The coarse model contains 12 quadratric serendipity elements. The fine model contains 48 linear elements.
In both the coarse and the fine models, the position 'basis' for the element type is specified. This gives the discretisation points and shape functions which are used to calculate the geometric shape of the elements.
All element basis information is optional. The position 'basis' makes the FEA model a complete shape model.
Symmetry boundary conditions are applied to edges AE and CE in the model. Two different approaches to the specification of boundary conditions have been used in order to demonstrate the capabilities of AP 209.
In the coarse model, the boundary conditions are specified directly node by node. In the fine model, the boundary conditions are applied to the geometric curves. Nodes and element edges in the finite element model are then associated with these curves.
It would be natural to apply the contraints to the topological entity edge_curve, but part 104 only allows geometry entities and not topology entities to be referenced.