Reversed single vortex test, using DG.

Level set advection, using Discontinues Galerkian finite element method. Polynomial is of order n=3 and number of triangular element (unstructured) K=3572. No re-initialization is performed. At time t=2 seconds, it will return back to its initial position.( Time shown in title is not the exact time. It is frame number times time step and i plot it after a jump of 10 time steps.)