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problem with eulerian scheme

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Old   August 4, 2014, 15:32
Default problem with eulerian scheme
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zain
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hi ,
i'm trying to simulate airflow reactor using where the reactor are filled with water and air is injected in the almost middle of the column , here is my setting and problem description
model>euler>implicit
turbulence >k-epsilon>dispersed
i tried many cases for interaction , also solvers but it keep giving me revers flow !!
the boundary conditions for
air ( dispersed phase ) u=0.6m/s (Secondary phase )
air volume fraction = 1 cause only air is injected
no outlet in the system
also i used marked to inject the air with (0 volume fraction in the cell zone)

any suggestion plz
what is the wrong with my setting ?
which gives a reversed flow ??
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Old   August 6, 2014, 04:56
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Cees Haringa
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Dear Zain,

How exactly are you simulating a reactor that has an inlet but no outlets? That doesn't work, right?

Where do you get the reversed flow? I guess for the air inlet your boundary condition is a velocity inlet - so I guess it is not there?

Best,
Cees
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Old   August 9, 2014, 10:15
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zain
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hi Cees
thanks for your reply
the revers flow happened in few cells after entrance
the reactor have only gas in and gas out and liquid are contained in the reactor
i figure out my mistake it was with the turbulence model i used dispersed model for multiphase and that mean the turbulence will be in the secondary phase and partially in the primary phase while i should use mixture where the turbulence happen in both phases by this setting the effect of gas phase will make the liquid move in the right direction .
thank you for your attention

cheers !
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