Multiphase Problem Settings
I am student doing my project on FLUENT, piston analysis for oil cool gallery application.
I am using VOF model. In that my solution is diverging. Can anyone help me out with the appropriate settings? My objective is to find out the heat transfer and temperature distribution in the cooling oil gallery. I have tried with SIMPLE and PISO but still the solution is diverging. |
Hi,
Is your simulations steady or transient? wich method are you using for VOF (implicit or explicit). If you are in transient and explicit, you should decrease the time step (check the courant number), Piso is a good option, but I do not think it is your problem. |
Thank you sir for yor reply.
Avtually i am using Transient, VOF (implicit) settings. Still the solution is getting diverged in the "epsilon". Please help me for the correct settings. |
Quote:
I have seen in some works the application of PISO method with "0" value set in the "Skewness correction" option also. You should also check if your mesh meets the requirements of turbulence model and wall functions in use. Good luck. |
Looks like your problem is more with turbulence model (epsilon divergence) than the VOF, so maybe you should check this part.
As Jabba wrote, the best option of VOF is the explicit with geo-recronstuc, specially when you have to simulate an interface (free-surface), but also can be very unstable and you have to be care of the courant number or use the NITA option. Another option of VOF (no so good as explict-geo) is use the VOF implicit with "modified HRIC" that has a little diffusion in the interface but is more stable |
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