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-   -   Acoustic field in a centrifugal fan (http://www.cfd-online.com/Forums/openfoam/82956-acoustic-field-centrifugal-fan.html)

mrshb4 December 9, 2010 17:17

Acoustic field in a centrifugal fan
 
Hi everyone
I want to work on the noise prediction of a centrifugal fan with radios about 30cm.(745 rpm)
The question is because I should predict pressure fluctuations, should I solve the flow compressible or incompressible?!!!
And what solvers should I use?!!

thanks
Mohammadreza

woody December 10, 2010 01:59

Hi Mohammadreza,

sounds quite incompressible, so I would recommend icofoam. I only do compressible simulations with rhoPisoFoam...

Depends on what you want to simulate...

Maybe you should first define your goals before you select the solver...

mrshb4 December 10, 2010 05:19

even for acoustic field?!
 
Dear Tobias
Thank you for your answer. I know that the flow is incompressible and it should be solved with solvers MRFSimpleFoam(for steady) and turbDyMFoam(for unsteady). But my question is acoustic field is something different from flow field. I mean noise generation and propagation is something based on pressure fluctuaion and relatively density fluctuation. In this kind of problems, should I still solve the flow incompressible?!!

Thanks
Mohammadreza


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