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URGENT HELP: Too many vof sub-timesteps

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Old   July 25, 2006, 14:09
Default URGENT HELP: Too many vof sub-timesteps
  #1
lamlash
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Hi,

There is a error message just after begin the iterate step:

"Too many VOF sub time steps, the velocity field is probably diverging.Please check the solution and reduce the time steps if necessary".

Could you help me in this problem in urgent?

thanks very much.

lamlash
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Old   July 26, 2006, 00:39
Default Re: URGENT HELP: Too many vof sub-timesteps
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Gernot
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The message tells you what to do - reduce the time step. If that message appears at the first timestep, maybe you can improve the initial settings.
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Old   July 31, 2006, 14:54
Default Re: URGENT HELP: Too many vof sub-timesteps
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shanti
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The number of in the bracket indicate the VOF subtime steps needed to complete 1 physical time step. The time step would be such that

VOF sub time step < time step < 100* VOF sub time step

where VOF sub time step = Time step size given/ Number in the bracket.

Hope it helps Shanti
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