# Particle tracking using fluent 5

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 May 29, 2001, 10:52 Particle tracking using fluent 5 #1 John Beveridge Guest   Posts: n/a I am using fluent 5 to track particles down a 0.19m diameter pipe with a velocity of 0.6 m/s. Is there a limit to the size of particles I can accurately measure (i.e. 10% of diameter)? and do they have to be positioned at a certain distance away from the pipe wall (i.e. 0.5 diameter)? Any help in this matter would be most appreciated. Thanks, John

 May 30, 2001, 11:54 Re: Particle tracking using fluent 5 #2 rafi friend Guest   Posts: n/a i think one thing you must do is setting the inlet sources completely (from surface, or from file, single etc. read fluent manual). but you can guess if you specify particle inlet with diameter 0.5 mm and 0.4 mm away from pipe wall.

 June 4, 2001, 05:25 Re: Particle tracking using fluent 5 #3 John Beveridge Guest   Posts: n/a Thanks Rafi, but I am really after the maximum size that a particle can be - obviously a particle can't be modelled well if it is 99% of the diameter of the pipeline. So what is the biggest it can be, and still be moved to a reasonable degree?

 June 6, 2001, 09:08 Re: Particle tracking using fluent 5 #4 Althea Guest   Posts: n/a Hello John, Assuming that Lagrangian particle tracking is used (as per Fluent 4) then the volume fraction limit usually advised (in the papers I've read - sorry I have no references to hand) is about 12%. I would therefore translate this into a single particle with a diameter of less than 12% of the pipe diameter, or if several particles are simulated, the sum of their diameters should be less than 12% of the pipe diameter. As is always the case, it is useful to have some reliable experimental data (or even hand calcs.) of a similar type of system, with which to compare the CFD to check you are in the right ballpark. I hope this helps. Regards Althea

 June 6, 2001, 09:10 Re: Particle tracking using fluent 5 #5 John Beveridge Guest   Posts: n/a thanks for that! I appreciate your help in this matter

 June 13, 2001, 11:53 Re: Particle tracking using fluent 5 #6 HGG Guest   Posts: n/a Hi,Althea, If case is a converged-diverged pipe, do you mean the translated diameter should be less than 12% of diameter of samll section(throat of constricting part)? thanks

 June 14, 2001, 05:19 Re: Particle tracking using fluent 5 #7 Althea Guest   Posts: n/a Yes, that seems reasonable. Althea

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