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-   -   How can I use NITA in VOF and UDS (separately)? (http://www.cfd-online.com/Forums/fluent/99687-how-can-i-use-nita-vof-uds-separately.html)

DaddySpeleo April 9, 2012 19:20

How can I use NITA in VOF and UDS (separately)?
 
Hi!
My task contains two part.
1. I solve UDS.
2. Then I use obtained data as source term and try to solve task with VOF and NITA.
(and I want to repeat it some times)

But... If I have UDS - of course turned off in EQUATIONS - I got message: "noniterative solver is not available with UDS."

What can I do to fix it?
Of cource I can remove UDS -but then I lose the data.
Best regards...

sbaffini April 19, 2012 09:44

According to the tasks you need to accomplish you may consider the use of user defined memories instead. Usually the biggest difficulty is in the computation of gradients which require some additional coding (a Green-Gauss cell based algorithm can be easy to be done). Sometimes (but probably not now), the temperature equation can be used conveniently

DaddySpeleo April 19, 2012 13:11

Yes. Now I use UDM and copy data from UDS to UDM, then remove UDS, then solve VOF, then create UDS... And I should do it ten times. :)
I do not understand the creators of Fluent in this case... but - it is the method to stimulate study of Scheme-programming. :)


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