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How to Mix AIR and WATER

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Old   March 24, 2012, 07:28
Default How to Mix AIR and WATER
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Alvise
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Hi all, I'm e beginner with FLUENT.. I need to konow how to set up Fluent to mix air and water in a pipe with 2 different intlet that converge into one outlet. What I have to do?
Thank in advance!
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Old   March 24, 2012, 11:27
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hiŁ¬
1. import your mesh in Fluent .
2. in the object tree ,double-click models>muliphae-off.
3. choose mixture and number of eulerian phase is set to 2 in the dialog box.
Okay,good luck !
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Old   March 24, 2012, 13:43
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Thanks for your replay! But in boundary condition for intlet water and intlet air
Which option i must select to define if it s water or air?
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Old   March 25, 2012, 04:24
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define the same,but u should choose a different material.
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Old   March 25, 2012, 10:46
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Ok! But if i set phase: air for air intlet and respectly for water and mixture for other parts of my geometry, whith k-e models for turbolence the programm diverges at 10-15 th step.. How it s wrong?
Thanks for your time!
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Old   March 25, 2012, 10:53
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sorry,i dont know what your mean , could u post some screenshots?
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Old   March 25, 2012, 10:55
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with more detail
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Old   March 25, 2012, 11:21
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Ok I'm not at home.. so I hope this is enough:




but if you want more tell me
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Old   March 26, 2012, 02:19
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The image is compressed,which is so small .i can't see anything .
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Old   March 26, 2012, 10:44
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Ok tell me all options you wanna see.
I set:

Models->MultiPhase: Mixture (2 Eulerian..)
Models-> Viscous Model: k-epsilon (2 equations)

For boundary condition all set to wall except for: water intlet (velocity intlet), air intlet (pressure intlet) and outlet (pressure outlet)
but if i set in the boundary condition pannel a different option in the phase menu ex: phase 1 (air) instead of mixture most option don't appear in the edit menu:
http://www.freeimagehosting.net/73gq5

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Old   March 28, 2012, 12:40
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maybe this can be useful to help me:

My setting:







this is what pannel print:
Quote:
writing rp variables ... Done.
writing domain variables ... Done.
writing solid (type fluid) (mixture) ... Done.
writing air_int (type velocity-inlet) (mixture) ... Done.
writing water_int (type velocity-inlet) (mixture) ... Done.
writing interior-solid (type interior) (mixture) ... Done.
writing outlet (type pressure-outlet) (mixture) ... Done.
writing tube_water (type wall) (mixture) ... Done.
writing tube_air (type wall) (mixture) ... Done.
writing mixing_tube (type wall) (mixture) ... Done.
writing tume_mix (type wall) (mixture) ... Done.
writing tume_mix (type wall) (water) ... Done.
writing mixing_tube (type wall) (water) ... Done.
writing tube_air (type wall) (water) ... Done.
writing tube_water (type wall) (water) ... Done.
writing outlet (type pressure-outlet) (water) ... Done.
writing interior-solid (type interior) (water) ... Done.
writing water_int (type velocity-inlet) (water) ... Done.
writing air_int (type velocity-inlet) (water) ... Done.
writing solid (type fluid) (water) ... Done.
writing tume_mix (type wall) (air) ... Done.
writing mixing_tube (type wall) (air) ... Done.
writing tube_air (type wall) (air) ... Done.
writing tube_water (type wall) (air) ... Done.
writing outlet (type pressure-outlet) (air) ... Done.
writing interior-solid (type interior) (air) ... Done.
writing water_int (type velocity-inlet) (air) ... Done.
writing air_int (type velocity-inlet) (air) ... Done.
writing solid (type fluid) (air) ... Done.
writing zones map name-id ... Done

iter continuity x-velocity y-velocity z-velocity nut vf-water time/iter
1 1.0000e+00 8.0679e-03 7.4581e-03 9.1414e-03 1.6030e-01 7.5561e-03 0:02:26 99
2 1.0000e+00 3.2011e-03 3.2540e-03 3.2137e-03 1.1005e-01 4.6166e-03 0:02:15 98
3 1.0000e+00 1.6270e-01 1.0897e-01 1.1031e-01 4.4047e-02 5.1906e-02 0:02:26 97
4 7.0261e-01 6.3532e-02 3.4774e-02 3.4205e-02 2.7371e-02 4.2526e-02 0:02:15 96
5 6.1547e-01 4.3818e-02 2.6968e-02 2.5426e-02 1.8258e-02 4.4974e-02 0:02:06 95
6 7.2239e-01 4.7185e-02 2.7330e-02 2.6915e-02 1.4750e-02 5.3023e-02 0:02:17 94
7 1.3012e+00 6.1805e-02 2.8103e-02 2.8259e-02 1.5582e-02 7.3358e-02 0:02:07 93

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 31 cells
8 8.2346e+01 1.0233e+00 2.6506e-01 2.1635e-01 4.4897e-02 3.6242e-01 0:01:59 92

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 1334 cells
9 3.8345e+07 1.3439e+00 2.3447e-01 1.7753e-01 1.6061e+00 4.6655e-01 0:01:52 91

turbulent viscosity limited to viscosity ratio of 1.000000e+05 in 13544 cells
10 4.7525e+21 9.0219e-01 2.4496e-01 3.1374e-01 6.6087e-01 3.3101e-01 0:02:05 90

reversed flow in 60 faces on pressure-outlet 7.

Error: Divergence detected in AMG solver: nut
Error Object: #f

Interrupting...
Done.
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