CASE II Stress in a plate with a hole
For this case, the grid must match in the edges. The edges are defined as arcs. Some changes in the values are done to see how the mesh is altered.
The grid

Original generated grid

Initial values for undeformed semicircular shape

Values for a deformed semicircular shape

Original grid in green and modified in red
Results

Original sigma

Sigma for the deformed mesh

Original D magnitude

D magnitude for the deformed mesh