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Dear all,

This is Silvia Ceccacci from Macquarie University, Sydney. I am a new PhD student in Mathematics and I have just started to use Nektar++ to perform 3D incompressible N-S simulations. 

I am exporting a mesh from gmsh and I am trying to simulate a flow around a sphere. So I would like to generate the 3D mesh within the main domain with the sphere taken out (see sphere_2.geo). I managed to generate the .msh file (see sphere_2.msh), using the command line

gmsh -3 -order 3 sphere_2.geo

but now I get an error (see error.png) when I issue

NekMesh sphere_2.msh sphere_2.xml

I am not sure what the error means and/or what am I doing wrong? Could you help me with this, please?

Any little help or suggestion would be greatly appreciated.

Thank you in advance.

Kind regards,
Silvia