On Thu, Nov 10, 2016 at 1:42 PM, Salazar De Troya, Miguel <
salazardet...@llnl.gov> wrote:

> I see. Do you have a reference or example on how this combination is put
> together?
>

systems_of_equations_ex2 and 3 solve the incompressible Navier-Stokes
equations using a Q2-Q1 mixed formulation on a mesh of Quad9 elements.

So the pressure variable lives only at the vertices of these elements, and
the mid-edge and center nodes have no pressure dofs on them.

-- 
John
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