Issue when exporting .fld in Hdf5 format to .vtu
When exporting 3DH1D checkpoint file written in Hdf5 format to .vtu, the following problem occurs:
- If Lz>=1, working correctly
- If Lz<1, then a single 2D slice is exported and can be viewed in Paraview.
The attached channel case from the IncNavierStokesSolver tests will reproduce the issue.