External flow over a cylinder

Re = ρ*U_inlet*D/μ

D = cylinder diameter = 0.1

μ = dynamic viscosity=1.8205

ρ = Fluid density=1.2047

For initial inlet velocity of 1m/s

Re=1.2047*1*0.1/1.8205=0.06617

Length of domain = 2.3 m

Simulation end time is a little over 2 times the flow thorugh time.

Velocity:

Pressure:

for 20% increment in Re, v=1.2 m/s

Velocity:

Pressure:

for 40% increment in Re, v=1.4 m/s

Velocity:

Pressure:

for 100% increment in Re, v=2 m/s

Length of domain ~ 4 m

(Better to see this one on a new window)

Velocity:

Pressure:

Observations:

One can clearly observe how does the velocity and pressure profiles develops over the time around the cylinder. Higher the Re, longer the wake length.

In the last velocity video, vortex shedding can be observed to originate.