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["B. Emek Abali" <question153567@xxxxxxxxxxxxxxxxxxxxx>]

Question #153567 on DOLFIN changed:
https://answers.launchpad.net/dolfin/+question/153567

B. Emek Abali posted a new comment:
You solve variables of: pressure AND velocities

so You need to define Dirichlet or Neumann for both of them.

If You won't define anything then You are automatically defining
Neumann=0 for that variable, in your case try to define at least zero in
top-bottom direction for velocities or use long enough channel.

If You see sth like a chess board, try to go with time, perturbing the system slowly, an example You may find in my Website under Computational Reality
http://www.lkm.tu-berlin.de/menue/mitarbeiter_sprechstunden/b_emek_abali_msc/

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