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# Perio1: Periodic Boundary Condition

This very simple example demonstrates the effect of applying periodic boundary condition, which forces the field potential to be the same on opposite sides of the model.

**Problem Type:**

Plane problem of DC magnetics.

**Geometry:**

Two regions, *A* and *B*, have the same shape, volume loading and are surrounded by Dirichlet boundary condition, which does not allow the field to penetrate outside. Region *B* is also subdivided into *B*_{1} and *B*_{2}, and the periodic boundary condition is specified on two sides, which makes these regions the continuation of each other. As a result, field distribution in both *A* and *B* must be equivalent.

**Results:**

This example also demonstrates that the mesh on the periodic boundary is not necessarily the same - please notice that the mesh spacing settings in four corners of the model are all different!

There are 2 problems *Perio1.pbm* and *Perio1odd.pbm* in the archive. *Perio1odd.pbm* is almost the same, but for one difference: odd periodic condition is applied, which forces the field potential to be opposite on two sides of the region.

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