[Nek5000-users] User defined boundary conditions from internal plane

[nek5000-users at lists.mcs.anl.gov]

Dear All,

I would like to impose boundary conditions (in userbc) with velocity
values coming from a 2D plane in the same 3D domain being simulated (a
channel). For example, having two channels on top of each other, how can
I extract planar/cross-section values from the top channel (set with
periodic boundary conditions in the streamwise direction) and impose
them as "v" bc conditions in the bottom channel (set with v as inlet and O
(outflow))?

What I cannot understand is how to extract the values from a certain
y-z plane to impose them as bc in userbc (assuming the element distribution
is
the same in both cases).

Regards,
jp
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