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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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How to remove the waviness in MISES STRESS curve

Posted 2015年5月17日 GMT-4 15:33 Results & Visualization, Structural Mechanics Version 4.4 2 Replies

Rong Xu
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Hi,

Recently I simulate an elastic-plastic model in solid mechanics module. When I get the mises stress curve, as shown in fig.Mises. I found there are many waves on the curve. How can I avoid this waviness?

I have tried high order shape function(cubic) and the waviness becomes less obvious. However, I cannot use much higher(like quartic) because of the convergence problem. So I want to know is there other ways to avoid this waviness? Thanks!

Best,
Rong

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2 Replies Last Post 2015年5月18日 GMT-4 15:30
Henrik Sönnerlind COMSOL Employee

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Posted: 10 years ago 2015年5月18日 GMT-4 10:23
Hi,

This is a postprocessing artifact. There are two things you can do:

1. Specifically for stresses in structural mechanics: Plot results at Gauss points instead (solid.misesGp, for example).

2. Generally, in the Quality section of the result nodes (like Line Graph or Surface Plot), set Resolution to 'No Refinement'.

Regards,
Henrik
Hi, This is a postprocessing artifact. There are two things you can do: 1. Specifically for stresses in structural mechanics: Plot results at Gauss points instead (solid.misesGp, for example). 2. Generally, in the Quality section of the result nodes (like Line Graph or Surface Plot), set Resolution to 'No Refinement'. Regards, Henrik
Rong Xu
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Posted: 10 years ago 2015年5月18日 GMT-4 15:30
Hi Henrik,

Thanks so much. It is very useful. Now the curves looks much smoother.
Through your way, I remove the refinement in postprocessing so that the Runge's phenomenon would not appear again. Thank!

Best,
Rong
Hi Henrik, Thanks so much. It is very useful. Now the curves looks much smoother. Through your way, I remove the refinement in postprocessing so that the Runge's phenomenon would not appear again. Thank! Best, Rong

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