Hello,
Is it possible to set outflow boundaries to no condition? I have a 2D fracture plane, modeling the flow diffusion from injecting flow rate. But, as far as I know OGS sets the no flow condition on the outer boundary lines. I want a free flow condition without any fixed pressure set. How should I set that up?
Thanks
Hi!
without any BCs the mathematical problem would not be well-defined.
What you are probably looking for are infinite mapped elements. The issue with these are that they require special shape functions that map the infinite domain onto a finite reference element, which are not yet implemented in OGS.
The way to go in OGS is to set up a sufficiently large model in which finite size effects are negligible.
I.e. setting Dirichlet or in you case probably better Neumann, far-field values. (If you have a diffusion problem, you would guess that at certain domain size the gradient should approach zero). To find out the required domain size you might need to perform a convergence study.
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