Aero-acoustics in a tangential blower: validation of the CFD flow distribution using advanced PIV techniques

Jean-Yves Noël, Mark Farall, Luca Casarsa


Noise reduction is of increasing importance in the community. Consequently, the development of aero-acoustics is gaining special focus within industry. Computational Aero-Acoustics (CAA), the coupling of Computational Fluid Dynamics (CFD) and Computational Acoustics (CA), is being used in the design and assessment of a range of products from HVAC ducts to domestic appliances.

The process for carrying out an Aero-Acoustic simulation begins with the solution of the transient flow dynamics in order to compute accurately the pressure fluctuations at a number of points in the computational domain. These fluctuations are passed to the acoustic code to propagate the acoustic waves through the system and determine its acoustic signature. To minimize errors in the acoustic propagation analysis it is thus essential that accurate predictions of the noise sources be obtained.

This paper concentrates on the CFD part of the aero-acoustic simulation. The case considered has been taken from the European project DESTINY:3 and comprises a tangential blower located inside a complex duct system. Air is drawn into the fan through two inlets and exits through a single duct. The computational methodology and flow field predictions are presented and compared to experimental PIV data. The numerical predictions were found to be in good agreement with the experimental data, reproducing the asymmetries in the flow field. 

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Research for a Quieter Europe in 2020 – An Update Strategy Paper for the CALM Network – Oct. 2004.

Lighthill “On sound generated aerodynamically” Proc. Roy. Soc. (London) Vol. A211, 1952.

William K. Blake “Mechanics of Flow-induced Sound and Vibration – Volume 1: General Concepts and Elementary Sources” Ed. Academic Press, Inc 1986.

W-H. JEON et al. “Analysis of unsteady flow field and aeroacoustic noise of an air-conditioner including cross flow fan”, Fan Noise 2003 Proceedings.

Alex Read et al. “Comparison between measured and predicted tonal noise from a subsonic fan using a coupled Computational Fluid Dynamics (CFD) and Computational Acoustics (CA) approach.” AIAA 2004-2936.

Mehmet çavu ̧s et al. “Aeroacoustic Noise Prediction of an axial fan in a circular duct with LES” Ankara International Aerospace Conference -2005-092.

F. Mendonca et al. “Towards understanding LES and DES for Industrial Aeroacoustic Predictions”, International Workshop on ‘LES for Acoustics’, DLR Gottingen, Germany, 7–8th October 2002.

G. Constantinescu “Handout: Large Eddy Simulation IV- Wall Models ^ Hybrid RANS-LES methods”, 058:268 Turbulent Flows.

Bakker A. “Sliding Mesh Simulation of Laminar Flow in Stirred Reactors”, Published in “The Online CFM Book” at - February 2000.

S. Caro et al. “A New CAA Formulation based on Lighthill’s Analogy applied to an Idealized Automotive HVAC Blower using AcuSolve and Actran/LA”, AIAA2005-3015.

Markus Raffel et al. “Particle Image Velocimetry: a practical guide”, Springer, 1998.

Riethmuller et al. “Measurements in Particulate Two Phase Flows”, VKI Lecture Series 1981-3, Von Karman Institute for Fluid Dynamics, Belgium.


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