[Getdp] Periodic Boundary Conditions

[Raymond Michaux]

Dear all,

I'am trying to use the "Periodic Boundary Conditions" in a simplified model of permanent magnet 
linear motor, according to an information given by Christophe Geuzaine on the same topic (see mailing 
list June 2005).
In order to check the method, I used a model with magnet centered on the teeth, I used the vector 
potential formulation and I ran the same problem with two sets of  boundary conditions :
    1. A Dirichlet a = 0 on three sides
    2. A Dirichlet a = 0 on upper border and periodic conditions between left and right side
For both cases, there was no error reported.
As the geometry is a symmetrical one, both methods should be equivalent but the calculation results are
obviously different.

Could you help me. The files are attached for tests. The file ".don" contains the main dimensions 
and is included in both ".geo" and ".pro". For the second case, please modify ".don" and ".pro" as 
indicated inside the files.

Thanks
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