PRES is a uniform pressure, acting along the normal of the element, but in the opposite direction, this can raise many errors or give unexpected results if the normals are not oriented as we think they are! For this kind of study I would rather use FORCE_COQUE, but for learning from the mistakes let’s try with F3.
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bian222 - (no access) - beginning_with_Code_Aster_JPAubry_20131206.pdf, p121
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