is pc = 0? Otherwise I don’t understand the boundary condition.
No, capillary pressure is not zero; however dpc/dn is zero because
dsw/dn is zero (boundary condition on the right edge). So dpw/dn =
dpn/dn. Another boundary condition on the right edge is constant pw so I
calculate the dpw/dn from it and then derive both fluxes.
Your permeability seems to be a matrix. I that correctly implemented?
Should be a diagonal matrix with the identical entries according to
your implementation.
Yes, it is diagonal and K[0][0] = K[1][1]. I postponed a more generic
implementation, so to speak.
If the numeric differentiation does not work, I would rather suspect
that something with your setup is wrong. Non-physical boundary /
initial conditions or similar.
OK, thank you. I will think about it more.
Best regards,
Dmitry
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