Menu

Discussion Forum

New Discussion
查找

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 The information provided may be out of date.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 a 3D closed rotating object with an irregular surface

Posted 2012年6月10日 GMT-4 19:40 Structural Mechanics Version 4.2a 7 Replies

Zhengui Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

hi,

I have a model that looks like a torus, however, the rotating surface is an irregular polygon.
At first, i cut into two pieces and mesh only half of the model.So I can select the cross section(the rotating surface) as the swept surface, and it swepts very well.
Now i want to swept the whole model,but i cannot select the cross section because it's a closed rotating object and don't have any cross section to select.
Does anybody have some suggestions?
7 Replies Last Post 2012年6月13日 GMT-4 02:42
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 2012年6月11日 GMT-4 00:46
Hi

cut your model into 2 halves, or generate it by 2 rotations of 180° that is from my experience the easiest

--
Good luck
Ivar
Hi cut your model into 2 halves, or generate it by 2 rotations of 180° that is from my experience the easiest -- Good luck Ivar
Zhengui Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年6月11日 GMT-4 09:32
hi,thanks

I don't know how to cut. I try to cut it use a very thin extrude and then difference. Finally. there will be a gap between the two parts. Can I use identity pair to connect the two parts. I try to find a way to just cut it without any gap between two parts

thanks a lot

zhengui
hi,thanks I don't know how to cut. I try to cut it use a very thin extrude and then difference. Finally. there will be a gap between the two parts. Can I use identity pair to connect the two parts. I try to find a way to just cut it without any gap between two parts thanks a lot zhengui
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 2012年6月11日 GMT-4 11:11
Hi

try to avoid small gaps. You can cut by making a workplane with a rectangle or a circle at the dimensions of you shadow, but you do not need to extrude it, it makes a "thin" surface of "0" thickness, and in union mode your geometry should be cut that way

--
Good luck
Ivar
Hi try to avoid small gaps. You can cut by making a workplane with a rectangle or a circle at the dimensions of you shadow, but you do not need to extrude it, it makes a "thin" surface of "0" thickness, and in union mode your geometry should be cut that way -- Good luck Ivar
Zhengui Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年6月11日 GMT-4 12:44
hi, thanks very much

I follow your suggestions, however, I failed to form union after I draw a rectangle in a workplane: "error,boolean geometry operation failed".

I can form assembly but the torus is still one domain. In another word, I didn't cut it into two parts.

In fact, I need to form assmely rather then union because my entire model includes four parts. I should treat the four parts seperately.

thanks your help very much


zhengui
hi, thanks very much I follow your suggestions, however, I failed to form union after I draw a rectangle in a workplane: "error,boolean geometry operation failed". I can form assembly but the torus is still one domain. In another word, I didn't cut it into two parts. In fact, I need to form assmely rather then union because my entire model includes four parts. I should treat the four parts seperately. thanks your help very much zhengui
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 2012年6月11日 GMT-4 14:40
Hi

I would suggest that you check the doc again and test it out on simple rectangles, cutting domains does work with workplanes and surfaces drawn on the workplane, If you extrude they get a thickness, if not they remain thin surfaces

--
Good luck
Ivar
Hi I would suggest that you check the doc again and test it out on simple rectangles, cutting domains does work with workplanes and surfaces drawn on the workplane, If you extrude they get a thickness, if not they remain thin surfaces -- Good luck Ivar
Zhengui Zhang
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 1 decade ago 2012年6月12日 GMT-4 12:51
hi, Ivar,

thanks for your kind reply.

hi, Ivar, thanks for your kind reply.
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 2012年6月13日 GMT-4 02:42
Hi

you need to reload your files, probably the server was saturated, when we download them they say "0" bytes ;)

--
Good luck
Ivar
Hi you need to reload your files, probably the server was saturated, when we download them they say "0" bytes ;) -- 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