# Computational Aero-Acoustic

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 December 15, 2010, 02:29 Computational Aero-Acoustic #1 New Member   Join Date: Oct 2009 Posts: 22 Rep Power: 16 Hi all, at my work i have to perform acoustic analisys on the impeller of a new axial flow fan: i would use a computational aero-acoustic (CAA) approach to realize my study and so, i'd like get some information about CAA. How can i implement this type of approach? Are CAA analysis as reliable as CFD predictions? Can someone answer me? Thanks in advance!

 February 8, 2011, 04:42 #2 New Member   Bertrand Delvaux Join Date: Apr 2010 Posts: 29 Rep Power: 16 Hi famarcfd, I'm working on the same kind of problem, right now, so unfortunately I cannot bring you some answers but only try to help each other. Of what I learned, it is necessary to split up your problem in 2 parts : the aerodynamics part, with your noise source, being solved by a CFD code, and then a wave propagation code to simulate its radiation from the near field to the far field. I hope this helps. What kind of CAA code do you intend to use? Regards, Bertrand

 August 23, 2011, 07:14 #3 New Member   Peng Join Date: Aug 2011 Posts: 2 Rep Power: 0 hi Bertrand, if i want to write a code based on the FW-H equation to predicte the far-field noise, what should i do? any information will be great appreciated. Peng

August 24, 2011, 15:04
#4
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cfdnewbie
Join Date: Mar 2010
Posts: 557
Rep Power: 20
Quote:
 Originally Posted by famarcfd Hi all, Are CAA analysis as reliable as CFD predictions? Can someone answer me? Thanks in advance!

CAA includes a number of methods, from solving some equations for the acoustic field on a background flow up to a full DNS, where the acoustics come about naturally as a part of the NS solution....

so what level of abstraction/modeling are you talking about??

Wiki might indeed give you a good overview of what is out there:
http://en.wikipedia.org/wiki/Computa..._Aeroacoustics

Cheers!