February 9, 2023 at 11:56 am
Rob
Ansys Employee

It's something you set, and https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_sec_viscosity.html%23flu_ug_sec_viscosity_non_newtonian gives some of the information you're after.