Generate a mesh for a boundary region

Select the previously defined boundary name in the meshing setup tree.
Specify a Target maximum element size in the selected units.
(Optional) Select to Optimize based on area
Click the Generate Mesh button. The Meshing Options dialog opens.
Select the finite element shape and other options you wish the meshing engine to use.
Click OK to generate a mesh for the selected boundary.
The mesh is displayed in the Graphics window.