I am looking for some advice regarding cryogenic modeling in ANSYS FEA software. I have been trying to use the Transient Thermal module, in workbench 14.5, to model the cooling of a device in a dilution fridge.
I have approximate values for the cooling power of each plate in the fridge, and I have the material properties for the fridge components, and the device I wish to cool, though I am having some difficulties in setting the model up.
For example the 70K plate has a cooling power of approximately 2W, though it should never get below 70K. When I try to run this in ANSYS, I can’t find a way of telling the software that this lower limit exists.
Would someone please try to explain to me how to achieve this?
-CR
CSA Archive 
Ansys workbench is a good simulation platform, but it’s not easy to use for complicate model. For your temperature-heat flux model, you need some iterations, because temperature is closely related to its heat flux. You can make it by inserting commands in Mechanics, however, it’s not an easy way.
Thank you, I agree that it is tricky to be specific using workbench! Could you recommend any other software more suited to use with cryogenic FEA, or any examples of this sort of command being written for ansys?
Actually, both ANSYS Classic and Comsol can do this kind of job. For ANSYS classic, you may need to use APDL (ANSYS’s own language); for Comsol, you may need Matlab for iteration communication.