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September 27, 2007, 10:05 |
Hi everybody.
I'm trying to s
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New Member
joao carneiro
Join Date: Mar 2009
Posts: 3
Rep Power: 17 |
Hi everybody.
I'm trying to solve a simple case to test the twoPhaseEulerFoam solver. The problem is that of the demixing of bubbles flowing through a channel dispersed in water. But I have some problem. After a couple of time steps, reversed flow occurs at the outlet boundary. I assume there is some problem with the BC. Is there anybody who had a similar problem? I set the boundary condition as follows: Ua boundaryField { inlet { type fixedValue; value nonuniform List<vector> 18 ( (0 0 0) (0.0319305 0 0) (0.0635875 0 0) (0.0943479 0 0) (0.123419 0 0) (0.1498 0 0) (0.172243 0 0) (0.189193 0 0) (0.19873 0 0) (0.19873 0 0) (0.189193 0 0) (0.172243 0 0) (0.1498 0 0) (0.123419 0 0) (0.0943479 0 0) (0.0635875 0 0) (0.0319305 0 0) (7.21645e-17 0 0) ) ; } outlet { type zeroGradient; } lowerWall { type slip; } upperwall { type slip; } defaultFaces { type empty; } } Ub boundaryField { inlet { type fixedValue; value nonuniform List<vector> 18 ( (0 0 0) (0.0319305 0 0) (0.0635875 0 0) (0.0943479 0 0) (0.123419 0 0) (0.1498 0 0) (0.172243 0 0) (0.189193 0 0) (0.19873 0 0) (0.19873 0 0) (0.189193 0 0) (0.172243 0 0) (0.1498 0 0) (0.123419 0 0) (0.0943479 0 0) (0.0635875 0 0) (0.0319305 0 0) (7.21645e-17 0 0) ) ; } outlet { type zeroGradient; } lowerWall { type fixedValue; value uniform (0 0 0); } upperwall { type fixedValue; value uniform (0 0 0); } defaultFaces { type empty; } } alpha boundaryField { inlet { type fixedValue; value uniform 0.0257; } outlet { type zeroGradient; } lowerWall { type zeroGradient; } upperwall { type zeroGradient; } defaultFaces { type empty; } } I also tried to change the BC to "calculated" but unfortunately with no success. I get the following message: --> FOAM FATAL IO ERROR : keyword value is undefined in dictionary "/nfs/home/lee/OpenFOAM/lee-1.4.1/run/tutorials/twoPhaseEulerFoam/channelFlow_in ternal/0/alpha::outlet" file: /nfs/home/lee/OpenFOAM/lee-1.4.1/run/tutorials/twoPhaseEulerFoam/channelFlow_int ernal/0/alpha::outlet from line 42 to line 42. From function dictionary::lookupEntry(const word& keyword) const in file db/dictionary/dictionary.C at line 146. FOAM exiting Thanks for any hint. Joao. |
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