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Old   November 22, 2004, 15:51
Default FINMES error message!!
  #1
Henry
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I have a fatal overflow error in the FINMES subroutine. Someone can help me? I try to change the resolution method, but donīt work.
kobe branty sy and oewnce932c like this.
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Old   November 23, 2004, 08:42
Default Re: FINMES error message!!
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James Date
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Hi,

Try reducing the physical time step size.

Regards James
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Old   November 23, 2004, 12:20
Default Re: FINMES error message!!
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Henry
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Thanks James! I reduce the phisical time step size to 10-5. SO I put to run and did the same error. May I change the size of the mesh grid? Do you know the best relation between the phisical time step and the mesh size? Thanks again. Regards Henry
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Old   November 25, 2004, 02:17
Default Re: FINMES error message!!
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Glenn Horrocks
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Hi,

The appropraite physical time step size is largely independant of the grid. You should use a timescale representative of your problem.

If you are still getting FINMES errors in the first iteration then you almost certainly need to reduce the timestep further.

Glenn
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Old   December 8, 2004, 00:00
Default Re: FINMES error message!!
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Neale
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Henry,

Many things could be wrong:

- Physical timescale may only be part of the problem. Typical rule of thumb is to use a maximum of 1/3 of the fluid residence time in through your device.

- Startup difficulties are typically initial guess related. How are you setting the initial guess for velocity and pressure for example??

- Perhaps you are running with turbulence on? Maybe you need to use the zero equation model to get a rough solution, and then restart with k-epsilon??

- Maybe your boundary conditions are too much at startup so you might need to ramp up your inlet total pressure or velocity as a function of iteration

As always, many things to go wrong, many things to try...

Neale
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Old   December 8, 2004, 05:59
Default Re: FINMES error message!!
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Henry
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Thank you for the help Neale,I will try some changes and see what happen. Thank you again.
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