Discussion Forum

I'm trying to model a modulating point source of light in a homogenous scattering and absorbing media. I'm using the coefficient form of the PDE equation. When I enter the time varying equation (sin(omega*t)) for the source into the point setting weak term, there's no photon diffusion into the media. When I enter the equation into the source term of the PDE subdomain setting, the photons appear to propagate, however, the concentration of photons at any two points are perfectly in phase (there should be a time delay between two points as the photons diffuse in time).

I thought the source term in the subdomain was for sources scattered throughout in the media.

Can anyone help clarify what's going on?

Thanks,
Dan