Inhomogeneous two fluid model with mixing fluids

vkaufmann · January 8, 2007, 13:14

Hi all,

is there any solver which can handle mixing fluids calculating a velocity field for each phase? Means something like bubbleFoam but without the restriction of one phase to be disperse. In twoLiquidMixingFoam a homogeneous approach seems to be implemented, right?
If there's no solver, how is this restriction in bubbleFoam implemented or is it possible to modify twoLiquidMixingFoam in an appropriate way?

Thanx a lot in advance.

Volker

msrinath80 · January 8, 2007, 13:30

"without the restriction of one phase to be disperse"

Just what kind of flow pattern are we talking about here? Stratified?

vkaufmann · January 8, 2007, 13:46

The whole thing is about flow regime transition of bubbly flows in vertical pipes. So the flow patterns vary between disperse bubbly flow to slug/churn flow. I'm trying to model the interfacial area density in these flows. A homogeneous approach will not work as you cannot assume the velocity field to be equal for both phases.

msrinath80 · January 8, 2007, 14:05

I guess bubblefoam or twoPhaseEulerFoam is the proper starting point. You will certainly need a Population balance model to properly account for bubble breakage and coalescence since you are interested in interfacial area density.

Oh and here is a reference I remember from my Masters:

Navarro-Valenti, S., R. T. Lahey Jr., D. A. Drew and M. Mills, "Two-fluid modeling of the bubbly/slug flow regime transition", Transactions of the American Nuclear Society Winter Meeting, 69, 495-496 (1993).

alberto · January 8, 2007, 15:44

Hello,
bubbleFoam and twoPhaseEulerFoam are solvers based on the Eulerian-Eulerian two fluid approach. So they should be suitable for your purpose.

A momentum equation is solved for both phases, so you're not assuming the same velocity field for the phases.

You may need to change the turbulence model, if you need something more advanced than the mixture model implemented at the moment.

Regards,
Alberto

January 8, 2007, 13:14	Hi all, is there any solver	#1
vkaufmann New Member Volker Kaufmann Join Date: Mar 2009 Posts: 5 Rep Power: 17	Hi all, is there any solver which can handle mixing fluids calculating a velocity field for each phase? Means something like bubbleFoam but without the restriction of one phase to be disperse. In twoLiquidMixingFoam a homogeneous approach seems to be implemented, right? If there's no solver, how is this restriction in bubbleFoam implemented or is it possible to modify twoLiquidMixingFoam in an appropriate way? Thanx a lot in advance. Volker

January 8, 2007, 13:30	"without the restriction of on	#2
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	"without the restriction of one phase to be disperse" Just what kind of flow pattern are we talking about here? Stratified?

January 8, 2007, 13:46	The whole thing is about flow	#3
vkaufmann New Member Volker Kaufmann Join Date: Mar 2009 Posts: 5 Rep Power: 17	The whole thing is about flow regime transition of bubbly flows in vertical pipes. So the flow patterns vary between disperse bubbly flow to slug/churn flow. I'm trying to model the interfacial area density in these flows. A homogeneous approach will not work as you cannot assume the velocity field to be equal for both phases.

January 8, 2007, 14:05	I guess bubblefoam or twoPhase	#4
msrinath80 Senior Member Srinath Madhavan (a.k.a pUl\|) Join Date: Mar 2009 Location: Edmonton, AB, Canada Posts: 703 Rep Power: 21	I guess bubblefoam or twoPhaseEulerFoam is the proper starting point. You will certainly need a Population balance model to properly account for bubble breakage and coalescence since you are interested in interfacial area density. Oh and here is a reference I remember from my Masters: Navarro-Valenti, S., R. T. Lahey Jr., D. A. Drew and M. Mills, "Two-fluid modeling of the bubbly/slug flow regime transition", Transactions of the American Nuclear Society Winter Meeting, 69, 495-496 (1993).

January 8, 2007, 15:44	Hello, bubbleFoam and twoPhas	#5
alberto Senior Member Alberto Passalacqua Join Date: Mar 2009 Location: Ames, Iowa, United States Posts: 1,912 Rep Power: 36	Hello, bubbleFoam and twoPhaseEulerFoam are solvers based on the Eulerian-Eulerian two fluid approach. So they should be suitable for your purpose. A momentum equation is solved for both phases, so you're not assuming the same velocity field for the phases. You may need to change the turbulence model, if you need something more advanced than the mixture model implemented at the moment. Regards, Alberto __________________ Alberto Passalacqua GeekoCFD - A free distribution based on openSUSE 64 bit with CFD tools, including OpenFOAM. Available as in both physical and virtual formats (current status: http://albertopassalacqua.com/?p=1541) OpenQBMM - An open-source implementation of quadrature-based moment methods. To obtain more accurate answers, please specify the version of OpenFOAM you are using.

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