[Anshs]

I am modeling a multiphase flow with species transport equation. There are phases like a water column and overlying oil phase, and the water column is being stirred with DPM particles.

Both water and oil phases are defined as mixture material like water = h2o(liq) + hnco ( 0.001 fraction) , oil = diesel(liq) (0.99 fraction) + O2 (0.01 fraction).

I'm using the implicit VOF method for interface tracking, and the PISO algorithm for p-v coupling.

The results are not satisfactory when I'm using mixture materials for the phases.

Initial condition: There are 3 phases of water, oil, and air. each lying above the other in order of density ( water, oil, air).

Results ( when phases are not defined as a mixture ): These results are satisfactory with the experiments.
Screenshot 2020-07-24 at 4.27.39 AM.jpg

Results ( when phases are defined as a mixture ) :
Screenshot 2020-07-24 at 4.40.44 AM.jpg

These results when the material is defined as a mixture are not as expected. I'm also attaching the species plots and velocity profile plot:

Screenshot 2020-07-24 at 4.50.03 AM.jpg.


Thank you for all the help.