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[Nguyen Van Dang <question156292@xxxxxxxxxxxxxxxxxxxxx>]

Question #156292 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/156292

    Status: Expired => Open

Nguyen Van Dang is still having a problem:
Hello,
I am solving two-dimensional Heat equation: du_dt = D*Laplace(u), (where D is discontinuous diffusion
coefficient) on a rectangle with a circular cell in the center. The diffusion coefficient in the cell is D2 and in the
remaining part is D1. Especially, there is one information at the interface is the permeability-alpha. For my problem, the flux condition at the interface is: D1*du1_dn = D2*du2_dn = alpha*(u2 - u1), where u2 is the function u defined on cell, u1 is the function u defined on the remaining part, n is the normal vector at the interface.

I already solved the interface problem without permeablity - alpha at
the interface on your Fenics. With body-fitted mesh, it worked well.
However, I don't know how to apply permeability to the interface.

Please give me some advices.

Many thanks in advance.

Nguyen Van Dang

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