unsteady,2D circular cylinder

Sheila

Hi all!

I'm simulating 2D circular cylinder for both steady and unsteady. Steady case results are good. Cd values from my simulation are close to several references.

The problem is unsteady case simulation. I've tried these procedures: 1. start the simulation direct for unsteady 2. use the steady result, change the solver to unsteady, and run the simulation

the results that I get have these patterns: 1. if I use previous steady results, I can't get the vortex shedding process. Maybe because the time step that I use was too large, but I use the formula that Fluent gave.

2. if I use unsteady direct simulation, the velocity contours are not symmetric.

Thank you