  Primary instability of the lid-driven flow in a cube is studied by a
comprehensive linear stability approach. Two cases, in which the lid moves
parallel to the cube sidewall or parallel to the diagonal plane, are
considered. The SIMPLE procedure is applied for evaluation of the Krylov
vectors needed for application of the Newton and Arnoldi iteration methods. The
finite volume grid is gradually refined from 1003 to 2563 nodes. The
computations result in the grid convergent values of the critical Reynolds
number and oscillation frequency. Patterns of the most unstable perturbation
are reported. Finally, some new arguments supporting the assumption that the
centrifugal mechanism triggers instability in both cases are given.
