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Ansys CFX vs CFD for multiphase+particle

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Old   June 3, 2010, 08:30
Default Ansys CFX vs CFD for multiphase+particle
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didier
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Hello.
I posted this thread in the wrong forum, this time is the right one !

I want to simulate the behaviour of the water intake to a hydroelectric plant on Ansys.
It's a multiphase flow with 2 continuous fluid (air and water) and free surface model.
So far I've used CFX, no pb.

But now I want to inject sand and do particle tracking.
I got an error message in CFX because multiphase flow together with particle tracking is not supported...

So should I switch to CFD ? Will it be feasible and not too difficult (I'm a beginner on Ansys !).
or can I stay in CFX ? Then I guess I should give up particle transport morphology for sand.....

If some expert could help me make the right choice, that would be much appreciated.

Thanks in advance
Z
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Old   June 4, 2010, 03:58
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didier
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Ok, I'm trying to continue in CFX.
I don't really need to do particle tracking. Just need to see volume fraction in steady state of the sand in water.

So I defined water and air as continuous fluids (with free surface between them), and sand as dispersed solid.

Does anyone know what Reference density I should use for the 3 material.
In the tutorial for multiphase (air + water) I read to use density of air.
But in Tutorial for sand particle in water (butterfly valve example), I read to use density of water as ref. density of sand and water (well, they have no air, it makes sense).

But I'm just inbetween ! Can anyone help me on this ?

Thanks.

didier
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