# Writing udf for Transient Heat conduction boundary value problem

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 October 5, 2015, 13:47 Writing udf for Transient Heat conduction boundary value problem #1 New Member   up Join Date: Oct 2015 Posts: 2 Rep Power: 0 I am solving a transient heat conduction boundary value problem and I am stuck at defining the udf for these boundary conditions. Refer to page number 89 of the following paper for the boundary conditions. http://eprints.nmlindia.org/5588/1/81-98.PDF Is it possible to define a udf for this? If yes, how?

 October 6, 2015, 11:20 #2 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 271 Rep Power: 12 Just a tip: you're more likely to get an answer if you explain what it is you want to do and what have you done so far, rather then expect others to study your problem. Cheers.

 October 7, 2015, 05:07 Regarding problem in boundary condition #3 New Member   up Join Date: Oct 2015 Posts: 2 Rep Power: 0 I am solving a heat conduction problem in whcich a spherical shell is formed on a solid sphere. Model equation : From 0

 October 7, 2015, 09:10 #4 Senior Member   Bruno Join Date: Mar 2009 Location: Brazil Posts: 271 Rep Power: 12 If you're ignoring fluid flow, what you have is a pretty straight heat conduction problem with phase change. You can solve that in Fluent without the need of UDFs by using the 3D solver with the solidification model. The BC you mentioned will be handled automatically by Fluent in this case.

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