Seyed,
Generally, in FEM you number elements like in the below picture:
<https://lh3.googleusercontent.com/-0n-HlF1EsRs/WLBEmN34aaI/AAAAAAAAAGU/GlK9R9OqDJ8FSTLKGXeaI85eU6pdV3MkwCLcB/s1600/System.png>
No, that is patently wrong. First, you are only considering rectangular
domains subdivided into rectangular cells. Second, you think that
because there is a "simple" numbering that that is what codes "should
do". Both of these assumptions are wrong. How, for example, should a
code number these cells:
https://raw.githubusercontent.com/dealii/dealii/master/doc/doxygen/images/distributed_mesh_1.png
https://raw.githubusercontent.com/dealii/dealii/master/doc/doxygen/images/hyper_shell_96_cut.png
Starting a sentence with "Generally, in FEM you number elements..." is
generally wrong.
I am a bit confused since it is a rather easy task which should not be
such a big "deal" in deal.II.
Because it's *not* easy. It's only easy if you consider simple situation
like yours. But if you want to do complicated things, they generally
turn out to be complicated.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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