|December 9, 2014, 18:10||
How to express strain rate in Comsol
Join Date: Jun 2014
Posts: 4Rep Power: 4
I am relatively new to simulation. I have a question in COMSOL but it is quite general. I am trying to define an analytic function in COMSOL. The equaiton is Carrea_Yasuda fluid model. It is non newtonian fluid model that is function of shear rate. How to write an expression for the shear rate for a 3D problem?
Thank you very much for your help.
|December 10, 2014, 12:34||
Join Date: Apr 2010
Posts: 204Rep Power: 9
Strain rate and shear rate are tensors, and that's how they're solved in 3-D. The lab data you fit to parameterize non-Newtonian models are usually from a testing apparatus that is essentially 1-D, so the tensor has a lot of zeros and can be represented as a single scalar value. That shouldn't stop you from being able to parameterize the fluid; you don't need to know the 3-D characteristics of the flow, you just need to know the lab data.
This is a FLOW-3D forum, not a Comsol forum, so you're not likely to get an answer here that's more detailed than that.
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