https://github.com/ExCALIBUR-NEPTUNE/nektar-driftplane/pull/2/files is how to do fluxes

Implementation seems to work - #220

There is one remaining test that isn't quite right. Otherwise basically done.

@oparry-ukaea are you happy for me to close this down?

Not yet - still need to resolve the issue with the energy test.

Owen currently working on the energy tests (and implicit timestepping for 2D and 3D separate PRs)

2Din3D works. Will do 3D in 3D after NESO becomes a library.

This runs but there is still an issue with the energy conservation.

@oparry-ukaea can we close this?

Still haven't resolved the energy conservation discrepancy, but the branch is getting a long way behind - probably worth merging it and creating an issue to follow up later.

Let's merge the hw3d branch and open a branch to check conservation.

Closed in favour of #263