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September 3, 2013, 05:00 |
Pressure driven flow in vertical pipe
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#1 |
Member
Hale
Join Date: May 2013
Posts: 53
Rep Power: 13 |
Hi to all,
I have a tank connected to a vertical pipe. The tank is full of water and the sides of the tank have the following boundary condition Inlet U: zeroGradient; p: zeroGradient; alpha1: fixedValue uniform 1; The water in the tank would then fall into the vertical pipe. The outlet of the pipe has the following boundary condition outlet U: zeroGradient; p: fixedValue uniform -250; alpha1: zeroGradient; The upper side of the tank is then open to the atmosphere with following boundary condition atmosphere U: inletOutlet; p: totalPressure (p0=0); alpha1: zeroGradient; In this way I want the water to fall down based on the pressure difference between outlet and inlet. But with the mentioned boundary conditions the water moves upward and the simulation crashes after some seconds. I guess that the hydrostatic pressure at the outlet causes problems, since there is a positiv hydrostatic pressure corresponding to the water in the pipe. Am I choosing wrong boundary conditions? I really appreciate any help and idea. NB. I'm using interFoam. |
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September 4, 2013, 14:47 |
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#2 |
Senior Member
Nima Samkhaniani
Join Date: Sep 2009
Location: Tehran, Iran
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well whats your OpenFOAM version ?
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September 4, 2013, 18:44 |
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#3 |
Member
Hale
Join Date: May 2013
Posts: 53
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It's version 2.0.1
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September 5, 2013, 01:53 |
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#4 |
Senior Member
Nima Samkhaniani
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then you should assign p_rgh not p! p will be calculated then through solving problem whats your p_rgh configurations?
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September 5, 2013, 05:15 |
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#5 | |
Member
Hale
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Quote:
By the way do you know how to change the values for Sp and Su. In the page below, post #7 decribes that the problem with unbounded alpha1 can be solved by changing Sp and Su but I have no idea how and where to change them. Do you know that? http://www.cfd-online.com/Forums/ope...tml#post449990 Thanks for your time |
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September 5, 2013, 10:17 |
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#6 | ||
Senior Member
Nima Samkhaniani
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Quote:
Quote:
Code:
solvers/multiphase/interFoam and solvers/multiphase/compressibleInterFoam
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September 13, 2013, 09:16 |
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#7 |
Member
Hale
Join Date: May 2013
Posts: 53
Rep Power: 13 |
Thanks a lot Nima. I have solved the problem.
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