6. Summary of results

As for the items:

DKT:

The result is better with a finer mesh (1366 knots) which leads to an error < 1.5%.

MEC3QU9H:

The result is acceptable with relatively few items (compared to DKT). By significantly increasing the number of elements (60 instead of 32), the error is < 1.3%.

MEC3TR7H:

Unsatisfactory result even with a fine mesh leading to a large overall number of nodes for MEC3TR7H (777 for MEC3TR7H compared to 209 for DKT and 121 for MEC3QU9H). To achieve an error of less than 2.9%, this requires a very large number of nodes (1071). It seems to be recognized that this element is not as good as MEC3QU9H.