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Algorithm to compute the Von Mises stress
Posted Jun 23, 2014, 9:19 a.m. EDT General 1 Reply
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Dear Sirs,
I am currently carrying out a Finite Element Analysis of Arterial Tissue Mechanics in Comsol. My problem concerns the algorithm that is used in Comsol to compute the Von Mises stress given the displacement field of the computational domain.
Does Comsol use and smoothing procedure to post-process the displacement and get nice plots of the Von Mises stress? Before Comsol I was using another software and, with the same smooth and continuous solution I am obtainig now with Comsol, I was getting strong local variations of the Von Mises stress due to (my guess) to the orientation of the elements. This effect is no longer present in the Von Mises stress I compute with Comsol. Do you use any smoothing like Laplacian or Gaussian smoothing, normally employed in surface fairing?
Many thaks for your help.
Paolo Tricerri
I am currently carrying out a Finite Element Analysis of Arterial Tissue Mechanics in Comsol. My problem concerns the algorithm that is used in Comsol to compute the Von Mises stress given the displacement field of the computational domain.
Does Comsol use and smoothing procedure to post-process the displacement and get nice plots of the Von Mises stress? Before Comsol I was using another software and, with the same smooth and continuous solution I am obtainig now with Comsol, I was getting strong local variations of the Von Mises stress due to (my guess) to the orientation of the elements. This effect is no longer present in the Von Mises stress I compute with Comsol. Do you use any smoothing like Laplacian or Gaussian smoothing, normally employed in surface fairing?
Many thaks for your help.
Paolo Tricerri
1 Reply Last Post Jun 23, 2014, 9:23 p.m. EDT
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Posted:
1 decade ago
Hi
1) you have the equations used for all variables in the "equation view" (or all physics" check the doc and your preferences
2) the plot node contains settings for smoothing across mesh and interpolations, by default these are "on" check the help or doc for the explanations of the different ones
There are several good articles in the KB (Knowledge base of the COMSOL web site, just as well as there are several good explanation in the BLOG section of their site, also for these specific items (try the global search)
--
Good luck
Ivar
1) you have the equations used for all variables in the "equation view" (or all physics" check the doc and your preferences
2) the plot node contains settings for smoothing across mesh and interpolations, by default these are "on" check the help or doc for the explanations of the different ones
There are several good articles in the KB (Knowledge base of the COMSOL web site, just as well as there are several good explanation in the BLOG section of their site, also for these specific items (try the global search)
--
Good luck
Ivar