Dear list, I have an issue with a simple script, (here https://gist.github.com/4037850 ).
When I choose flux=0 boundary conditions on both size of this 1D diffusion problem, I don't think the results are correct. Physically this describes something like the absorption and emission of light. With the flux=0 constraints I would expect the value of phi (in this case electron density) to build up inside the volume because it cannot escape. However, the fipy solution for this case doesn't look physical. I'm probably missing something! Best regards, Dan. PS. Latex version of the equations http://imgur.com/mCcX2 .
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