# Particle Trapped on The Wall

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 May 23, 2013, 19:16 Particle Trapped on The Wall #1 New Member   Liliana de Luca Xavier Augusto Join Date: Feb 2013 Posts: 23 Rep Power: 4 Hello! I am working with particles in a unique domain. But I need to know how many particles deposit on the wall in three different portions (like if I divided my domain in three). So, in CFD post, I created cross-section planes and calculate the mass flow of the particles using the function calculators. But I have a problem: in some portions recircuations zones exists, so the mass flow are bigger than the real number of particles. Anybody could help me? Anyone have an idea to divided my domain in three parts and then calculated how many particles deposition in each parts? Thanks in advance!

 May 23, 2013, 19:33 #2 New Member   Liliana de Luca Xavier Augusto Join Date: Feb 2013 Posts: 23 Rep Power: 4 I forgot to say: I am using Eulerian-Lagrangian approach.

 May 23, 2013, 21:35 #3 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 Hi, If you assigned 3 boundaries (wall1, wall2,wall3) in CFX-pre and then you can see in out put file, there is a summary of particle tracking, "particles on wall..".

 May 23, 2013, 21:43 #4 New Member   Liliana de Luca Xavier Augusto Join Date: Feb 2013 Posts: 23 Rep Power: 4 let me see if i understood... i have to set 3 boundary conditions in cfx-pre? i'm kind of new in CFD.. sorry! But for this, I need to have 3 different geometries? Like 3 domains?

 May 23, 2013, 21:55 #5 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 hi, If I understand your problem correctly, in cfx-pre, you have to assign 1st domain and then boundaries under domain. there you can assign 3 walls separately.

 May 23, 2013, 21:59 #6 New Member   Liliana de Luca Xavier Augusto Join Date: Feb 2013 Posts: 23 Rep Power: 4 Okay! I think I got the idea! I was wondering if there was another way to do this. But I can't think in another way! I believe that the 3 domains will solve my problem! Thanks so much, Sakura!

 May 23, 2013, 22:06 #7 Senior Member   S.Bogoda Join Date: Jul 2012 Posts: 133 Rep Power: 5 hi hi, you don't need 3 domains, you can define one domain and boundaries as, inlet, outlet, wall1, wall2, wall3 and so on.

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