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GfsSourceDiffusionExplicit is the time-explicit version of GfsSourceDiffusion. Note that this means that the timestep will need to be smaller than the local diffusion timescale to ensure stability i.e.

Δt < Δx2

where Δx is the mesh size and μ the diffusion coefficient. Depending on the problem this can be very restrictive and the stable time-implicit scheme of GfsDiffusion could be used instead.

The syntax in parameter files is:

[ GfsSourceDiffusion ]


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