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Old   September 24, 2008, 11:36
Default Continuity question???
  #1
Jane
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Why my continuity graph increase until Fluent show ERROR message?? what happen??

How to set Volume in Fluent??? for example set 5ml fluid for filling purpose.

anyone please help me...

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Old   September 25, 2008, 02:28
Default Re: Continuity question???
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joao
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Can you tell more details about what you are trying to simulate?
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Old   September 25, 2008, 02:40
Default Re: Continuity question???
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Jane
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Thank you for reply.

I'm simulating water filling to a gap between 2 plastic plate, it's capillary case. I use VOF and multiphase in my simulation.

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Old   September 25, 2008, 03:45
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joao
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What are your boundary conditions?
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Old   September 25, 2008, 03:51
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Jane
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rectangular plates: 1 inlet= velocity inlet 3 outlet= outflow

any suggestion about boundary conditions. thanks
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Old   September 25, 2008, 04:04
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joao
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I can't see exactly what your simulation is like, but I can give you some general advices:

1. Check your grid in Fluent. 2. Check your case. This will tell you if there is something wrong with your setup.

If you don't have any problems with the above, then you should run your simulation for 10-20 iterations, and then check the mass residuals by contour plots or whatever, to see where are you having problems.

Cheers
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Old   September 25, 2008, 04:09
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Jane
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Thanks. i will try it.
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Old   September 25, 2008, 09:25
Default Re: Continuity question???
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max
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Hi Jane,

as far as i know, outflow Bc, i.e. a zero gradient condition is not applicable for VOF-Simulations. Switch to pressure outlet and make sure that only one phase can enter here if back flow occures.

cheers

max
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Old   September 25, 2008, 21:02
Default Re: Continuity question???
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Jane
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Thank you max.

I have tried using pressure outlet, but i found the problem that reversed flow in my filling simulation.

May i know how to make sure only 1 phase enter??

Thank you
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