Hi All,

I'm trying to simulate 3D blood flow using Casson model as Dynamic Viscosity. I created a material in CFX-Pre and entered data previously suggested by Opaque. Here are the details when I open the material in command editor:

LIBRARY: MATERIAL: Casson

Material Group = User

Object Origin = User

Option = Pure Substance

PROPERTIES:

Option = General Material

DYNAMIC VISCOSITY:

Maximum Shear Strain Rate = 100 [s^-1]

Minimum Shear Strain Rate = 0.001 [s^-1]

Option = Casson

Viscosity Consistency = 10 [kg m^-1 s^-1.0]

Yield Stress = 100 [Pa]

END

EQUATION OF STATE:

Density = 1050 [kg m^-3]

Molar Mass = 1e-10 [kg kmol^-1]

Option = Value

END

END END END

CFX is giving me the following error: "The parameter "Option in "/LIBRARY/MATERIAL:Casson/PROPERTIES/DYNAMIC VISCOSITY" has the value "Casson". This does not match any of the allowed values: "Value, Sutherlands Formula, Rigid Non Interacting Sphere Model".

Can anyone help with this?

Thanks, CC.

Dear CC,

Are you using ANSYS CFX 11.0? If you are, please write the definition file and see what the solver does.

The "generalized non-newtonian models" are not allowed in the GUI (beta hidden capability), but they should work in the solver.

Keep us posted, Opaque