Lagrangian Tracking in CFX (Multiphase flow)
Hi all,
I would be grateful if you answer my question. As far as I know there are 2 main approaches of multiphase modelling: EulerEuler when particle phase is assumed continuos and EulerLagrangian, when each particle is treated as single. In CFX help it is said that in case of Lagrnagian particle tracking each eddy particle enters has some fluctuating velocity due to turbulence which is added to mean velocity. And that resulting velocity affects particle movement. But what about NavierStokes equations for each eddy in this case? are they ignored? or in other words: Is fluid phase is calculated using Eulerian approach if we use lagrangian particle tracking in CFX? or it is calculated as it is said above? Thank you! 
Lagrangian particle tracking does not consider "eddy particles" (what ever they are). It considers true solid particles are moved about in the flow through drag forces and other forces.
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But all these forces require defined speed of fluid phase. What i mean is how fluid phase is treated ( or how is it described) and how we get that speed of fluid phasein CFX if lagrangian particle tracking applied? Thank you.

This is all in the documentation. The fluid phase is modelled with the NS equations, and the particle phase by particle kinematics. The particle phase is coupled to the fluid phase using source terms.

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