[ankgupta8um]

Hello,

I would like to implement a non-uniform gradient boundary condition for a passive scalar. Any ideas om how can I specify varying flux on a boundary ?? I looked at the documentation but didn't find any standard boundary condition that can be used to specify varying fluxes.

Thanks,
Ankur

Any of the standard boundary conditions can be used to specify varying values as well as uniform ones -- the process for doing that is that you specify a boundary field instead of a single number for the relevant boundary value.

(For an idea of what a boundary field looks like in a file, have a look at something like the U values at an outflow boundary condition for something other than the initial timestep.)

I don't know what the best way to set up such a field for a specific profile is, though.