yield stress in Elmer?

Numerical methods and mathematical models of Elmer
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einatlev
Posts: 47
Joined: 13 Jan 2010, 06:54

yield stress in Elmer?

Post by einatlev »

Hello
I'm looking for a way to model a Bingham fluid in Elmer. It is a fairly simple rheology: behaves as a solid (that is - -zero strain, infinite viscosity) when stress is below a critical yield stress value, and then as a linear Newtonian viscous fluid when stress is higher than the defined yield stress.
Is there something like that in Elmer already? I couldn't find any...
I presume if it doesn't exist yet I will need to change "MaterialModels.src", correct? how do I get access to the local stress conditions from there?
thanks!
Einat
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