nonlinear source term

[rahafrouz]

Hi!
In a diffusion term process, does the source term should only be a linear term of diffusion variable (phi)? My diffusion simulation has a kind of wasting term and a noise term, which are not linear and I was wondering how should I implement that.
thank you.

[wd15]

@rahafrouz, no the source term does not have to be linear. You can make the source terms functions of "phi". As long as "phi" is a CellVariable the source terms will be updated during the time steps and sweeps. See the following for an example of how to deal with non-linear source terms:

http://www.ctcms.nist.gov/fipy/examples/phase/generated/examples.phase.simple.html