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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 ] [ GfsDiffusion ] Phi

where Phi is the optional name of an existing variable. If Phi is specified the equation solved is not a standard diffusion equation anymore but takes the form

tV = ∇.μ∇Φ

(i.e. by default Phi = V).

GfsSourceDiffusion 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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