DrAmine
Ansys Employee

I think you want to include the Non-Newtonian property of blood with turbulence model. In turbulent flows the laminar viscosity will be several magnitudes smaller than the the turbulent / flow viscosity. In transition regimes both viscosities might be of similar magnitude and one require a good tranisiton model.

Is your case characterized by rather high blood "laminar" viscosity?

Anyway you can enable turbulence experts settings and be able to sue turbulence modeling on top of a non-newtoninan viscosity model by using turbulence expert option in TUI under define models viscous.