That is a big bold topic title but here is the project that seems to back it up.
EDIT 10-30-2019 : And if those numerics still do not converge, then simply Relax P to 0.75 and Relax U to 0.25 …
The default relax for those is P0.3 and U0.7. REALLY VERY SIMPLE, try relaxing first… (even for HEX meshes…)
EDIT: Yes they converge great to stable results but are giving me accuracy headaches in a NACA0012 verification project that I am working on. Stay tuned for updated numerics soon if I can more closely verify the NACA0012
PLEASE try these out and report back here on your difficult TETforCFD mesh, CFD convergence problems
EDIT: I just thought the topic was necessary to quickly put ‘out there’ as I do not want people getting discouraged when trying TETforCFD meshes with DEFAULT numerics. (I almost gave up and I have a lot of perseverance )