Karman Vortex 2d- laminar
 

I am trying to simulate air flow around the cylinder in 2d.. The flow is laminar (Re= 100) and I am using pimpleFoam.



I am not sure what to use for my BCs for the patches... I have used slip for the cylinder in this simulation. I think it is wrong.


Second, the flow does not look exactly correct right?

Any help would be appreciated.

Here is a video of the simulation!


https://drive.google.com/drive/folde...vr?usp=sharing


A photo is also uploaded!



Thanks!

Dear qutadah,

can you provide more information on the case? Did you try higher Reynolds numbers?

Hello,


I have used instead pimpleFoam (kindly read the problem description again, I have uploaded a video of the simulation).


Thanks ! I actually only tried it for Re 100, and as described the flow shouldnt be oscillating at the downstream of the cylinder at that Reynolds number right?


Thanks!

Why you use 'slip' for a highly viscous problem?

I cannot see any issue in the flowfield visualisation picture you show. (I did not view the video). It is oscillating, as flow over a bluff body should. You should use more quantitative way to verify if it is working or not. There will be a lot of literature for drag coefficient or other metrics for flow over a cylinder.


To echo what Santiago is implying: unless there is a key detail in your problem setup or objectives that you have excluded, I would recommend using noSlip on the cylinder walls. Outlet should be zeroGradient for velocity (or inletOutlet for improved stability). Outlet for pressure should probably be fixedValue or totalPressure.