Assuming that you have compiled Nektar++ according to the compilation instructions, run the command
to generate the XML file.
EXPANSIONS
definition). In order to use this mesh, a CONDITIONS
section must be supplied
detailing the solver and parameters to use.
which generates an unstructured VTK file test.vtu
.
It is possible that, when the high-order information was inserted into the mesh by Gmsh
,
invalid elements are generated which self intersect. In this case, the Jacobian of the mapping
defining the curvature will have negative regions, which will generate warnings such as:
This tells you the element ID that is invalid, and the ID of the first vertex of the element. Whilst a resulting simulation may run, the results may not be valid because of this problem, or excessively large amounts of time may be needed to solve the resulting linear system.