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Old   January 29, 2003, 20:54
Default Problem with DPM model
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cwflying
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Hi everyone,I am now using DPM modele to simulate particle movement in a hydrocyclone. In terms of hydrocyclone, it has one velocity inlet and two outflow outlets( I have set the flow weight already). First I simulate fluid flow in hydrocyclone using RSM modele( because it is strong swirling flow) then add particle injection at inlet,assuming particles having the same velocity with fluid flow at inlet, using DPM modele. The problem is: when I track particles, I find the particles only escape at inlet, not two outlets!

(two axisymetrical dimension,inlet velocity for example u=0,v=-0.2m/s, w=2m/s)
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Old   January 30, 2003, 03:56
Default Re: Problem with DPM model
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Jurgen
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Some ideas: are the outlets set to escape in Boundary Conditions? You can also specify the boundary at which the particles escape. I think that is done under Report-> Discrete Phase Model. Hope this helps, Jürgen
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Old   January 30, 2003, 05:43
Default Re: Problem with DPM model
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cwflying
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I have already set the escape boundary conditions at two outlets and inlet, the wall B.C is set to reflect.
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Old   January 30, 2003, 05:50
Default Re: Problem with DPM model
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dag
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Try setting your inlet face as reflect instead of escape. I would initially guess the centrifugal field is large enough to instantly move your particles out through the inlet before they enters the domain.

In addition Fluent has a bug when it comes 2-D acisymmetric particle tracking in cyclones (and probably other type of geometries), where particles lighter than the fluid move towards the wall. You can easily check if this is part of your problem with a 3-D calc of the same geometry (take a 5 deg rotational symmetric 3 D example of the same geometry).
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Old   January 30, 2003, 06:01
Default Re: Problem with DPM model
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cwflying
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Thank you, I have also tried setting inlet B.C to be reflect, but it still does not work. And in my case particle is about 2000kg/m~3, fuild flow is water.
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Old   January 31, 2003, 12:25
Default Re: Problem with DPM model
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bala
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Hi, First you solve for the continuous phase. After some iterations, just enable the DPM model and try.

Regards, bala
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