CFX and acoustic analysis

mahdinili · September 21, 2011, 11:17

Hi

I want to model a noise propagation problem near the flow exiting a nozzle by CFX. Please help me to find a tutorial to do it.

michael_owen · September 21, 2011, 12:51

There is no tutorial to do this. CFX does not have an acoustic solver. It can be done, but it is an advanced use of CEL and is computationally expensive, as it must be done in the time domain rather than the frequency domain.

Biskvito · September 21, 2011, 16:16

Hi Mahdinili

maybe there is not exectly what you are looking for but there is a macro availible only for low speed turbomachinery (Mach<0.4) in CFX-Post, tab - Turbo/Turbo Macros/Turbo Noise.
This macro has only a few options and gives you Sound Pressure Level, Sound Power Level, overall and for each harmonic frequency, and directivity of harmonics. But maybe you can use it indirectly.

By the way, does anybody know how that macro works?

September 21, 2011, 11:17	CFX and acoustic analysis	#1
mahdinili New Member mahdi Join Date: Sep 2011 Location: Iraq Posts: 7 Rep Power: 14	Hi I want to model a noise propagation problem near the flow exiting a nozzle by CFX. Please help me to find a tutorial to do it.

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September 21, 2011, 12:51		#2
michael_owen Senior Member Michael P. Owen Join Date: Mar 2009 Posts: 196 Rep Power: 17	There is no tutorial to do this. CFX does not have an acoustic solver. It can be done, but it is an advanced use of CEL and is computationally expensive, as it must be done in the time domain rather than the frequency domain.

September 21, 2011, 16:16		#3
Biskvito New Member Join Date: Aug 2011 Location: Cracow, Poland Posts: 7 Rep Power: 14	Hi Mahdinili maybe there is not exectly what you are looking for but there is a macro availible only for low speed turbomachinery (Mach<0.4) in CFX-Post, tab - Turbo/Turbo Macros/Turbo Noise. This macro has only a few options and gives you Sound Pressure Level, Sound Power Level, overall and for each harmonic frequency, and directivity of harmonics. But maybe you can use it indirectly. By the way, does anybody know how that macro works?