Aeroacoustic Simulation using CFX

AS_Aero · February 14, 2019, 03:25

Hi All

I have some kind of huge ducts with some valves and nozzles attached to it. high pressure air is passing through these ducts and they are generating some noises and I want to compute the noise sources and see how it is propagated outside the ducts to far field in terms of Sound pressure levels.
My doubt is whether CFX is capable of doing the propagation part as well. Do they have some acoustics solvers for this ? Kindly let me know.
Thanks in advance.

ghorrocks · February 14, 2019, 05:13

Yes, CFX can model noise propagation but it is like getting a Ferrari to run down to the shops and pick up some milk - it is not really a suitable tool for the job.

CFX is a full Navier stokes solver, which can cover acoustic waves. But if all you care about is acoustic propagation you just need a linear acoustic solver. A linear acoustic solver will be hundreds of times faster and easier to use. An example package is SYSNOISE.

I understand SYSNOISE can be coupled to CFX. Then you can model the noise generation and near field in CFX and couple it to the far field model in SYSNOISE. I have never done it, but I have heard it has been done.

AS_Aero · February 14, 2019, 07:08

Dear Glenn

Thanks for your message. But is SYSNOISE an open source software or ?

ghorrocks · February 14, 2019, 16:51

No, it is commercial.

February 14, 2019, 03:25	Aeroacoustic Simulation using CFX	#1
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 15	Hi All I have some kind of huge ducts with some valves and nozzles attached to it. high pressure air is passing through these ducts and they are generating some noises and I want to compute the noise sources and see how it is propagated outside the ducts to far field in terms of Sound pressure levels. My doubt is whether CFX is capable of doing the propagation part as well. Do they have some acoustics solvers for this ? Kindly let me know. Thanks in advance.

February 14, 2019, 05:13		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,934 Rep Power: 145	Yes, CFX can model noise propagation but it is like getting a Ferrari to run down to the shops and pick up some milk - it is not really a suitable tool for the job. CFX is a full Navier stokes solver, which can cover acoustic waves. But if all you care about is acoustic propagation you just need a linear acoustic solver. A linear acoustic solver will be hundreds of times faster and easier to use. An example package is SYSNOISE. I understand SYSNOISE can be coupled to CFX. Then you can model the noise generation and near field in CFX and couple it to the far field model in SYSNOISE. I have never done it, but I have heard it has been done. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

February 14, 2019, 16:51		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,934 Rep Power: 145	No, it is commercial. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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February 14, 2019, 07:08		#3
AS_Aero Senior Member Join Date: Mar 2013 Location: Germany Posts: 357 Rep Power: 15	Dear Glenn Thanks for your message. But is SYSNOISE an open source software or ?