[famarcfd]

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!

[Bertrand]

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

[penghust]

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

[cfdnewbie]

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!