Time-dependent diffusivity

[nreuge]

Dear Dr. Zwicker,

I'm considering about using your package for my work involving modeling the diffusion of chloride ions into concretes.
I've a important question: is it possible using py-pde with a time-dependent diffusivity D=D(t), the time-dependence law being known? (in concretes, the diffusity progressively decreases over the years...)
Or would I have to chain several simulations, the one after the other with D constant but different, to take into account this time-dependency? I'd like to avoid this method, it wouldn't be really convenient...

Congratulations for your work!

Any help would be appreciated, than you!

[david-zwicker]

Yes, a time-dependent diffusivity should not pose any problems. It's not currently implemented in the DiffusionPDE class, but you can simply write a diffusion equation with a time-dependent diffusivity using the PDE class.