Regarding implementation of modified Carreau Yasuda model
 

Hello everyone,

I am working on a multiphase problem in an arterial geometry and want to apply modified Carreau-Yasuda model. The formula has been attached in the image below. Can anyone please help me with this? I have tried via writing an expression for viscosity but in that I am not able to enter 'volume fraction' as a variable.

Can anyone suggest some alternate way to do this?

Thanks!