Learning Forum

[Francesc Riera]

Hi, i've got two questions. First, I wonder what's the difference between Carreau model and the non newtonian power law to simulate the behaviour of a non newtonina fluid? Which is more recommended? And my second question is why sometimes CFD-Post allows me to see the wall shear results and sometimes don't while i'm simulation a non newtonian flow. Thanks

 

[Rob]

The various nonNewtonian models were created to cope with the wide range of viscous behaviour. So, pick the one that best matches the data you have. Hence, there's a Carreau-Yasuda example on the Customer Portal (students don't have access) as it's good for blood and not in the core Fluent solver. 

If you're using Fluent do the post-processing there. Not sure why wall shear is/isn't available but it's likely linked to model settings and what's included in the data files.