Hello Dumuxers!
I need a boundary condition such as the pressure gradientis is zero for
richards and implicit 2p models. How can I do this?
Thanks for your help.
Elena.
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Hi Christoph,
I'm afraid I put it wrong and you did not understand me. I need a free
boundary for the liquid phase. Zero flow means that the fluid does not
leave the area, but I need it to flow out freely. I would use Dirichlet
boundary condition if I could if I could put the border cell pressure
Hello Hai,
what do you mean by weak and strong convergence rate?
A student of my checked the L2 error for refined grids and time steps
with the Richards equation and the FV method. We got the expected first
order convergence.
You can find the detail in his Bachelor's thesis, but it is German
Hi Elena,
if you want the liquid to flow out, you can just specify a Dirichlet
boundary condition by setting it in the boundaryTypesAtPos() function
and setting the value in the dirichletAtPos()in your problem.
If you take the cell pressure also at the boundary this would end up in
Neumann
