From Gerris

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A GfsVariableTracer is an advected scalar quantity which can also change in time due to user-defined source terms.

The syntax in parameter files is:

[ GfsVariable ] {
  cfl = 0.8
  gradient = gfs_center_van_leer_gradient
  scheme = godunov

where the parameter block is optional. The syntax and meaning of the parameters is described in GfsAdvectionParams.


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