[Creg]

As the title says.



I am running a 2D turbulent, unsteady simulation of a simple cylinder as a test case using a 2nd order dual time stepping method and after a large number of iterations in the problem doesnt seem to be dispaying any unsteady flow characteristics.


Is this transient behaviour to be expected initially?


Thanks in advance

[pcg]

What unsteady phenomena are you expecting to capture?
You will not see turbulence eddies with a URANS simulation...
Another possibility is that your timestep is too large for what you are simulating (vortex shedding?) and so everything get's damped.

[Creg]

I was expecting to see vortex shredding, but instead i just obtain a fully developed, constant wake behind the cylinder.


I will try decreasing the timestep to see if this will show signs of vortexes.


Thank you