Visualising the interphase mass transfer rate in Post

Gert-Jan · September 4, 2019, 15:34

Hi All,

In an Eulerian setup I have an air and water phase with a component (e.g., CO2) transferring from air to water or the other way around, depending on the concentration differences. This works pretty well using Henry's law.
However, now I want to visualise the source term for this transfer, either positive or negative (the output file says I have both). But in Post this source term is not available, so I cannot visualise it in a straightforward way. Anyone knows an easy workaround?

Regards, Gert-Jan

ghorrocks · September 4, 2019, 18:57

Sorry, I can't help you there. I can just suggest some guesses you might have already thought of - like defining a CEL variable which matches the CO2 transfer equation and then you can send it to an additional variable for post processing.

Gert-Jan · September 5, 2019, 04:11

The stupid thing is that with Lagrangian setup, sources are available for postprocessing, but with Eulerian not. But Eulerian is preferred since it has Henry's law built in by default.
Probably I indeed have to built in Henry's law my self through CEL, allowing me to visualise the sources.

September 4, 2019, 15:34	Visualising the interphase mass transfer rate in Post	#1
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	Hi All, In an Eulerian setup I have an air and water phase with a component (e.g., CO2) transferring from air to water or the other way around, depending on the concentration differences. This works pretty well using Henry's law. However, now I want to visualise the source term for this transfer, either positive or negative (the output file says I have both). But in Post this source term is not available, so I cannot visualise it in a straightforward way. Anyone knows an easy workaround? Regards, Gert-Jan

September 4, 2019, 18:57		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Sorry, I can't help you there. I can just suggest some guesses you might have already thought of - like defining a CEL variable which matches the CO2 transfer equation and then you can send it to an additional variable for post processing. __________________ Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.

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September 5, 2019, 04:11		#3
Gert-Jan Senior Member Gert-Jan Join Date: Oct 2012 Location: Europe Posts: 1,827 Rep Power: 27	The stupid thing is that with Lagrangian setup, sources are available for postprocessing, but with Eulerian not. But Eulerian is preferred since it has Henry's law built in by default. Probably I indeed have to built in Henry's law my self through CEL, allowing me to visualise the sources.