You have two different ways to simulate a non-newtonian flows with Star CD :
You can choose only the values of m and n parameters.
How to proceed :
You had to go to the Molecular Properties item in the Star
GUIde and select NonNewt in the Viscosity stream.
Then you had to specify the values of the model parameters m and
n.
You have access to the subroutine treating the molecular viscosity
in the code called VISMOL. You can modify it as you want and then called
it in the Star GUIde panel during the computation by choosing option User
Subroutine in the Run Analysis Interactively.
As we can not have access to the value of tau in the subroutine in
which the viscosity is calculated, we used the model of Bingham and Herschel-Bulkley,
which can be defined as follows: