[dolphink]

hello to cfd community,
newbie, and I would like your help,
I have create an unstructured rectangular mesh (2D) which includes one line at the perimeter. I would like to split this line to four lines; each for each side: north, west, south, east. The format of the mesh is .msh and .mesh. I used gmsh to create the initial mesh, and mmg2d library to improve the quality of elements.
Please, does anyone knows any open source tool, or could suggest a way to make the split? I tried gmsh but it does not work; and I assume because I do not have points at the corner of the rectangular,
any help is more than welcome,
thank you,
k.