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The results, using a transient RANS model, are qualitatively consistent with the physical mechanism of noise generation in rotor-stator interaction and the simulation correctly computed the blade-passing frequency. Fan in duct with simple stator - pressure field on the blades.
Courtesy of FIAT Research Center.
  
From:
Research: CFX makes a Big Bang in Aero-Acoustics
Posted Wed January 08, 2003 @11:13AM
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ANSYS CFX by Christiane Montavon, CFX

The physics of aero-acoustics makes modeling a challenging task; pressure fluctuations produce noise, which propagates over large distances far from its source. To simulate these phenomena, it is necessary both to model the detailed fluctuating flow in the neighborhood of the sound source, and the far-field propagation effects.

The primary aim of the EU Alessia Project has been to develop software tools for the simulation of fluctuating flows, with particular focus on flow-induced acoustics. The partners in the project are CFX, Technical University of Munich, Shell, Alfa Laval, LMS and Fiat Corporate Research.

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