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Thomas
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Post subject: Continuity and mass conservation?  Posted: Sat Oct 29, 2011 2:59 pm |
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Joined: Sat Oct 29, 2011 10:41 am
Posts: 3
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I am not an expert in solutions of the Navier-Stokes equation, but there is a strange behavior with conservation of masses. When I have a box with just a small opening facing against the flow direction, I get continous flow into the box without any chance of the flow to leave it somewhere. Like the fluid is flowing only into the box, but where does it go to?
See the pictures added here. You can clearly see, that the flow just goes into the box.
Some idea?
What about the 3rd dimension? Is the wind tunnel completely solved in 2D or are there assumptions in 3D?
Thomas
btw: Amazing great App!
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File comment: Flow into a box without exit.
Mass_Conservation_FlowIntoABox.jpg [ 36.67 KiB | Viewed 14872 times ]
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File comment: Flow Field only goes into the box.
Mass_Conservation_Flowfield.jpg [ 83.5 KiB | Viewed 14872 times ]
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Kravell
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Post subject: Re: Continuity and mass conservation? Posted: Sat Oct 29, 2011 11:07 pm |
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Joined: Sat Oct 08, 2011 4:18 pm
Posts: 10
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Hi,
The algorithm only works with two dimensions.
To be able to work in real-time on mobile hardware, the algorithm has to make some approximations, it cannot solve and compute a 100 % accurate solution. This results in non-physical behavior in some configurations, like the one you showed.
Such "hard" configurations are more complex than others to simulate, and would require too much time to solve correctly.
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Boxster
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Post subject: Re: Continuity and mass conservation? Posted: Fri Jan 17, 2014 2:11 am |
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Joined: Thu Jan 16, 2014 5:20 am
Posts: 3
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