# Mathematical Treatment of massless particles, DPM

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 April 20, 2014, 11:56 Mathematical Treatment of massless particles, DPM #1 New Member   Join Date: Apr 2014 Posts: 2 Rep Power: 0 Hi CFD-online forums!! First time poster, long time lurker, I have been reading this forum for years, but until now I decided to make an account. After the short Hi... here's my issue. I already read the whole theory guide regarding DPM, but I can't find how particles that you specify in the injection as "massless" are mathematically dealth with. I can only assume that their tracking comes from the integration of the velocity field of the fluid in question. Could anybody explain a bit / point me in the right direction to understand this? What I am trying to do is determine the residence time distribution of water in a pipe / arrange of pipes (I am doing this an an exercise for a more complex design, but I wanted to give it a shot with only pipes), but I can't completely understand what I am mathematically doing. TL;DR: In the DPM model, how are massless particles mathematically dealth with? Any help will be highly appreciated!! Cheers!!!

 Tags dpm, massless, particles, tracking

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