LES Starting Conditions

Bob

Hi, I'm wanting to do an LES simulation of flow around a circular cylinder using CFX5.6. Due to the small time steps required for the simulation I was wondering if the following would be a valid option. Start my simulation with a much larger time step - say 2 orders of magnitude, then once I have something representing a steady oscilation of my forces on the cylinder, then drop the timestep back down to the lower desirable level (1e-4sec). The other option I thought of was to use a restart from a transient ke model which I ran and then just use the small time step right from the start. Are there any issues I should be wary about if I adopt either approach ? Cheers for any help Bob