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how to simulate particle jumping out from a water flume cavity

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Old   May 31, 2015, 05:21
Default how to simulate particle jumping out from a water flume cavity
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Juste
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hi

i have done some experiments in a water flume which has a rectangular cavity (please see attached pic).

during my experiment, i put a small particle in the cavity, and then the particle automatically jumps out of the cavity, perhaps due to velocity fluctuations and eddies in the cavity.

till now i have been able to match the velocity profiles from the experiment to the fluent simulation, but i am not able to simulate this jumping of particles out of the cavity.

for turbulence, i am using k-epsilon model with steady solver and i got converged results.

i tried using DPM for modeling the particle, but the particle never jumps out in fluent when particle density = 1.2 g/cc, although it jumps out when density < water density; the latter is of course for obvious reasons. but that means my DPM modeling is correct, isn't it?

so how do i simulate this particle jumping out?

1. do i need to use other turbulence models, not k-epsilon? if yes, then which one.
2. do i need to use transient solver, not steady? if so, why?
3. i have tried steady and unsteady DPM both, but none of them helps..still which DPM should i use - steady or unsteady?

problem with unsteady DPM is that it doesn't give the particle trajectory.

please let me know if u have any suggestions.

thanks a lot
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Old   May 31, 2015, 22:15
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Wai Phyo Kyaw
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Please try CFDEM. www.cfdem.com

With regards
Phyo
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Old   June 1, 2015, 01:29
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hey thanks for suggesting cfdem..
but it takes lot of time to learn a new software
i have already spent some time with fluent, so was expecting it can be done with fluent too.

anyway, any idea on how to simulate the phenomenon.
do i need to use some other turbulence model not k-epsilon, transient, steady, anything ?

thanks for ur help :-)
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