A Novel Virtual Node Hexahedral Element with Exact Integration and Octree Meshing

Figure 9

Patch tests for VHE elements: (a) 2 elements test with 1 inner node, (b) 3 elements test with 2 inner nodes, (c) 4 elements test with 4 inner nodes, and (d) 6 elements test with 7 inner nodes.

(a)

(b)

(c)

(d)