.
(14)
Finite element
formulation
The 2.5D FEM element attached with the screw channel depth (H =R b − R s) is employed to
discretize the problem domain, as shown in Figure 2. Particular elements
such as notch and pin mixing elements can be expressed directly by
changing the wall thickness, H , attached to the element.
In the 2.5 D FEM element, the pressure and coordinates are interpolated
using a shape function