Week 2 - Flow over a Cylinder.
Objectives
To simulate the flow over a cylinder and explain the phenemenon of Karman Vortex street.
Theory
Karman vortex street is a repeating pattern of swirling vortices, caused by a process called vortex shedding, responsible for the unsteady separation flow of a fluid around blunt bodies.
Geometry
Meshing
Results
Steady state
Transient State
Strouhal number = (frequency*Diameter)/Vel = (0.067*2) = 0.133
Part 2
For Re = 10
When Re =100
When Re=1000
Re=10000
Re=100000
Here, we can see that at lower Reynolds number, no vertices can be seen. When the reynolds number increases, the drag coefficient decreases while lift coefficient increases.
References