Noise determination in CFX

shreeshgd · August 14, 2018, 07:37

Hello everyone,

I am trying to carry out CFD analysis of a ceiling fan using MRF, i want to determine how much noise the fan is generating in decibels. Can someone helo how to find the same in CFX post?

ghorrocks · August 14, 2018, 08:34

You cannot extract this data in post processing, not unless you have set it up to output the data in advance.

Put a pressure monitor point somewhere you want the noise level at and rerun the simulation. Extract the pressure versus time history from solver manager and use the formula for sound levels on the pressure history.

shreeshgd · August 16, 2018, 02:46

Dear Glenn,

Thanks for the reply, could you please elaborate on how to put a pressure monitor point in CFX-Pre?

ghorrocks · August 16, 2018, 02:49

Using monitor points is basic CFX stuff - have a look at the tutorial examples available from the ANSYS Customer website or Academic portal.

August 14, 2018, 07:37	Noise determination in CFX	#1
shreeshgd New Member Shreesh Gudi Join Date: Aug 2018 Posts: 2 Rep Power: 0	Hello everyone, I am trying to carry out CFD analysis of a ceiling fan using MRF, i want to determine how much noise the fan is generating in decibels. Can someone helo how to find the same in CFX post?

August 14, 2018, 08:34		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,480 Rep Power: 140	You cannot extract this data in post processing, not unless you have set it up to output the data in advance. Put a pressure monitor point somewhere you want the noise level at and rerun the simulation. Extract the pressure versus time history from solver manager and use the formula for sound levels on the pressure history. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

August 16, 2018, 02:46	Thanks	#3
shreeshgd New Member Shreesh Gudi Join Date: Aug 2018 Posts: 2 Rep Power: 0	Dear Glenn, Thanks for the reply, could you please elaborate on how to put a pressure monitor point in CFX-Pre?

August 16, 2018, 02:49		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,480 Rep Power: 140	Using monitor points is basic CFX stuff - have a look at the tutorial examples available from the ANSYS Customer website or Academic portal. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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