[Paraview] Need node numbers and element node connectivity

[Chaitanya Raj Goyal]

Dear All,

I run a FEM simulation in FEniCS to obtain two output files. One is of .vtu
format and the other is of .xdmf format.

However, because I do parallel processing, in the former case, I actually
obtain different .vtu files for different processors, a single .pvtu file
and  a single .pvd file. In the latter case, I obtain a single .xdmf and a
.h5 file.

Both simulations are 2D, and if you open the spreadsheet format in
Paraview, you see something like this:


​
I need to do some post processing on the solution vectors 'u' and 'v'. You
may also refer to them as 'ux' and 'uy' OR "f_18_1" and "f_18_2".
Therefore, I need to import it in MATLAB. To do that, in ParaView, I first
go to menu >> save data >> save file in CSV format for all points. The csv
file I am looking at gives me 6 columns - Coordinate X, Y, Z, Solution ux,
uy, uz. Here Z and uz are zero vectors. How can I also get the node number
for the given node coordinates, and how can I get the elemental nodal
connectivity? Any help is greatly appreciated!

Thanks in advance!
Chaitanya
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