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Can fluent track a single (large) particle?

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Old   December 14, 2007, 02:31
Default Can fluent track a single (large) particle?
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Wei
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if the particle's size is large compared to the duct, can fluent simulation this flow performance and track the particle's position? Which part should I look at firstly in the fluent help?

Thanks

Wei
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Old   December 16, 2007, 19:38
Default Re: Can fluent track a single (large) particle?
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racheal
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u may wanna look into 'DPM' which is discrete phase modelling. the particle can be track using a Lagrangian reference frame. hope it helps!
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Old   December 16, 2007, 20:56
Default Re: Can fluent track a single (large) particle?
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Wei
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Thanks so much!

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Old   December 17, 2007, 15:42
Default Re: Can fluent track a single (large) particle?
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Jens
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The proper question here is, what do you mean with large. I suspect you are talking about a particle that spans several computational cells, in which case the DPM method will not really do the job.

Jens
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Old   December 17, 2007, 17:53
Default Re: Can fluent track a single (large) particle?
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Wei
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Thanks.

In fact, I want to track a "single" large particle whose diameter is about 1/100 - 1/10 of the tube's diameter. I think maybe I have to remesh during the simulation. I don't know whether DPM will work for this scenario Or I have to combine it with other technique in the FLUENT?
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Old   December 17, 2007, 21:13
Default Re: Can fluent track a single (large) particle?
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Jens
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Wei,

For a particle that spans several cell volumes, you will need to modify the momentum equations to account for the full or partial blockage by the solid. I am not sure that remeshing as the particle moves along your duct is necessarily the best approach. You will also need to solve a separate equation of motion to determine where the particle(s) will move. Another challenge will be to account for wall collisions. If your particle can be assumed to be spherical that will help alot. DPM will be of little use, because it always assumes that particle source terms (mass, momentum, energy) relate to a single cell, namely the one the particle currently resides in. Your best bet is a UDF that modifies continuum source terms.

/Jens
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Old   December 17, 2007, 22:05
Default Re: Can fluent track a single (large) particle?
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Wei
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Hi, Jens,

Thanks so much!

If the particle is larger than several cells' volume, as you suggested, I'd better rewrite the control equation and take those cells as solid (maybe partially), right? By this method, I think we can take the acts from solid to liquid into consideration, but how to deal with the liquid to solid actions? I mean, how to move that particle?

I have some experiences on the pure flow simulation, but it's my first time to deal with the particle Would you please recommend some papers on the two problem you mentioned in the last message?

Thanks again!

Wei
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Old   December 17, 2007, 22:12
Default Re: Can fluent track a single (large) particle?
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Jens
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As regards the solid particle motion, you "simply" need to calculate the resultant pressure force from the surrounding fluid and then apply Newton's second law. I am afraid I don't really know of any references to share with you, just trying to outline a general procedure. I wish you good luck, this should be ver doable but far from straightforward.

/Jens
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Old   December 18, 2007, 10:43
Default Re: Can fluent track a single (large) particle?
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rana
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hi,

try the new add-on MPM model of Fluent. it will help you. contact ur support for more details. i have no experience of using it

best wishes.
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