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-   -   UDF for degassing boundary condition (http://www.cfd-online.com/Forums/fluent-udf/95487-udf-degassing-boundary-condition.html)

peaker007 December 20, 2011 04:02

UDF for degassing boundary condition
 
I am doing simulation about bubble column which gas goes in from the bottom but outflow from the top of reactor. I have read some papers who treated the outlet as a degassing boundary condition. It illustrated as follows:
at the top of the reactor, an outlet boundary condition has
been used for the gas phase and a symmetry boundary condition
has been used for the liquid phase, this degassing condition
has been implemented through a user defined function.
I am not proficient about UDF, who can give me an example UDF for degassing boundary condition or give me some advice about how to write the UDF.Thank you very much for your kindness.

ComputerGuy December 29, 2011 19:47

Peaker007,

Have a look at the Fluent 12 (or up?) UDF manual. Page 2-103 gives a full UDF listing of a degassing boundary condition.

Best,
ComputerGuy

peaker007 December 29, 2011 21:38

Quote:

Originally Posted by ComputerGuy (Post 337336)
Peaker007,

Have a look at the Fluent 12 (or up?) UDF manual. Page 2-103 gives a full UDF listing of a degassing boundary condition.

Best,
ComputerGuy

Thank you very much, computerGuy. I will look at Fluent help for it.

kevinlipps December 19, 2012 15:05

Settings for degassing UDF?
 
Hi,

I'm also simulating a special type of bubble column...

but I have a problem now with the degassing UDF.

I managed to compile the UDF from the Fluent Tutorial, but I don't know what I have to do afterwards.

Could somebody plz explain how to use and setup the degassing UDF step by step? Maybe with a couple of screenshots, if its not too much trouble?

I know, that there is a degassing boundary in Fluent 14.5, but I dont have that version, so I have to stick with the self compiled UDF.

Thx in advance
Kevin

iitgbim December 20, 2012 08:33

Dear Kevin

Will you please share the compiled udf? I have not got any success in compiling this?


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