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-   -   granular flow (http://www.cfd-online.com/Forums/fluent/41769-granular-flow.html)

Lydia July 18, 2006 12:07

granular flow
 
Hi, Ive got the following problem: I want to simulate the discharge of a hopper. I use the eulerian model with 2 phases (air and sand). I use also a 2d geometry designed and meshed with gambit. For BC I choose velocity inlet and pressure outlet. The flow should be gravity driven. The problem is, that the continuity does not converge!! Even if I try to get a solution with the unsteady simulation and realy small time steps. So what could be the problem here? And how can I make sure that just a wanted mass flow rate is taken out over the outlet? Because the real problem is solved with a screwconveyor. You see I'm new and not realy familiar with fluent yet. So please help me!!!

thanks

Albert Franco July 19, 2006 02:01

Re: granular flow
 
Hello Lydia

I'm a beginner so I don't know if I can help you but what I've seen is that there is a tutorial in www.fluentusers.com called using the eulerian multiphase model for Granular Flow. I did it and the two phases are water and sand. If you think it can help you have a look at it.


Lydia July 19, 2006 05:55

Re: granular flow
 
Thank you, I allready did this tutorial. But the difference is that there is no sand being discharged, just mixed. The first problem is that I do not get the solution to be converged, and the second one that i don't know how to specify the mass flow of sand at the outlet! I think both has something to do with my BC.



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