# Easy calculation fails

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 October 31, 2012, 10:48 Easy calculation fails #1 New Member   Join Date: Oct 2012 Posts: 1 Rep Power: 0 Hello guys, I am having a problem with CFD. I am trying to figure out what boundary conditions I have to use if I want to get a propper image of air flowing through a tube. In the tube I added a aperture to raise the preassure at the front and get a higher speed at the exit of my aperture. The boundary conditions I am using at the moment are: INPUT: speed: 10m/s pressure at the entrance: 0,2Bar = 20mBar excess hydrostatic pressure OUTPUT: I dont want to define any conditions for the area behind the aperture. Let's say I don't know anything about this area and I want my PC to solve this task/fiction of mine. I want him to show me what speed/pressure I would get at/behind my aperture, with this szenario of mine. The thing is, if I am not able to create these easy tasks and get propper answers, I will never be able to understand even more complexe structures. So that's why I want to understand the basics. I hope someone can help me with my problem. Thanks a lot in advance, Fluidguy

 January 4, 2013, 12:19 RE: Easy calculation fails #2 New Member   Matt Brown Join Date: Jan 2013 Posts: 17 Rep Power: 5 Can you clarify what you mean by 'proper image of air flowing through a tube'? Are we talking about velocity distribution, streamlines, pathlines, pressure distribution, etc? Can you post a screenshot or two of your geometry? I am not following your description. Thanks, Matt

 Tags aperture, basic, tube

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