Can icoFoam capture von Karman vortices at Laminar Re numbers?

B_R_Khan · March 18, 2021, 07:38

Hi!

I am trying to study flow over cylinder in OpenFoam at different Reynold numbers. I have run simulation using icoFoam at Re 1000 and 100 with different end times. According to literature, von karman vortices begin to form at Re 90-100 and until Re 40, symmetrical and attached vortices are formed behind cylinder. Now the problem is, in both of my simulations using icoFoam at Re 1000 and Re 100, attached symmetrical vortices are formed behind cylinder. How do I get boundary separation of un-symmetrical vortices behind cylinder using icoFoam at Re 100? Can icoFoam correctly capture von karman vortices at laminar Re numbers?

I am using U=1m/s , dia of cylinder is 1 m with nu of 0.001. I kept the upper and lower boundaries as patches and not walls.

Would appreciate any guidance
Thanks!

Edit: I was able to capture von karman vortices just by increasing end time

Tobi · June 21, 2021, 09:14

IcoFoam should be able to capture that.

Edgar Alejandro Martínez · September 30, 2021, 20:17

I made a tutorial in OpenFOAM. You can download the files located in GitHub: https://www.youtube.com/watch?v=A1YQ9eZQFcg

March 18, 2021, 07:38	Can icoFoam capture von Karman vortices at Laminar Re numbers?	#1
B_R_Khan Member Bushra Rasheed Join Date: Dec 2020 Posts: 97 Rep Power: 5	Hi! I am trying to study flow over cylinder in OpenFoam at different Reynold numbers. I have run simulation using icoFoam at Re 1000 and 100 with different end times. According to literature, von karman vortices begin to form at Re 90-100 and until Re 40, symmetrical and attached vortices are formed behind cylinder. Now the problem is, in both of my simulations using icoFoam at Re 1000 and Re 100, attached symmetrical vortices are formed behind cylinder. How do I get boundary separation of un-symmetrical vortices behind cylinder using icoFoam at Re 100? Can icoFoam correctly capture von karman vortices at laminar Re numbers? I am using U=1m/s , dia of cylinder is 1 m with nu of 0.001. I kept the upper and lower boundaries as patches and not walls. Would appreciate any guidance Thanks! Edit: I was able to capture von karman vortices just by increasing end time Edgar Alejandro Martínez likes this. Last edited by B_R_Khan; March 19, 2021 at 01:52.

June 21, 2021, 09:14		#2
Tobi Super Moderator Tobias Holzmann Join Date: Oct 2010 Location: Bad Wörishofen Posts: 2,711 Blog Entries: 6 Rep Power: 52	IcoFoam should be able to capture that. B_R_Khan likes this. __________________ Keep foaming, Tobias Holzmann

September 30, 2021, 20:17		#3
Edgar Alejandro Martínez New Member Edgar Alejandro Martínez Ojeda Join Date: Jul 2019 Posts: 20 Rep Power: 7	I made a tutorial in OpenFOAM. You can download the files located in GitHub: https://www.youtube.com/watch?v=A1YQ9eZQFcg B_R_Khan likes this.

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