Appropriate mesh for resolving noise frequency

Henry Arrigo · June 29, 2014, 14:18

Hi
Is there any equivalent option in CFX to what is known as the "Mesh Frequency Cut-off" option in Star-CCM+?
If not, how is it possible to get sure that a CFX mesh can resolve target frequencies?

ghorrocks · June 29, 2014, 19:34

I do not know what Mesh frequency cut off in Star is. Can you please explain it?

Henry Arrigo · June 30, 2014, 07:00

"The mesh frequency cutoff scalar function can be used to qualify the suitability of the mesh ahead of a transient calculation by analyzing the frequency that the mesh can resolve. This analysis determines where and by how much to refine the mesh to capture up to the desired frequency. If, for example, the function value shows 1 kHz and you want to resolve up to 2 kHz, then refine the mesh by a factor of two."

ghorrocks · June 30, 2014, 08:44

CFX does not have anything like this built in. If you know the maths which defines the function then you can probably generate it as a user variable.

June 29, 2014, 14:18	Appropriate mesh for resolving noise frequency	#1
Henry Arrigo Senior Member Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 15	Hi Is there any equivalent option in CFX to what is known as the "Mesh Frequency Cut-off" option in Star-CCM+? If not, how is it possible to get sure that a CFX mesh can resolve target frequencies?

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June 29, 2014, 19:34		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	I do not know what Mesh frequency cut off in Star is. Can you please explain it?

June 30, 2014, 07:00		#3
Henry Arrigo Senior Member Henry Arrigo Join Date: Jun 2010 Location: Italy Posts: 100 Rep Power: 15	"The mesh frequency cutoff scalar function can be used to qualify the suitability of the mesh ahead of a transient calculation by analyzing the frequency that the mesh can resolve. This analysis determines where and by how much to refine the mesh to capture up to the desired frequency. If, for example, the function value shows 1 kHz and you want to resolve up to 2 kHz, then refine the mesh by a factor of two."

June 30, 2014, 08:44		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	CFX does not have anything like this built in. If you know the maths which defines the function then you can probably generate it as a user variable.