Hi thanks for replying. Appreciate it. Actually in both instances (when the pipe wall was meshed with hex cells and later re-meshed with tet cells) the sand block (green color block) covering the pipe wall was meshed with tet cells. So , maybe the sand block and pipe wall synced better when both were meshed with tet cells after re-meshing?

The skewness was slightly better for hex mesh (obviously since its structured) compared to tet mesh. But what do you mean by resolution? I do not see it in the mesh metric list under statistics.