How to make the fluid viscoity changable

MFiX
#1

Hello, everyone!
I need help. Is there anyone know how to make the fluid viscoity changing with temperature which means not constant.Change the option of viscosity from the ‘constant’ to ’ Sutherland’s law’ is this operation can achieve my goal? Or there has something else methods?

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Looking forwards to your apply. Many thanks.

#2

The Sutherland’s law is a temperature dependent function. This is appropriate for air. If you need other relationship, you can code your own UDF (User-Defined-Function) in the subroutine USR_PROP_MUG in the file usr_properties.f. Then select UDF in the viscosity menu, and build the solver so the changes are taken into account. Make sure you select this custom solver when you run the simulation.

#3

Thanks for your reply. It is very useful !!!