3D problem (sphere) Navier-Stokes

[dokken]

@emathi

 # This line needs to get cell data from what ever the markers have been called in the vtk file.
    # Expore

As written here, you need to explore mesh.cell_data to find the appropriate markers.

Please note that you need to store boundary markers in a separate mesh, as shown in:

What is wrong with my mesh?

Using a slightly different conversion syntax, I can reproduce your domain with XDMF. import meshio import numpy as np def create_mesh(mesh: meshio.Mesh, cell_type: str, data_name: str = "name_to_read", prune_z: bool = False): cells = mesh.get_cells_type(cell_type) cell_data = mesh.get_cell_data("gmsh:physical", cell_type) points = mesh.points[:, :2] if prune_z else mesh.points out_mesh = meshio.Mesh(points=points, cells={cell_type: cells}, cell_data={ …