# multiphase flow model (water+oil)

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 May 26, 2013, 22:23 multiphase flow model (water+oil) #1 New Member   H.A Join Date: Jul 2012 Posts: 5 Rep Power: 7 Good day all I have multiphase flow model with one fluid (oil+water) in gravity separator tank how can i know the amount or volume of oil mixture in water for flow 3D second question, is there a way to know the oil concentration for example after 100 second from mixture Thanks

 May 30, 2013, 13:57 #2 Member   Join Date: Mar 2012 Posts: 72 Rep Power: 7 If you're using the 2-fluid model then the mixture concentration is defined by the fluid fraction. You can then measure the volume of each fluid using a sampling volume.

 June 2, 2013, 09:39 multiphase flow model (water+oil) #3 New Member   H.A Join Date: Jul 2012 Posts: 5 Rep Power: 7 thanks a lot for your reply dmilano Kindly if i define the initial fluid regions with appropriate densities (in model setup - initial) fluid region 1 : water density 1000 fluid region 2 il density 800 and i have the rate of oil inside the water 5% , so how much define the fluid fraction for each fluid and where define it in initial or in boundary conditions? thanks

 June 3, 2013, 10:11 #4 Member   Join Date: Mar 2012 Posts: 72 Rep Power: 7 In two fluid problems the density is computed from the fluid fraction, not the other way around. If you define fluid 1 as water and fluid 2 as oil then you just specify the mixture fluid fraction in the initial conditions and at the boundaries. For example, if you had a mixture of 5% oil and 95% water entering at a boundary you would specify a fluid fraction of 0.95 at this location.

 June 5, 2013, 00:24 #5 New Member   H.A Join Date: Jul 2012 Posts: 5 Rep Power: 7 Dear dmilano if i choose two number of fluid then there is no free surface (no out flow) in my case i have a free surface separator tank and the inlet flow is mixture between oil and water. which the best model must be use Drift flux source mass or scalars thanks alot

 June 5, 2013, 10:30 #6 Member   Join Date: Mar 2012 Posts: 72 Rep Power: 7 Sorry - I didn't realize that there was a free surface. In this case you'll probably want to use the 1 fluid drift flux model and specify the mixture density at the boundaries, initial conditions, and sources.

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