Boundary Gradient Extrapolation
 

Hello! I'm new to OF and to this forum, so any help would be really appreciated.

I've got a question about the fixedGradient boundary condition (I) and one on BCs in general (II):


I) Is it possible to set the gradient's value to be extrapolated from the interior field?



II) How can I know what options (eg:uniform, nonuniform fields, their values, etc.) are available for each BC? Pretty much, how can I know what I can or cannot use in each case?



Many thanks!


Edit: I used the fixedFluxPressure boundary condition and that solved my problem.