Rajat,
I am updating my mesh after every time-increment. So, cell->vertex(v)
contains the current coordinates of the mesh. I know the coordinates of
the cell (and whole mesh) at t = 0, I wanted
to know how I can initialize the fe_values object wrt to the coordinates
of the cell at t = 0.
If possible, this will enable me to use
fe_values->get_function_gradients() and fe_values->shape_grad() to get
the gradients wrt to reference mesh.
You can't. The FEValues classes only consider the mesh as it is right
now, not how it was a while ago.
But you could consider leaving the mesh as it is (i.e., in reference
coordinates) and using MappingQEulerian to describe the displacement.
Then, if you use an FEValues without a mapping, you get everything with
regard to the original (reference) configuration. If you use an FEValues
with the mapping, you get the current configuration.
Best
W.
--
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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