GfsBcFlather
From Gerris
GfsBcFlather is used to impose "Flather" conditions on the boundaries of a GfsOcean simulation.
The syntax in parameter files is:
GfsBcFlather U [ GfsFunction ] H P [ GfsFunction ]
where U is the name of the normal component of the velocity, H is the name of the depth variable, P the pressure/elevation variable. The first GfsFunction defines the target normal velocity value and the second GfsFunction the target value of the pressure/elevation.

