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Old   November 15, 2002, 12:42
Default VOF convergence
CFD Newbie
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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?


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Old   November 16, 2002, 02:11
Default Re: VOF convergence
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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 !!

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Old   November 18, 2002, 14:48
Default Re: VOF convergence
CFD Newbie
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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.


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Old   November 24, 2002, 02:14
Default Re: VOF convergence
mahdi saniee nezhad
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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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