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Forum: OpenFOAM Running, Solving & CFD

June 9, 2005, 05:53

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

Given that your geometry is qu

Given that your geometry is quite assymetric you probably won't need to perturb the initial conditions. However, I would strongly recommend you improve and refine the mesh particularly in the wake...

Forum: OpenFOAM Running, Solving & CFD

June 8, 2005, 19:26

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

Your mesh is not 2D, it's 2 ce

Your mesh is not 2D, it's 2 cells thick with empty patches on the front and back which allows nearly all the flow to "leak out" through those boundaries rendering the simulation totally incorrect. ...

Forum: OpenFOAM Running, Solving & CFD

June 8, 2005, 17:01

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

What happened when you perturb

What happened when you perturbed the solution to break symmetry?

Forum: OpenFOAM Running, Solving & CFD

June 8, 2005, 12:01

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

I am not surprised you get a s

I am not surprised you get a symmetric and steady solution using upwind spatial differencing, why did you choose such a low-order scheme? Why not use linear (central-differencing)?

Forum: OpenFOAM Running, Solving & CFD

June 8, 2005, 10:36

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

At Re=200 you do not need LES

At Re=200 you do not need LES and running in 2D is probably OK but you might want to check if you are likely to get 3D structures at this Re.

If your mesh and initial conditions are symmetric...

Forum: OpenFOAM Running, Solving & CFD

June 8, 2005, 09:27

Replies: 15

Karman vortex street

Views: 8,154

Posted By henry

What Reynolds number do you wa

What Reynolds number do you want to run at?

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