Here is a brief results I got by trying to make the Spalart-Allmaras turbulence model converge for a 3d geometry(disk). At iteration=500, we can see that from the result of velocity U that its look really symmetrical. But at around iter=800, something seems happening (behind the disk on the left portion(or top)) and seems to go toward another solution. By looking at the results at iter=1500 for instance, its clear that it become asymmetrical. We know that from the nature of the flow, there is a von Karman effect happening at a certain level of Re number. But, is that possible to reach a state of convergence for that type of geometry in RANS showing a symmetrical velocity field? The Re number is Re=24 500 (reference: diameter of the disk) or Re=7 950 (reference: thickness of the disk). Thank you for your insight.