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GfsSourceDiffusion is used to add diffusion to a scalar tracer (representing, for example, temperature or concentration).

The syntax in parameter files is:

[ GfsSourceScalar ] [ GfsFunction ]

where the GfsFunction defines the diffusion coefficient.

It can also be used to set a viscosity source term on each Cartesian vector component of the velocity, however when the viscosity is non-uniform GfsSourceViscosity should be used instead.


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