UDF Herschel Bulkley
 

Hi everybody, I'm working with fluent 16.1, and I need to program an UDF with a Herschel Bulkley viscosity function (Birmimgham Pseudoplastics). This programme is headed to get to know how to program correctly UDFs.

My problem is that I don't know how to access to the "Shear rate" variable in fluent to perform my code.

Thank u very much, I will be very please if u could help me.

Maybe you should refer to some research papers to see how you can model this.

Hi,

Try using C_STRAIN_RATE_MAG. Check out the following link:

https://www.cfd-online.com/Forums/fl...uspension.html

-B

Hi! Did you validate your UDF somehow?
I am trying to do this by simulating a flow between two paralell plates and compare with the analytical results. But the results did not match at all...