Isentropic vortex on unstructured grid

[cpraveen]

On unstructured grid, there is some bug which causes vortex to distort when it crosses the boundary.

This does not happen with cartesian grid, whether generated inside deal.II or in gmsh.

[cpraveen]

@JR-Khan can you test this. Try both cartesian and unstructured grid. See inside grid.geo file for how to get these two types of grids.

[JR-Khan]

Here are some outputs from different case. Please have a look

https://www.dropbox.com/scl/fo/mz1q30iccotzmxgvr2ia8/ACsmk1UecXqbzwOoAJ1G1QA?rlkey=nhylkpb2ydnp82ap9tsazo5mr&st=pi0otjog&dl=0

[cpraveen]

If you are computing vorticity within visit, then it is not very accurate and at partition boundaries, it will be still less accurate. This is because visit will do some finite differencing.

Do you observe errors in primary quantities when crossing partition boundaries ?

[JR-Khan]

No.

[cpraveen]

This issue is still unresolved here, and may be same one we are seeing in cgsem when we use gmsh grids. Do you recall what was the problem in this dg code ?