Meshing a truncated cone with high "area ratio"

Discussion about meshing issues.

Meshing a truncated cone with high "area ratio"

Postby lufti07 » Fri Jan 31, 2014 7:40 am

Hi,

I am trying to mesh a truncated cone with high "area ratio" (meaning the top radius is much smaller than the base radius).
When I mesh it like a Partial Sphere (http://www.csimsoft.com/partialsphere.jsp), the very high width of the cells in the outer region at the cone base are nonsatisfying:

create frustum height 5e-1 radius 5e-1 top 2e-2
create Cylinder height 5e-1 radius 2e-2
webcut volume 1 with sheet extended from surface 4
delete Volume 2
webcut volume 1 with general plane yz noimprint nomerge
volume all size auto factor 2
imprint all
merge all
mesh vol all

What would be the best way for meshing this geometry with hex cells of similar size?
It would be great if somebody has an idea. Thanks a lot. :)

Edit:
Additionally, it would be possible (or even desired) if the cells are getting smaller from the base towards the truncated tip (but of course not with the large ratio of base and top radius).
lufti07
 
Posts: 3
Joined: Thu Jan 30, 2014 7:19 am

Re: Meshing a truncated cone with high "area ratio"

Postby corey_ernst » Thu Feb 06, 2014 9:44 am

How about an approach like this:

reset
create frustum height 0.5 radius 0.5 top 0.02
webcut volume all xplane
webcut volume all yplane
delete volume all except 1
composite create surface 14 13
volume 1 scheme tetprimitive
mesh volume 1
volume all copy reflect plane yplane
volume all copy reflect plane xplane
merge all

--Corey
corey_ernst
 
Posts: 10
Joined: Tue Jan 07, 2014 4:27 pm

Re: Meshing a truncated cone with high "area ratio"

Postby lufti07 » Thu Feb 06, 2014 10:07 am

Thanks for your reply.
When I change the top-radius to 0 (i.e. a non-truncated cone), it looks really good - thanks. But unfortunately with the top 0.02, I get:
Command: mesh volume 1
ERROR: Vertex 11 on surface 12 has type s, but corner picking chose type e.
ERROR: Vertex 11 on surface 15 has type s, but corner picking chose type e.
ERROR: Matching intervals <<< UNSUCCESSFUL >>>
ERROR: Interval assignment unsuccessful.
ERROR: Skipping meshing, since matching intervals failed.

Any idea why?
lufti07
 
Posts: 3
Joined: Thu Jan 30, 2014 7:19 am

Re: Meshing a truncated cone with high "area ratio"

Postby corey_ernst » Thu Feb 06, 2014 11:13 am

Looks like Trelis 14.0.5 is getting hung up on the vertices at the tip. Try compositing them away like so:

reset
create frustum height 0.5 radius 0.5 top 0.02
webcut volume all xplane
webcut volume all yplane
delete volume all except 1
composite create surface 14 13
composite create curve 3 21
composite create curve 16 17
volume 1 scheme tetprimitive
mesh volume 1
volume all copy reflect plane yplane
volume all copy reflect plane xplane
merge all
corey_ernst
 
Posts: 10
Joined: Tue Jan 07, 2014 4:27 pm

Re: Meshing a truncated cone with high "area ratio"

Postby lufti07 » Thu Feb 06, 2014 11:15 am

Actually, I think the approach with a tetprimitive-meshed quarter of non-truncated cone is really the solution.
I am going to try cutting a cylinder with the size of the top and additionally four blocks along the axes. In this case there will be just four of the mentioned quarters left. I will add the journal if I succeed. Thanks again.
lufti07
 
Posts: 3
Joined: Thu Jan 30, 2014 7:19 am


Return to Meshing

Who is online

Users browsing this forum: No registered users and 1 guest

cron

Search / Mark

User Control Panel

Login

Who is online

In total there is 1 user online :: 0 registered, 0 hidden and 1 guest (based on users active over the past 5 minutes)
Most users ever online was 58 on Mon Jun 26, 2017 4:19 pm

Users browsing this forum: No registered users and 1 guest