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problem with axis boudray and mixture flow

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Old   December 5, 2010, 03:13
Default problem with axis boudray and mixture flow
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hi every body
I want to model a bubble column so I use a symmetry boundary for my 3d model and axis for my 2d model.but the result are very unexpected. the velocity are higher near the wall boundary and I have back flow near symmetry and axis boundary and I have lower phase volume fraction near axis.
do you have any idea about these wrong results?
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