Eulerian-Eulerian method and Lagrangian Particle Tracking method

100tinela · January 31, 2012, 06:48

I am trying to simulate a transient/turbulent two-phase flow (oil mist and gas) through a pipe in ANSYS CFX 13.0 and my goal is to analyse the influence of different oil mass fractions (<5%) on its transient path.
Reading the CFX Help I've seen that the one-phase Lagrangian Particle Tracking method may be the most suited for this case (low mass fraction), but I've also seen that it becomes too expensive to include turbulence models. In this case, does anyone know if a Eulerian-Eulerian method like the "Dispersed fluid" would be viable in terms of grid resolution, computacional effort and results quality?

I would appreciate any help,
Willian

ghorrocks · January 31, 2012, 18:48

The decision as to use particle tracking or an eularian approach is more about whether you need histories for individual particles. Particle tracking is the only approach which allows you to track particle histories. If the Eularian approach of a control volume average condition is good enough then I would use that.

January 31, 2012, 06:48	Eulerian-Eulerian method and Lagrangian Particle Tracking method	#1
100tinela New Member Willian Join Date: Jan 2010 Location: Brasil Posts: 18 Rep Power: 4	I am trying to simulate a transient/turbulent two-phase flow (oil mist and gas) through a pipe in ANSYS CFX 13.0 and my goal is to analyse the influence of different oil mass fractions (<5%) on its transient path. Reading the CFX Help I've seen that the one-phase Lagrangian Particle Tracking method may be the most suited for this case (low mass fraction), but I've also seen that it becomes too expensive to include turbulence models. In this case, does anyone know if a Eulerian-Eulerian method like the "Dispersed fluid" would be viable in terms of grid resolution, computacional effort and results quality? I would appreciate any help, Willian

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January 31, 2012, 18:48		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 5,068 Rep Power: 42	The decision as to use particle tracking or an eularian approach is more about whether you need histories for individual particles. Particle tracking is the only approach which allows you to track particle histories. If the Eularian approach of a control volume average condition is good enough then I would use that.