High Reynolds Number flow over Circular Cylinder

The black circle is a circular cylinder in cross section. Wind of 45 m/s blows around it. Initially there are stationary vortices in the wake(region behind the cylinder). Imbalace strikes and the vortices start shedding alternatively. Simulation: Large Eddy Simulation (LES). Software: OpenFOAM.

Category:

Science & Technology

Tags:

• CFD
• openfoam
• cylinder
• vortex shedding
• vortices
• reynolds number
• prapanj
• LES
• large eddy
• von karman
• vortex street
• velocity magnitude

[ddygu]

Have you looked at the force coefficients compared to experimental? What Re are you considering?

[prapanjgr]

yup I have looked at the force coefficients. They were ok, and atleast intuitive where not ok. I am considering Re close to 10^7

[JoeBrock28]

This seems under resolved... how big is the mesh that you are using?

[ryansnider]

this makes me miss college :(

[prapanjgr]

@Dadj0 Of course it is better to try 3D with LES and that is why the above simulation is 3D!!! What you see is just a slice of the 3D domain.

[prapanjgr]

@Dadj0 Of course it is better to try 3D with LES and that is why the above simulation is 3D!!! What you see is just a slice of the 3D domain.

[Dadj0]

@brianjpetersen it is better to try 3D with LES/DES/DNS

[YTRusUser]

@prapanjgr

Given Re=10^7 you should get fully developed turbulence downstream the cylinder with no regular vortex shedding. It's interesting what the Mach number was...

[lovecraft22]

Is that a finite or infinite cylinder? At what angle does separation occur?

[brianjpetersen]

Hi prapanjgr,

Very cool animation. I am learning OpenFOAM and would like to do a similar calculation for unsteady 2D incompressible flow normal to a flat plate using LES. Unfortunately, I haven't found too much direction online.

I'm sort of at a loss for how to begin using the LES solver to do this. Could you please point me in the right direction?

Many thanks,

Brian