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How to plot the relative error?

Posted 29 apr 2013, 03:42 GMT-4 Results & Visualization, Studies & Solvers 5 Replies

Evgeni Sergeev
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I've just spent more than a whole day troubleshooting my model.
However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes.
There was a problem localised to a particular junction between domains.

So, is there any way to visualise the relative error in a domain? Maybe via Livelink for Matlab? I couldn't find anything about that.
5 Replies Last Post 23 nov 2016, 14:04 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 29 apr 2013, 06:11 GMT-4
Hi

I fully agree with you that a better way to find the variables names, typically of such internal variables that gives us a better understanding where the solver is locked would help for debugging.

Today you need to scan many pages o help files and still after 30 min I did not manage to localise the L2 norm variable name, neither not find it in the "equation view" (and there are no specific equation view for the solvers)

Try to push it over to "support" if you explain clearly why it's useful, then you might see it appear in next revision

--
Good luck
Ivar
Hi I fully agree with you that a better way to find the variables names, typically of such internal variables that gives us a better understanding where the solver is locked would help for debugging. Today you need to scan many pages o help files and still after 30 min I did not manage to localise the L2 norm variable name, neither not find it in the "equation view" (and there are no specific equation view for the solvers) Try to push it over to "support" if you explain clearly why it's useful, then you might see it appear in next revision -- Good luck Ivar
Evgeni Sergeev
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Posted: 1 decade ago 1 mag 2013, 01:26 GMT-4
Hi Ivar,

I've checked with support. Summarising:
• Currently there is indeed no way to access the variable.
• Others have requested this feature too.
• The variable is planned to be exposed for post-processing in a later version.
• It's not known which version that will be.

Evgeni
Hi Ivar, I've checked with support. Summarising: • Currently there is indeed no way to access the variable. • Others have requested this feature too. • The variable is planned to be exposed for post-processing in a later version. • It's not known which version that will be. Evgeni
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 1 mag 2013, 02:22 GMT-4
Hi

then probably its not in next release I have heard will come soon, to bad, would be helpful indeed :)

--
Good luck
Ivar
Hi then probably its not in next release I have heard will come soon, to bad, would be helpful indeed :) -- Good luck Ivar
Camille S.
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Posted: 10 years ago 21 mag 2015, 05:50 GMT-4
Hello,

I would like to know if it is now possible to plot the relative error.
Actually, my aim is to understand the influence on my result of the factor in error estimate of the Direct Time-Dependant Solver. That is why I need to plot the relative error.

Best regards
Hello, I would like to know if it is now possible to plot the relative error. Actually, my aim is to understand the influence on my result of the factor in error estimate of the Direct Time-Dependant Solver. That is why I need to plot the relative error. Best regards
DW
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Posted: 8 years ago 23 nov 2016, 14:04 GMT-5
See the blog "plotting-the-algebraic-residual-to-study-model-convergence"
www.comsol.com/blogs/plotting-the-algebraic-residual-to-study-model-convergence/

-DW
See the blog "plotting-the-algebraic-residual-to-study-model-convergence" https://www.comsol.com/blogs/plotting-the-algebraic-residual-to-study-model-convergence/ -DW

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