Ozgur_ 
December 4, 2010 17:17 
Hey everyone,
I wanted to ask a couple of stuff related to unsteady modelling: I'm doing the exact same thing you discussed; I first get a converged steadystate solution, then I run it unsteady. Here's what happens though:
 I'm analyzing the wake of a 3D cylinder in cross flow. Since for most Re numbers (including mine) the wake is unsteady, so the contour plots of variables oscillate inside the wake.
The funny thing is, for the first 90  100 time steps, the wake oscillates, but after that point, and even when the residuals go down and flatten out at low levels, the wake oscillation disappears. The wake looks symmetric, like the average, mean version of all the oscillations.
Any idea why this is happening? Could it be related to the size of the time step and/or the number of pseudotime iterations at each time step? Or could it be related to the boundary conditions?
Cheers,
Ozgur
