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questions to the plot of pyFoamPlotWatcher

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Old   May 5, 2011, 09:44
Default questions to the plot of pyFoamPlotWatcher
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Hi,

I have simulated a steady state flow of air with no heat transfer with simpleFoam. Because it is my first time using the pyFoamPlotWatcher I have some questions:

- I think the epsilon_max is very strange. Can I plot the epsilon values to see where the high epsilon value appears in the geometry?
- What is meant with CUmultative and Global?
- Is it fine that the residues begin to jitter when they shrink? Is this due to the logarithmic scale?

Best Regards,
tH3f0rC3
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Old   May 5, 2011, 11:03
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don lenardo
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you can use paraView to show the epsilon values of your geometry!
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Old   May 9, 2011, 02:59
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Quote:
Originally Posted by lentschi View Post
you can use paraView to show the epsilon values of your geometry!
So you think these values of epsilon are not realistic?
And do you know what is meant with continuity?
cumultative is plotted global and cumultative. As I understand, cumultative is the summed version of global.
But what is meant with global continuity?

Best Regards,
tH3f0rC3

Last edited by tH3f0rC3; May 9, 2011 at 03:28.
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Old   May 9, 2011, 03:33
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don lenardo
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Bounding variables sometimes occur. Their values depend amongst others on the geometry. So in your cae these values could be correct!

In my (complex) geometry, bounding variables occur too in some loadcases but I "have to live with them" and neglect them.
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Old   May 9, 2011, 03:43
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Ah ok,
thanks for your answer!
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Old   February 20, 2015, 06:40
Default Continuity
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Am I right if I assume the "Continuity" plot to show the error of the solution of the continuity equation?

normally it should be zero that is (as far as I can see): no mass is added and nothing is lost.

Is this correct?

----

Another question:

why does the residual plot always show the first/initial residual of a timestep? shouldn't it be displaying the last/final residual after the iterations done?
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Old   March 5, 2015, 09:25
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Hi all,
Quote:
Originally Posted by Knigge46 View Post
Another question:

why does the residual plot always show the first/initial residual of a timestep? shouldn't it be displaying the last/final residual after the iterations done?
It wouldn't make much sense because the residual of the last iteration is allways below the tolerance you defined in fvSolution unless the number of iterations is over the maximum number of iterations defined in the same file, in such case the solver stops with an error.

Regards,

Alex
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