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how to plot error vs iteration number comsol?

Posted May 30, 2016, 3:59 p.m. EDT Fluid & Heat, Porous Media Flow, Mesh, Studies & Solvers Version 5.2 2 Replies

Richard Storm
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All I can see is the "reciprocal of step size" vs "Time step" in the progress window of the solution but I do not know how to plot error vs iteration number in comsol. Can I do it real time or it will be shown after the solution is done? I appreciate your help. thank you.
2 Replies Last Post Jul 5, 2016, 7:49 p.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 9 years ago May 30, 2016, 5:12 p.m. EDT
Hi

check the Blog pages (and sometimes there are useful hints in the Knowledge Base too) all on COMSOL's web pages

i.e.
www.comsol.eu/blogs/category/all/meshing/
www.comsol.eu/blogs/category/all/solvers/
...
--
Good luck
Ivar
Hi check the Blog pages (and sometimes there are useful hints in the Knowledge Base too) all on COMSOL's web pages i.e. https://www.comsol.eu/blogs/category/all/meshing/ https://www.comsol.eu/blogs/category/all/solvers/ ... -- Good luck Ivar
Mehrdad Bastani
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Posted: 8 years ago Jul 5, 2016, 7:49 p.m. EDT
Hi Ivar,

I checked the links you provided regarding plot error vs. time. Those are helpful and I found we can use "resdiual" operator to plot error for a velocity field. I tried it for "Darcy's Law" to plot error vs. time for "velocity". But when I want to use it for "Transport of dilute solution in porous media" for plotting error vs. time for concentration , it does not work. It gives me for all times, an empty geometry without any results or data distribution on it !!! ... I was wondering if there is any other way to plot error vs. time.

It is strange that the default plot for comsol (convergence plot) shows "reciprocal vs. time" only and not "error vs. time" !!!!

Thanks,
Mehrdad
Hi Ivar, I checked the links you provided regarding plot error vs. time. Those are helpful and I found we can use "resdiual" operator to plot error for a velocity field. I tried it for "Darcy's Law" to plot error vs. time for "velocity". But when I want to use it for "Transport of dilute solution in porous media" for plotting error vs. time for concentration , it does not work. It gives me for all times, an empty geometry without any results or data distribution on it !!! ... I was wondering if there is any other way to plot error vs. time. It is strange that the default plot for comsol (convergence plot) shows "reciprocal vs. time" only and not "error vs. time" !!!! Thanks, Mehrdad

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