[Forrest]

I have a pipe with a square hole (cut out of the pipes side) that I would like to mesh in Gambit. I have simplified the problem by using the symmetry of the domain. I have three volumes that will eventually be meshed: (1) the interior volume of the pipe, (2) the volume of the hole, and (3) the volume around the pipe. I have already successfully meshed the volume of the hole in the pipe as seen in Image 1 (the orange mesh in the photos). I am trying to mesh the shaded face in Image 2. I want to use hexahedral elements with the map scheme on this face, but Gambit says that the face is not a mapable region and uses the submap scheme to generate the mesh shown in Image 3. I want a nice non-skewed mesh because I'm going to use the Cooper scheme to mesh the outer volume. Is it the inner mesh that messing up my face mesh? Is there anyway that I can fix this or is there a better approach to meshing my domain than splitting it into three volumes and meshing each one separately? Thanks in advance!