# Inconsistency in DPM concentration

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 November 15, 2012, 10:28 Inconsistency in DPM concentration #1 Member   Mat Join Date: Jan 2012 Posts: 41 Rep Power: 6 Dear all, I'm using the DPM model of FLUENT, with the following parameters : * unsteady * two-way coupling (but without resolving the flow equations. Thus, im only resolving the particles motion equation in a one way coupling approach) * inert particles (no mass, no heat, transfers) In this context, I was monitoring the DPM_CONCENTRATION average on a surface, and I saw some inconsistencies. Thus, I did a small test, by computing the total mass of particles in my domain (sum over all the cells of DPM_CONCENTRATION*CELL_VOLUME), and I get the following results : at injection : mtot = 5.44e-10 kg after 1s : mtot = 5.29e-10 kg after 3s : mtot = 4.72e-10 kg after 5s : mtot = 5.0e-10 kg What is happening ??? Ok there can be some numerical diffenrences, but not so much! There are no particles escaping (always the same number as initially), and I don't have any mass transfer. So, what did I miss ? Thanks a lot for your help ! Best, Mat

 April 27, 2013, 06:20 #2 Member   sajeesh Join Date: Feb 2013 Posts: 52 Rep Power: 5 [QUOTE=Mat_fr;392284]Dear all, Thus, I did a small test, by computing the total mass of particles in my domain (sum over all the cells of DPM_CONCENTRATION*CELL_VOLUME), and I get the following results : at injection : mtot = 5.44e-10 kg after 1s : mtot = 5.29e-10 kg sir how you r calculating this.....what is sum over all cells of DPM concentration.how you get that.. what is cell volume how you get this total mass.. i am fed up with this my problem to finding out the number of particle in my domain...or other wise i want to set a 3 particle in the domain,,how i can do that Help me please.....

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