Menu

Discussion Forum

New Discussion
Filter

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 The information provided may be out of date.

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

How to mesh plate with elliptical surface crack in comsol 4.1??

Posted May 5, 2011, 12:05 a.m. EDT Mesh Version 4.1 3 Replies

Deepak
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi,

I am trying to mesh plate with semi ellipsoid surface crack with tetrahedral element.Results i am getting, but some points shows the inverted mesh.how to deattach those point in comsol?/

Pls reply..


Deepak
3 Replies Last Post May 7, 2011, 6:40 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago May 5, 2011, 9:52 a.m. EDT
Hi

COMSOL normally changes the "2nd order" shape functions to linear where the the "inverted mesh" is identified. This is normally a warning, only. So basically COMSOL is looking after it. I'm not sure you need to worry more about it, apartthat you might ahve some "hot spots" or singularities building up hat are numeric, and not phsics

--
Good luck
Ivar
Hi COMSOL normally changes the "2nd order" shape functions to linear where the the "inverted mesh" is identified. This is normally a warning, only. So basically COMSOL is looking after it. I'm not sure you need to worry more about it, apartthat you might ahve some "hot spots" or singularities building up hat are numeric, and not phsics -- Good luck Ivar
Deepak
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago May 7, 2011, 2:24 a.m. EDT
How to get rid of singularity & hot spot??
How to get rid of singularity & hot spot??
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago May 7, 2011, 6:40 a.m. EDT
Hi

by using smooth (BC's "smoothly" applying loads on the boundaries or domains and not on lower order elements (edges or points in 3D). Avoid sharp edgs in the geometry^, the vertexs of a cube can inherite its properties from 3 faces / boundaries, hence it will take a "mean value" depending on the values of the 3+ nabouring faces, and edges, furthermore an external boundary does not (mostly) have any external load that balaces the domain laods, so stress, orelectric field or ... will build up.

i.e.e ACDC ES: where do you expect the highest fields ? close to sharp corners (that is physics, but the meshing and element discretisation tends also to worsen the effects, sometimes in an unphysical way, but not always ;)

--
Good luck
Ivar
Hi by using smooth (BC's "smoothly" applying loads on the boundaries or domains and not on lower order elements (edges or points in 3D). Avoid sharp edgs in the geometry^, the vertexs of a cube can inherite its properties from 3 faces / boundaries, hence it will take a "mean value" depending on the values of the 3+ nabouring faces, and edges, furthermore an external boundary does not (mostly) have any external load that balaces the domain laods, so stress, orelectric field or ... will build up. i.e.e ACDC ES: where do you expect the highest fields ? close to sharp corners (that is physics, but the meshing and element discretisation tends also to worsen the effects, sometimes in an unphysical way, but not always ;) -- Good luck Ivar

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content