# Euler-lagrange or Euler-Euler Model? Wich is the best for this case

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October 15, 2011, 16:23
Euler-lagrange or Euler-Euler Model? Wich is the best for this case
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Senior Member

Julio Mendez
Join Date: Apr 2009
Location: Greensboro, U.S.A
Posts: 106
Rep Power: 8
Dear Colleagues,
I am working simulating a vertical oil-gas separator in ANSYS CFX.
The inlet conditions are:

Liquid mass flow (lb/s): 10,04071181
Gas mass flow (lb/s): 15,50694444
Liquid Volume fraction : 0,041947644
Gas Volume Fraction: 0,958052356

As you can see, the liquid Volume fraction is very small.
My doubt is, Which of the two multiphase model is better for my case, Euler-Euler or Euler-lagrange?.

I have read a lot and I am almost sure that I can use the Euler- Euler since it is the most general model, wheras lagrange-euler is often used to tracking and for solid- gas phase.

What do you think???
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 October 16, 2011, 17:18 #2 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,929 Rep Power: 85 The difference between eular-eular and eular-lagrange is explained in the documentation. The e-e approach is good for high particle volume fractions and physics which is best captured in a eularian framework (eg packing pressure). The e-l approach is good for low particle phase volume fractions and physics which is best captured in a lagrangian framework (eg individual particle histories).

 October 17, 2011, 08:06 #3 Senior Member   Julio Mendez Join Date: Apr 2009 Location: Greensboro, U.S.A Posts: 106 Rep Power: 8 Dear Glenn, I am pretty clear in what you said. The problem is, as you saw in my post, the volume fraction of the liquid phase is just 0.05 whereas the volume fraction of the gas phase is 0.95. I have read some articles, where they use E-L model for VERY LOW volume fraction, for example, 10^-6 for the disperses phase. If you readfluent´s manual , there is a "zone" where you can use the E-L model and the E-E model. I have not found any research where they compare the E-L model with the E-E model for very low volume fraction to low or intermediate volume fraction. As a result I want to know the experience of our colleagues.

 October 17, 2011, 17:30 #4 Super Moderator   Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 10,929 Rep Power: 85 e-e and e-l both work fine at low particle volume fractions. The choice then is whether the lagrangian approach is best (ie particle histories and others) or the eularian approach is best (ie you don't care about individual particles, just want them to act as a continuum) The choice is not simply made by volume fractions.

 September 4, 2014, 07:31 Eluer #5 Member   Muhammed Asmail Join Date: Nov 2009 Location: Iraq Posts: 36 Rep Power: 7 Hi all How can i reach to Euler-lagrange approach &Eluer-Euler-lagrange approach in ANSYS-FLUENT? , i need the path in this program Many thanks

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