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Old   July 9, 2009, 04:55
Wink Bingham plastic
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Ki-hwan Jun
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I use the Hershel-Berkley viscosity model, because the material that i am modeling is non-newtonian, bingham plastic.(Paste.)

Solver setting is, Unsteady, Laminar, Vof.

I need to change the Paste's viscosity and yield stess value with every time step and calculation.

However, the hershel-berkley viscosity model has 4 sections,
1) K - consistency index, but for bingham model, the value has to be viscosity of the material
2) power index, n
3) yield stress
4) yield viscosity(for bingham model, this value must be very large, so I give the value 10 thousand)

I need to change the (1) and (3) value with time.

I think that I have to use UDF for the process, but there's one problem.
I don't have the source code for the Hershel-berkley viscosity.

What can I do?
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