How to implement new correlations in RPI wall boiling Model in CFX?

behzad-cfd · February 5, 2017, 15:03

Hi dear forumers,

I want to simulate subcooled boiling in a microchannel?
I tried RPI wall boiling model but it's results aren't satisfactory for micro scale. There are some other correlations for micro scale other than RPI correlations.
now question is that how can i implement this correlations in CFX?
In Fluent we write UDF file how is the procedure in CFX?
any hint, guidance and tutorial is appreciated.

Thanks in advance,

ghorrocks · February 5, 2017, 18:55

If you are just changing constants in the model then you just change the constants. If you define the alternate correlations with CEL or user fortran you can define the value to be a function of other things, and replace the model constants with your functions.

You can add entirely new ODEs or PDEs to the model as well, and depending on exactly what you are trying to this could be complex or easy.

February 5, 2017, 15:03	How to implement new correlations in RPI wall boiling Model in CFX?	#1
behzad-cfd Member behzad Ghasemi Join Date: Sep 2013 Location: Iran Posts: 56 Rep Power: 13	Hi dear forumers, I want to simulate subcooled boiling in a microchannel? I tried RPI wall boiling model but it's results aren't satisfactory for micro scale. There are some other correlations for micro scale other than RPI correlations. now question is that how can i implement this correlations in CFX? In Fluent we write UDF file how is the procedure in CFX? any hint, guidance and tutorial is appreciated. Thanks in advance,

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February 5, 2017, 18:55		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,872 Rep Power: 144	If you are just changing constants in the model then you just change the constants. If you define the alternate correlations with CEL or user fortran you can define the value to be a function of other things, and replace the model constants with your functions. You can add entirely new ODEs or PDEs to the model as well, and depending on exactly what you are trying to this could be complex or easy.