Cylinder flow - vortex problems

RJ1331 · December 12, 2014, 09:01

Hi, I'm Ray

I'm trying to simulate the Cylinder flow like below URL

< URL : http://www.youtube.com/watch?v=hj-COdWOafU >

But, The simulation i made does not have vortex like that.

I had changed values of U, V, Nu so many times .. but still same result.

Anyone can give advice?

hereby, please see the attachment for this simulation.

The folder attached has folders 0, constant, system.

Best regards,

Ray

lovecraft22 · December 12, 2014, 18:07

What is your Re?

infikamal5 · December 13, 2014, 21:02

1) Your Re should be higher than Re > 47
2) Create a very small deformation in your external domain, Instead of perfect Rectangle external domain.

Martin Hegedus · December 15, 2014, 20:46

Why would anyone want to do DES at an Re of 405? Also, note that the vorticity dissipates, which is incorrect. Possibly the numerical dissipation is too high, or the grid is expanding.

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December 12, 2014, 18:07		#2
lovecraft22 Senior Member lore Join Date: Mar 2010 Location: Italy Posts: 460 Rep Power: 18	What is your Re?

December 13, 2014, 21:02		#3
infikamal5 New Member KS5 Join Date: Mar 2012 Location: US Posts: 15 Rep Power: 14	1) Your Re should be higher than Re > 47 2) Create a very small deformation in your external domain, Instead of perfect Rectangle external domain.

December 15, 2014, 20:46		#4
Martin Hegedus Senior Member Martin Hegedus Join Date: Feb 2011 Posts: 500 Rep Power: 19	Why would anyone want to do DES at an Re of 405? Also, note that the vorticity dissipates, which is incorrect. Possibly the numerical dissipation is too high, or the grid is expanding.