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How to deal with two subdomains with different PDE parameters

 

Hi dolfin users

I am trying to use dolfin for the following simple
electrostatic problem:
- finding the electrostatic potential in a domain composed
 of two subdomains with different dielectric constants.
 This amounts to solving Laplace equation with appropriate
  BC's.

One thing that I cannot figure out how to do is to tell dolfin
that I have 2 subdomains and on the internal boundary between
these two domains, the normal derivative of the potential has
a discontinuity given by the difference between the dielectric
constants.
Could anyone give me a hint of how to approach this problem
with dolfin ? I am relatively unexperienced to FEM so a nice
reference would also be welcome.

Regards
Kristen



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