Thanks for the response. The mesh is largely tetrahedral (I believe it's patch conforming - whatever the default is), but a significant chunk (going to guess 20%) is also swept hexahedral.nA conformal mesh is needed here, so parallel meshing is not an option.nBased on that math, a single 350GB machine should be sufficient for around a billion cells. What then do you suggest the issue is? Is WB Meshing equipped to handle meshes this large?n