On 05/31/2017 01:31 PM, 'Seyed Ali Mohseni' via deal.II User Group wrote:
Dear Thomas,
I already run the example with uniform mesh, hence global refinement
with 0 refinement cycles.
The problem is, a specimen with 100 or 1000 elements is difficult to
check due to the terminal output being flooded.
This I understand, but you could write everything into a file ...
I could just output the result for one element, but then wheres the
difference.
See below.
Don't you ever do some simple FE patch examples?
Never. Because simply the theory of finite elements tell you that the
discretization error is so huge
that any result is nearly meaningless.
If I am interested in stress values or the stress tensor, but I am not
sure if this
will help you or if you are interested, is to compute typical quantities
of interest.
That is not only a point-wise stress, but for example a line integral:
\int_{part of boundary} \sigma\cdot n \ds.
Or indeed you compute the stress in a specific point in the domain
but really using more than one element.
Many examples and benchmarks for elasticity and plasticity and also
quantities
of interest (goal functionals) are given in the book:
http://eu.wiley.com/WileyCDA/WileyTitle/productCd-0471496502.html
For instance two examples from this book with point values of stresses
(e.g., \sigma_yy),
again on more than one element, are provided in the deal-DOpElib
library, see pages 42 - 45 on
http://wwwopt.mathematik.tu-darmstadt.de/dopelib/description_full.pdf
Best Thomas
Kind regards,
S. A. Mohseni
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Dr. Thomas Wick
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Centre de Mathematiques Appliquees (CMAP)
Ecole Polytechnique
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