The next step consists in defining the required polarizations. Here, we will consider that the polarization is uniform in each section of the transformer. Therefore, we will apply the polarization named Cartesian.
The polarization in the input section is oriented in the thickness direction, while that of the output section is oriented along the length of the transformer, such that each section of the transformer operates in the so-called d33 mode.
The definition of polarizations is done by using local coordinate systems, also called Local Axes. To understand how the polarization is defined with respect to local axes, please read the help files about the ATILA-GiD interface (under the ATILA | Help menu).
Select the Volume tab of the conditions window, then Polarization from the drop-down list. Select Local-Axes | Define in order to create a polarization.

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