|October 3, 2007, 03:20||
Casson CEL expression
I'm having trouble creating an expression for the casson model.
I inputed the following functions in CFX:
Mu: ((Eta^2*J2)^(1/4)+2^(-1/2)*Tau^(1/2))^2*J2^(-1/2) [kg*m^-1*s^-1]
Eta0: 0.012 [kg*m^-1*s^-1]
CFX is giving me an inconsistent dimensions on the left and right side of the "+" error. Can anyone help with the correct syntax?
|October 3, 2007, 10:06||
Re: Casson CEL expression
The Casson viscosity model is already built-in for ANSYS CFX 11.0. It is hidden from the GUI (will show in 12.0), but you can type the CCL for it. An example is:
LIBRARY: MATERIAL: myfluid
Material Group = User
Option = Pure Substance
Thermodynamic State = Liquid
Option = General Material
Option = Casson
Viscosity Consistency = 10 [kg m^-1 s^-1.0]
Yield Stress = 100 [Pa]
Minimum Shear Strain Rate = 0.001 [s^-1]
Maximum Shear Strain Rate = 100 [s^-1]
The only limitation is that the input can only be "single valued CEL expressions, or constants". I wonder if your consistency is a function of H?
Hope this helps, Opaque
If you are using ANSYS CFX 10.0, then you must be careful with the J2 term because the term "(Eta^2*J2)^(1/4)" does not have units of viscosity.
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