Cell type is tetra10

dolfinx
1

Hello everyone, greetings!
I recently installed FEniCS.In my work ,I convert .msh file to xdmf format,which is readable by FEniCS.
However, the cell type is ‘tetra10’.
The following code was used to convert a mesh from .msh format to xdmf format.
meshio.write(“mesh.xdmf”,meshio.Mesh(points = msh.points,cells = {‘tetra10’:msh.cells_dict[‘tetra10’]}))
After that，I use the following code to read ‘mesh.xdmf’

with XDMFFile(“mesh.xdmf”) as infile :
infile.read(mesh)
error message :Unable to recognise cell type,Unknown value “tetrahedron_10”.

Which step should be taken to correct this error

2

You Need to use dolfinx to be able to use second order tetrahedrons in your mesh

3

Thank you for your instructions
Is it possible to convert a second-order mesh to a first-order mesh？
Can I have some tutorials？

4

There is, if you read your mesh in with meshio, you can remove the cell connectivity corresponding to the higher order nodes. If you look at cell_dict of tet10, lets call it cells, cells[:,:4] should remove all higher order data.

1 Like
5

Thank you for your reply.
I will follow your instructions.
Thank you again for your reply.