I follow your suggestion, and may go that route, but I was wondering if
it would be possible to define two active indices on a cell.
No. The active fe index is the unique index of the element of the
FECollection that is active on a given cell. It can only be one.
Ideally, I
would prefer the fluid and mesh motion to have separate FESystems.
That is a separate issue. It would be valid to construct your combined
FE in the following way (for the fluid, for example):
FESystem flow_variables (FE_Q(2), dim, // velocities
FE_Q(1), 1); // pressure
FESystem motion (FE_Q(1), dim);
FE_Nothing displacements (dim);
FESystem fe_for_flow_domain (displacement, 1,
flow_variables, 1,
motion, 1);
In other words, there is nothing wrong with having an FESystem of FESystems.
Best
W.
------------------------------------------------------------------------
Wolfgang Bangerth email: [email protected]
www: http://www.math.tamu.edu/~bangerth/
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