how to refine mesh along the certerline
 

dear frineds:
I want to generate tri mesh in a square cavity. I need the tri element along the center lind of the cavity is very fine. in icemcfd 12, how to set this property.
I found the creat density, but it seems it only works for 3d problem.
regards

Create the 3d mesh along with the density box at the desired location and then delete the 3d mesh and shell meshing of other five surfaces. Keep the surface mesh you require.