Assuming that you have compiled Nektar++ according to the compilation instructions, run the command
to generate the XML file.
EXPANSIONSdefinition). In order to use this mesh, a
CONDITIONSsection must be supplied detailing the solver and parameters to use.
which generates an unstructured VTK file
It is possible that, when the high-order information was inserted into the mesh by
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.