Problem partially solved:
I'm using a logarithmic discretization (first dr= 5e-04 and next dr increasing
as 1.05)(with internal radius= 0.00125, external radius=0.03) and,
for some unknown reason this create problems and wrong result with cylindrical
1D mesh. I tried using a uniform discretization (dr=5e-04 nx=58) and now the
result is correct.
However I need to use the logarithmic discr. so after some hours of sleep I'll
think about the reason.....
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