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-   -   VOF convergence (http://www.cfd-online.com/Forums/fluent/30521-vof-convergence.html)

CFD Newbie November 15, 2002 12:42

VOF convergence
 
Hi all.

I'm solving a film flow over a plane with VOF. I'm having time steps of 10^-9, with underrelaxation factors of about 0.05, with PISO pressure-velocity coupling and Bodyweight pressure. The grid is quite coarse. Is there any trick to enhance convergence?

THanks

CFD newbie

david November 16, 2002 02:11

Re: VOF convergence
 
Right now I am post processing a film modeling. Whats your film thinkness. Pls tell me the detail film liquid properties, physical set-up, model you are using, what type of VOF (geo?, implicit steady?)..

Time step of 10e^-9 is too small !!

DC

CFD Newbie November 18, 2002 14:48

Re: VOF convergence
 
Hi, thanks for your answer, here is the info; I'm modeling a film over a sphere of 1 mm, subject to gravity, the liquid has density of 780 kg/m3, 0.0024 kg/ms. I'm using VOF in axisymetrical coordinates with geo reconstruction and unsteady implicit formulation.

I've figured out that the initial setup of the simulation has a great influence in the convergence history, now I'm getting 10-7 sec of time step that ( I think is still too small).

I can provide any other info.

Regards

Newbie

mahdi saniee nezhad November 24, 2002 02:14

Re: VOF convergence
 
Dear sir I have a problem with this title. If it's possible for you please send me your received responses. Very thanks for your attention to my request. With the best regards. Mahdi saniee nezhad



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