Hi Daniel,
In your script, you are solving an steady state problem. Add a transient
term, and preferably sweep to get the solution. Perhaps sth like this:
equation = (TransientTerm() == diffusion_term + source_term)
timestep = <your time step>
steps = 10
for step in range(steps)
res = 1.e6
phi.updateOld()
while res>1.e-5
res = equation.sweep(var = phi, dt = timestep)
Kind regards,
Ali
On Thu, 2012-11-08 at 19:02 +0900, Daniel Farrell wrote:
> 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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