# Can fluent track a single (large) particle?

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 December 14, 2007, 03:31 Can fluent track a single (large) particle? #1 Wei Guest   Posts: n/a 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

 December 16, 2007, 20:38 Re: Can fluent track a single (large) particle? #2 racheal Guest   Posts: n/a u may wanna look into 'DPM' which is discrete phase modelling. the particle can be track using a Lagrangian reference frame. hope it helps!

 December 16, 2007, 21:56 Re: Can fluent track a single (large) particle? #3 Wei Guest   Posts: n/a Thanks so much!

 December 17, 2007, 16:42 Re: Can fluent track a single (large) particle? #4 Jens Guest   Posts: n/a 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

 December 17, 2007, 18:53 Re: Can fluent track a single (large) particle? #5 Wei Guest   Posts: n/a 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?

 December 17, 2007, 22:13 Re: Can fluent track a single (large) particle? #6 Jens Guest   Posts: n/a 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

 December 17, 2007, 23:05 Re: Can fluent track a single (large) particle? #7 Wei Guest   Posts: n/a 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

 December 17, 2007, 23:12 Re: Can fluent track a single (large) particle? #8 Jens Guest   Posts: n/a 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

 December 18, 2007, 11:43 Re: Can fluent track a single (large) particle? #9 rana Guest   Posts: n/a 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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