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to print residual or in a file...

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Old   February 23, 2012, 06:55
Default to print residual or in a file...
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Tom
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Hi community,

does anyone know how is possible to print the residual (i mean the one computed in simpleFoam, for example) in a file in the way to plot it and see how it develops during time?

Or maybe, that will be better, there is a way to compute the norms...I mean:

norm=(mag(U2)-mag(U1))/(t2-t1)

where 1 and 2 stand for two different choosen times...

Thanks in advance for the guys will answer my post...

ps: I don't too much about c++...i can understand that for someone these are obvious things...
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Old   February 23, 2012, 09:14
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I know it sounds stupid but before you open a new forum thread you should use the "Search" function.

An useful thread for your kind of problem can be found here.
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Old   February 23, 2012, 10:58
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Elvis
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Hi,

what about http://openfoamwiki.net/index.php/Co...mPlotRunner.py
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Old   February 23, 2012, 12:07
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Quote:
Originally Posted by elvis View Post
Hi,

Thank you for the answer, and i am sorry if i crossed with other thread...

The PyFoam is very usefull even if i got problem running it...By the way I want to ask if there is a way to compute the mag(U) residual...?

And how exactly the residual is computed?...if you can suggest me where to have a look could be great...

Thanks in advance
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Old   February 23, 2012, 12:10
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Quote:
Originally Posted by robbirobocop View Post
I know it sounds stupid but before you open a new forum thread you should use the "Search" function.

An useful thread for your kind of problem can be found here.
Hi,

It's not stupid and you are right...but i am new of the community...and also new about the possible probleam someone can find...so I didb't know how to find...anyway...

Can you explain me how the residual is compute please and if is possible to plot also the residual for the mag(U)?

thank you in advance!
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Old   February 24, 2012, 08:27
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Hi,

You can read the doctoral thesis by Hrvoje Jasak (spiritus rector of FOAM beside Henry Weller) Error Analysis and Estimation for the Finite Volume Method with Applications to Fluid Flows =>4.5 Residual Error Estimate page 173
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