Konstantine Kourbatski
Ansys Employee

to add to the previous comments:

1) central differencing scheme can be made available through the TUI command: solve set expert, and yes to Allow selection of all applicable discretization schemes?

2) QUICK is formally 3rd order accurate on hex (quad in 2D) meshes. On unstructured tets or polys it will revert back to the 2nd upwind