Von Karman vortex street (2D)

The motivation was to create an animation demonstrating the Von Karman vortex street effect with airflow over a 2D cylinder cross section

The computational domain (wind tunnel area) will be 2.5 m tall by 10 m long and will contain a 0.1 m diameter cylinder which is 2.5 m from the front of the tunnel and 1 m from the bottom of the tunnel.

the boundary conditions include a 25 m/s velocity inlet, pressure outlet condition, and no-slip at the wall.

this analysis assumes incompressible flow and is evaluated under the transient time condition.

the following models where used:

• Multiphase - off

• Energy - off

• Viscous - SST k-omega

• Radiation - off

• Heat Exchanger - off

• Species - off

• Discrete Phase - off

• Solidification and Melting - off

• Acoustics - off

• Structure - off

• Potential/Li-ion Battery - off

Air was assumed to have a constant density and constant viscosity

The Solution Methods used the following parameters

• Pressure-Velocity Coupling - SIMPLE Scheme

• Spatial Discretization

  • Least Square Cell Based Gradient

  • Second Order Pressure

  • Second Order Upwind Momentum

  • Second Order Upwind Turbulent Kinetic Energy

  • Second Order Upwind Specific Dissipation Rate

• Second Order Implicit Transient Formulation

The Calculation was then run for 500 timesteps (0.001 s intervals) with max 20 iterations per timestep. The results for this calculation are shown bellow.