> There are various other options to transfer quadrature point data in
> problems where one classically has an evolution equation for an internal
> variable that is satisfied at the level of the quadrature point (e.g.
> return mapping algorithms in plasticity). I would be keen to help with
> these once you need them.

And Andrew is the person to go to with these sort of questions :-)

Just for completeness (and in order to leave this in the mailing list 
archives): When you have internal variables and want to get them from one mesh 
to the next, the natural way to do this would be
- to expand these variables that are only defined at quadrature points to
  a FE field that is defined everywhere
- move this field by interpolation to the next mesh
- restrict the field again to quadrature points on individual cells

There are functions and classes for each of these steps:
- FETools::compute_projection_from_quadrature_points_matrix
- SolutionTransfer
- FETools::compute_interpolation_to_quadrature_points_matrix

Hope this helps!
W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/
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