Stratified Oil-water Flow simulation

February 25, 2009, 20:57

Hi Fluent Users: I've been trying to reproduce, using Fluent, the results for this paper on stratified Oil-water flow: "Numerical study of stratified oilâ€"water two-phase turbulent flow in a horizontal tube" by Hui Gao, Han-Yang Gu and Lie-Jin Guo, they used their own CFD code and got preety good agreement with the Experimental axial velocity profiles. The thing is that I always get profiles like there were only one phase flowing (no matter the water cut). On that paper (and on the original thesis the data was taken from) the axial velocity profile has a smooth curve right on the interface of both phases (in the opossite direction to the flow), I used a 0.05575m diameter,5m long grid with the inlet divided into 2 faces were I put constant mass flow for both phases, and i'm using Pressure outlet as a BC on the outlet, explicit VOF model (geo-reconstruction), k-w sst for turbulence, in a transient run. FOr initial conditions I define a region (the half lower one) and put there water volume fraction = 1 and 0 for the other half. I hope someone could help me with this matter, FLuent manuals say that for VOF it uses Brackbill's formulation by default, perhaps I don't know how to activate it, and that could be the problem, I'd apreciate any help you could give me.

ravi1650 · May 17, 2009, 18:01

hi,

Even I am working on the same topic.
Can you please send me the paper that you mentioned in your post?

duaiduaihu · May 18, 2009, 20:20

hi!
i think it is unnecessary to activate it!
CSF model is activated, when VOF model is selected to deal with the interface!
i think this is the meaning of "default"
i also want to know your ideas!

February 25, 2009, 20:57	Stratified Oil-water Flow simulation	#1
Mijail Guest Posts: n/a	Hi Fluent Users: I've been trying to reproduce, using Fluent, the results for this paper on stratified Oil-water flow: "Numerical study of stratified oilâ€"water two-phase turbulent flow in a horizontal tube" by Hui Gao, Han-Yang Gu and Lie-Jin Guo, they used their own CFD code and got preety good agreement with the Experimental axial velocity profiles. The thing is that I always get profiles like there were only one phase flowing (no matter the water cut). On that paper (and on the original thesis the data was taken from) the axial velocity profile has a smooth curve right on the interface of both phases (in the opossite direction to the flow), I used a 0.05575m diameter,5m long grid with the inlet divided into 2 faces were I put constant mass flow for both phases, and i'm using Pressure outlet as a BC on the outlet, explicit VOF model (geo-reconstruction), k-w sst for turbulence, in a transient run. FOr initial conditions I define a region (the half lower one) and put there water volume fraction = 1 and 0 for the other half. I hope someone could help me with this matter, FLuent manuals say that for VOF it uses Brackbill's formulation by default, perhaps I don't know how to activate it, and that could be the problem, I'd apreciate any help you could give me.

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May 17, 2009, 18:01		#2
ravi1650 New Member Ravi Kapoor Join Date: May 2009 Posts: 6 Rep Power: 16	hi, Even I am working on the same topic. Can you please send me the paper that you mentioned in your post?

May 18, 2009, 20:20		#3
duaiduaihu New Member Eric Join Date: Apr 2009 Posts: 23 Rep Power: 17	hi! i think it is unnecessary to activate it! CSF model is activated, when VOF model is selected to deal with the interface! i think this is the meaning of "default" i also want to know your ideas!