A Derivative-Free Mesh Optimization Algorithm for Mesh Quality Improvement and Untangling

Table 1

The test mesh configurations.

Mesh name	Number of vertices	Number of elements	Number of inverted elements
Cylinder	1,196	2,240	0
Bar	4,167	7,232	0
Hydrocephalus	4,311	8,166	13
Airfoil	5,252	10,200	42