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Claudia May 17, 2010 06:20

Particle Tracking
 
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

ghorrocks May 17, 2010 06:42

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).

Claudia May 17, 2010 06:59

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

ghorrocks May 17, 2010 08:07

I don't know. Why does it matter? In a steady state simulation run to convergence the answer will be the same.

Claudia May 17, 2010 08:10

This is a part of the simulation theory in my PhD. But you are right, it should have no influence on the results :-)

ghorrocks May 17, 2010 18:50

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.

Claudia May 18, 2010 02:42

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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