[qutadah.r]

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!

[ngbidi]

Dear qutadah,

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

[qutadah.r]

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!

[Santiago]

Originally Posted by qutadah.r

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.

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

[joshwilliams]

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.