# Particle Tracking

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 May 17, 2010, 06:20 Particle Tracking #1 Member   Join Date: Mar 2009 Posts: 34 Rep Power: 8 Hi, there are two possibilties for particle tracking in CFD: simultaneous and gradual. Which kind of tracking is implemented in CFX for steady state simulations? Thanks in advance Claudia

 May 17, 2010, 06:42 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,828 Rep Power: 85 I have no idea what simultaneous and gradual means. In CFX, for steady state simulations you can have one-way coupled particles (where the particles do not affect the flow field) and two-way coupled particles (where the particle affects the flow field).

 May 17, 2010, 06:59 #3 Member   Join Date: Mar 2009 Posts: 34 Rep Power: 8 Sorry, I think the question was not clear. Just try again: If I have a lagrangian particle tracking, I have a calculation of the particle tracks. Does CFX calculate first one complete track from start to end and then the next track from start to end and so on? or: takes CFX every particle at the same time, moves all particel a small timestep, and calculate them again? Was it more clear? Thanks, Claudia

 May 17, 2010, 08:07 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,828 Rep Power: 85 I don't know. Why does it matter? In a steady state simulation run to convergence the answer will be the same.

 May 17, 2010, 08:10 #5 Member   Join Date: Mar 2009 Posts: 34 Rep Power: 8 This is a part of the simulation theory in my PhD. But you are right, it should have no influence on the results :-)

 May 17, 2010, 18:50 #6 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,828 Rep Power: 85 The more important question is how the particle tracks are coupled back to the flow in the case of two-way coupling. In this case the flow is solved, then the particle tracks are solved based on the flow field, then the flow is re-computed based on the coupling with the particle tracks.

 May 18, 2010, 02:42 #7 Member   Join Date: Mar 2009 Posts: 34 Rep Power: 8 Glenn, you are completely right, it was information only :-). The Way of coupling is two-way and this is the right choice for this problem. Greets, Claudia

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