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 dualshock December 4, 2012 08:16

Urgent: Need help with karman vortex using openfoam

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Hi guys,

I am a newbie at using openfoam and was recently requested to create a simulation of a flow over a cylinder with karman vortex behind the it and I have no idea how to begin. The geometry of the cylinder is shown below and the length of the no-slip wall on the top and bottom are both 15m. The height of the inlet and outlet are 5m. The inlet velocity of the fluid is 1m/s and the pressure at the outlet is 0 Pa. I would like to know how do I create the above geometry and which solver should I be using (potentialfoam or icofoam?). In addition what is the condition for karman vortex?

 immortality December 4, 2012 10:06

hi
top and bottom should be symmetryplane left surface inletoutlet and right zerogradient
if you want slip on cylinder must use potentialfoam and symmetryplane on cylinder.if no-slip use icoFoam and fixedValue on cylinder with value uniform (0 0 0).its easier to make mesh in fluent and enter to openfoam with fluentMeshToFoam in command shell.
if have any question tell me.

 jobito_2012 January 29, 2013 00:24

Hi !!

Quote:
 Originally Posted by dualshock (Post 395680) Hi guys, I am a newbie at using openfoam and was recently requested to create a simulation of a flow over a cylinder with karman vortex behind the it and I have no idea how to begin. The geometry of the cylinder is shown below and the length of the no-slip wall on the top and bottom are both 15m. The height of the inlet and outlet are 5m. The inlet velocity of the fluid is 1m/s and the pressure at the outlet is 0 Pa. I would like to know how do I create the above geometry and which solver should I be using (potentialfoam or icofoam?). In addition what is the condition for karman vortex?

I need to do the same problem, can you send me the file please...I´m learning OpenFoam...thanks!!

my mail is aguilera1623@mail.com :)

 JBeilke January 29, 2013 08:09

Here is a ready to run example where I used pimpleFoam. It contains a coarse and a fine grid created with GridPro. Have fun.

www.beilke-cfd.de/Karmann_OpenFoam.tar.gz

 jobito_2012 January 29, 2013 11:38

Ok! :)

Quote:
 Originally Posted by JBeilke (Post 404785) Here is a ready to run example where I used pimpleFoam. It contains a coarse and a fine grid created with GridPro. Have fun. www.beilke-cfd.de/Karmann_OpenFoam.tar.gz

Ok!! thanks a lot...I will review the files :)

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