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mixture multiphase model (convergent-divergent nozzle)

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Old   July 9, 2020, 13:24
Default mixture multiphase model (convergent-divergent nozzle)
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Anwar
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Hello everyone,

I'm doing a simulation for multiphase flow (mixture model) to validate paperís results.
By the way, in the paper, the authors used this setup:
- Separation implicit solver.
- SIMPLE scheme were applied to resolve pressure-velocity coupling equation.
- the k-ε two-equation turbulent model, standard wall functions were employed to the flow in near-wall region.
- The second-order upwind difference scheme was also applied to improve the computational accuracy by
discretizing the physical parameters of volume control interface.
- the convergence precision 10-6 of the residual monitor for energy equation.
- a mixture model was selected with inter-phase velocity slip taken into account.

- conversion of mass source and energy source were compiled by User Defined Function (UDF) and coupled to flow functions. ( I have problem in this point, so I used evap/cond Lee model)
The main problem that I faced is instability in the solution, while I find the under-relaxation factors and evaporation frequency so significant factors in the solution.
Hope someone who has the experiences in this can help me. So, please find attached pictures that compares between my results and the paperís result, and give me your feedback.

Regards,
Anwar
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