<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'>To All;<br><br>What is the method used to generate a mesh for a periodic BC?<br><br>Specifically, my problem is 180 degree periodic about the Z axis, so the surface mesh at Y=0 needs to be mirrored; for each node (x, y=0, z) there would be a matching node (-x, y=0, z).<br><br>Of course, I'd like to do this with arbitrary rotation or arbitrary translation. If I could select my plane, do a TRI mesh, copy the plane to the new position along with it's accompanying mesh and follow that with a TET mesh operation, I think I'd have exactly what I was looking for. The issue is whether meshes can be copied within GMSH, or whether I have to generate the TRI mesh, use a separate program to duplicate it and follow that with a 3-D TET generation.<br><br>Regards,<br> ...Dan<br></div></body></html>