Maybe it seems easy, but it is a hard question for a new starter like me. I have already successfully meshed the objects into triangular grids(2D automesh). but when I checked the equivalence, I found out that there existed some free edges. and then I clicked on the button "equivalence". Then after a long time, it may have finished equivalence. But when I rechecked the free edges. There are still many free edges. What should I do? As I understand it, free edges means edges that are not shared with two triangles. So some nodes should be merged into one. I used to use Patran to mesh grids. What i have done is based on my experience of using patran. Thank you!