Raul:
Exactly, I would like to use what my DataPostprocessor computes in other parts
of the programme.
This is not the right approach. DataPostprocess is used to put derived
quantities into output files, not to compute data that can then be used in
other parts of the program. For what you want to do, you need to compute these
derived quantities at each quadrature point whenever you need it -- that's
exactly what step-15 does, for example.
In my postprocessor, I compute stresses and principal stresses for all
quadrature points (to give you the context, I am using quad elements with 4
quadrature points. The stress is constant for each cell/element
This is unrelated to your actual question, but it's worth pointing out that it
is not true that the stress is constant. It *is* constant on triangles if you
use linear elements because then the gradient of the solution is constant. But
on quadrilaterals, the gradient of the solution is *not* constant, and so the
stress is not constant on each cell in general unless your solution happens to
be globally linear.
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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