Results for unsteady simulations ( Re = 200 )

Gambit mesh generation

FIDAP file

The Database and FDPOST results files are saved under /hsm/users/lwang/MEx81-2002/cylinder

Parameter settings:
Incoming velocity = 1 cm/s
Cylinder diameter = 1 cm
Fluid Density = 1 g/cm^3
Viscosity = 0.005 g/(cm.s)

Run for 801 time steps with a fixed time step size of 0.20
Total solution time on single node processor (Gershwin) = 36419 s or 10 hours

Vorticity at the node point 7024 (about one dimater behind the cylinder at centerline.)



Vorticity at t=0.2



Vorticity at t=30.6



Vorticity at t=60.2



Vorticity at t=90.6



Vorticity at t=91.4



Vorticity at t=92.2



Vorticity at t=93.0



Vorticity at t=93.8



Shedding frequency 

The period for the oscillations, T = 5.30 dimensionless time units.

Therefore the Strouhal number is: D/(UT) = 0.19

This compares well with experimental value of 0.17 (e.g., J.A. Roberson and C.T. Crowe,
Engineering Fluid Mechanics, 6th ed., pp. 436).

Conclusion: The shedding frequency is reasonablly simulated.