It says that your generated mesh has some vertices, edges, or else that does not belong to any cell. I suggest you have a look at the generated mesh to see if you can spot such an artifact, and then figure out how to drive gmsh to not have such a thing. ________________________________ From: firedrake-bounces@imperial.ac.uk <firedrake-bounces@imperial.ac.uk> on behalf of Francis Poulin <fpoulin@uwaterloo.ca> Sent: 02 November 2017 19:38:34 To: firedrake Subject: [firedrake] problems with importing a mesh Hello, I have created a mesh of an oceanic basin that I have triangulated with gmsh. Finally! I am very excited to solve for the wind-driven gyre solutions with this new mesh (as I discussed back in March at the workshop), unfortunately, when I try to import the mesh I get the following: mesh = Mesh("test3.msh") ValueError: Provided mesh has some entities not reachable by traversing cells (maybe rogue vertices?) Any ideas as to what I might have done wrong and how I can fix this? Cheers, Francis ------------------ Francis Poulin Associate Dean, Undergraduate Studies Associate Professor Department of Applied Mathematics University of Waterloo email: fpoulin@uwaterloo.ca Web: https://uwaterloo.ca/poulin-research-group/ Telephone: +1 519 888 4567 x32637