Any prediction of pressing is based on a transient calculation. The melt undergoes deformations in time in the same manner as a simple squeeze flow. The process conditions (such as mold or plug motion) may also vary with time.

In terms of geometry, 2D planar, axisymmetric, and 3D modeling can be employed in the Ansys Polyflow calculation. Such a representation enables a calculation through the thickness, and therefore it is possible to predict the local shear effects, as well as the elongation effects. For the former, 2D modeling can certainly make sense from a computational point of view.