Simple icoFoam simulation gone wrong

rieuk · March 4, 2010, 01:46

Hey people,

I've uploaded my simple icoFoam case file ( http://www.megaupload.com/?d=D43CKXKX ) and it runs pretty quickly. I'm simulating flow over an ellipse. I expect to see the vortex street behind the ellipse but am only seeing what looks like a steady state solution. Why is icoFoam giving a steady-state solution?

rieuk · March 5, 2010, 02:31

Could someone please take a gander at this one - I'm sure it's a very simple thing I'm overlooking that a more experienced OF user would be able to spot instantly.

Thanks.

farbfilm · March 5, 2010, 03:07

You don't use a turbulence model! So, you can't get a vortex street!
If your ReNumber is so high that it is in the turbulent region, you should use a turbulence model!!

rieuk · March 5, 2010, 03:24

Yes, but should still be able to observe the roll up of the boundary layer and the formation of shedding vortices with icoFoam. Why can't I observe this? Is my boundary layer not resolved well enough, or the P and U solvers I'm using are wrong??

March 4, 2010, 01:46	Simple icoFoam simulation gone wrong	#1
rieuk Senior Member Pavan Join Date: May 2009 Location: Melbourne Posts: 101 Rep Power: 17	Hey people, I've uploaded my simple icoFoam case file ( http://www.megaupload.com/?d=D43CKXKX ) and it runs pretty quickly. I'm simulating flow over an ellipse. I expect to see the vortex street behind the ellipse but am only seeing what looks like a steady state solution. Why is icoFoam giving a steady-state solution?

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March 5, 2010, 02:31		#2
rieuk Senior Member Pavan Join Date: May 2009 Location: Melbourne Posts: 101 Rep Power: 17	Could someone please take a gander at this one - I'm sure it's a very simple thing I'm overlooking that a more experienced OF user would be able to spot instantly. Thanks.

March 5, 2010, 03:07		#3
farbfilm Member Michael Join Date: Mar 2009 Posts: 48 Rep Power: 17	You don't use a turbulence model! So, you can't get a vortex street! If your ReNumber is so high that it is in the turbulent region, you should use a turbulence model!!

March 5, 2010, 03:24		#4
rieuk Senior Member Pavan Join Date: May 2009 Location: Melbourne Posts: 101 Rep Power: 17	Yes, but should still be able to observe the roll up of the boundary layer and the formation of shedding vortices with icoFoam. Why can't I observe this? Is my boundary layer not resolved well enough, or the P and U solvers I'm using are wrong??