Hi Kurt, Glad the documentation is complete on this point. Cheers, Spencer. On 25 Oct 2017, at 22:22, Kurt Sansom <kayarre@gmail.com<mailto:kayarre@gmail.com>> wrote: I figured it out. Didn't read down far enough in the documentation. for 3-D models the hierarchy is vertices -> edges -> faces -> elements edges are defined by two vertices. Faces are defined by three or more edges. For three-dimensional expansions, the element is defined by a list of faces. ~Kurt On Wed, Oct 25, 2017 at 10:43 AM, Kurt Sansom <kayarre@gmail.com<mailto:kayarre@gmail.com>> wrote: The documentation mentions mesh edges being required for 2D and 3D, but how are they used and is there some implicit connection between them and Elements? I would assume the only connection is the vertex Ids should match, but it's unclear to me if I might be missing something there. Regards, ~Kurt -- Kurt Sansom -- Kurt Sansom _______________________________________________ Nektar-users mailing list Nektar-users@imperial.ac.uk<mailto:Nektar-users@imperial.ac.uk> https://mailman.ic.ac.uk/mailman/listinfo/nektar-users Spencer Sherwin FREng, FRAeS Head, Aerodynamics, Professor of Computational Fluid Mechanics, Department of Aeronautics, Imperial College London South Kensington Campus, London, SW7 2AZ, UK s.sherwin@imperial.ac.uk<mailto:s.sherwin@imperial.ac.uk> +44 (0)20 7594 5052 http://www.imperial.ac.uk/people/s.sherwin/