Error when using non clipped pressure and density

SteffenBcfd · October 16, 2023, 09:44

Hello,

I'm trying to use the non-clipped absolute pressure and density for a source term in CFX. Unfortunately, I’m running into errors when I'm implementing this (see the pictures attached).
I use an additional variable named pnc, activate it into fluid setup and assign the variable pabsnc (non clipped absolute pressure), but it seems like the variable is not valid.
When I use pabs instead, no error is assigned, but pabsnc is called unavailable.
(I use Ansys WB R19.2)
Maybe someone has a hint.

Best regards
Steffen

ghorrocks · October 16, 2023, 17:59

No images were attached. This FAQ describes how to attach images: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F

Please post the CCL of what you are trying to do, or the output file (especially if that reports an error).

SteffenBcfd · October 17, 2023, 04:41

I’m struggling with the cfd online forum servers, most of the time I can’t reach the side due to slow response. When I upload pictures in the post, it’s even worse. By the way, there is not much to say about the issue. When I try to use pabsnc or densitync in a CEL expression or an additional variable I get the error message.

ghorrocks · October 17, 2023, 05:10

You cannot tell much from the screen shots. Please upload your CCL, which is a small text file so easily uploaded. If you do not know how to export CCL it is under File/Export/CCL I think. You can also right click on the tree and choose Command Editor and copy/paste the CCL into a text file.

SteffenBcfd · October 25, 2023, 16:39

Here is the associated CCL File

ghorrocks · October 25, 2023, 17:55

That is a very complex set of CEL expressions and I am not going to be able to debug that for you.

The VARIABLES file says the variable pabsnc is available in CEL. So maybe if you set a CEL expression equal to pabsnc (pabsnc_temp = pabsnc) and then set your additional variable equal to pabsnc_temp it might work.

SteffenBcfd · October 26, 2023, 02:57

If found the error source.
It has nothing to do with the expressions, pabsnc and densitync are only available if you activate the cavitation mass transfer in the fluid pair tab.
After this the variables are accessible, looks strange but its working.

October 16, 2023, 17:59		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,781 Rep Power: 143	No images were attached. This FAQ describes how to attach images: https://www.cfd-online.com/Wiki/Ansy...n_the_forum.3F Please post the CCL of what you are trying to do, or the output file (especially if that reports an error). SteffenBcfd likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

October 17, 2023, 05:10		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,781 Rep Power: 143	You cannot tell much from the screen shots. Please upload your CCL, which is a small text file so easily uploaded. If you do not know how to export CCL it is under File/Export/CCL I think. You can also right click on the tree and choose Command Editor and copy/paste the CCL into a text file. SteffenBcfd likes this. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

October 25, 2023, 17:55		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,781 Rep Power: 143	That is a very complex set of CEL expressions and I am not going to be able to debug that for you. The VARIABLES file says the variable pabsnc is available in CEL. So maybe if you set a CEL expression equal to pabsnc (pabsnc_temp = pabsnc) and then set your additional variable equal to pabsnc_temp it might work. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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October 26, 2023, 02:57		#7
SteffenBcfd New Member Steffen Join Date: Jul 2022 Posts: 10 Rep Power: 4	If found the error source. It has nothing to do with the expressions, pabsnc and densitync are only available if you activate the cavitation mass transfer in the fluid pair tab. After this the variables are accessible, looks strange but its working.