engineering results on modest systems

Immersed Boundary Method (IBM)

  • Allows incorporation of small geometric features without requiring full body-fitted mesh generation
  • Used for exploring noise reduction technologies such as chevrons and vortex generators

Non-Linear Disturbance Equations (NLDE)

  • Allows effects of full physical domain to be included in aeroacoustic analysis at reduced cost
  • Larger steady-state CFD solution naturally provides boundary conditions for aeroacoustic runs
  • Impacts such as the effect of full aircraft and/or carrier deck can be captured.

Non-Matching Boundaries

  • Used to enable high resolution meshing in specific regions
  • Local high‐order interpolation at block boundaries

Implicit Solver

  • Second order in time
  • Newton sub‐iterations or dual time stepping to maintain temporal accuracy
  • Significant speed-up over earlier explicit schemes

  • The software is currently being used for high‐speed jet simulations
  • Hot and cold jets can be modeled
  • Supersonic and subsonic jets are possible
  • Initial NLDE capability has been implemented
  • Currently at TRL 4, Planned TRL 6 in two years

Potential transition programs are F‐18, Joint Strike Fighter (JSF) (jet noise reduction, nozzle design) and Versatile Affordable Advanced Turbine Engines (VAATE). Can also be applied to aeroacoustical analysis of future air vehicles (both crewed and crewless).
  • Noise prediction from aircraft jet engines
  • Investigation of jet noise reduction technologies
  • General aeroacoustics applications (compressible flow)

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