Meshing of sphere

Discussion about meshing issues.

Meshing of sphere

Postby GIRISHNAIK » Thu Oct 17, 2013 2:48 pm

Hi, I am new user of Cubit 13.1 version. I had a question about meshing using Hexahedral element. I modeled a partial sphere and cut it with cone and I am trying to mesh it with hexahedral element but it shows me volume not map, submap,seepable. If I cut the sphere on between into two halves still it cannot mesh. What should I make changes in design to make it sweepable.

create sphere radius 7.399 ypositive
create frustum height 4.87 radius 5.2 top 0 (cone created)
rotate Volume 2 angle 90 about X include_merged (rotated cone @X axis)
move Volume 2 x 0 y 2.87 z 0 include_merged (moved cone on yaxis)
webcut volume 1 with plane surface 4 (webcut sphere with cone circle)
delete volume 3 (deleted sphere bottom part)
delete volume 2 (deleted cone)
GIRISHNAIK
 
Posts: 3
Joined: Thu Oct 17, 2013 2:31 pm

Re: Meshing of sphere

Postby csimsoft Moderator » Thu Oct 24, 2013 8:12 am

Partial spheres can be hex meshed by decomposing it into sweepable volumes using a cylinder. Try adding the following to your journal file:

#use a cylinder to core the partial sphere
create cylinder height 20 radius 1
rotate volume 4 angle 90 about X include_merged
webcut volume 1 with sheet extended from surface 9
delete volume 4

#cut the remaining partial cylinder into two sweepable volumes
webcut volume 1 with general plane yz

#imprint and merge volumes to ensure a contiguous mesh
imprint all
merge all
mesh volume all
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Re: Meshing of sphere

Postby GIRISHNAIK » Mon Oct 28, 2013 4:53 pm

Hi, Thanks for the earlier reply. Now I ma experiencing another problem after I added a cylinder to sphere and carried out the meshing but it can't mesh volume1 (half spherical part after webcut). I have attached new code

create sphere radius 7.399 ypositive
create frustum height 4.87 radius 5.2 top 0
rotate Volume 2 angle 90 about X include_merged
move Volume 2 x 0 y 2.87 z 0 include_merged
webcut volume 1 with plane surface 4
delete volume 3
delete volume 2
create cylinder height 20 radius 1
rotate volume 4 angle 90 about X include_merged
webcut volume 1 with sheet extended from surface 9
delete volume 4
webcut volume 1 with general plane yz
create Cylinder height 3.0 radius 5.15
rotate Volume 7 angle 90 about X include_merged
align Volume 7 surface 29 with surface 15

Would like to know why it's happening. It is able to mesh volume 6 i.e. other half spherical with sweep meshing scheme but couldn't mesh with sweep scheme.
GIRISHNAIK
 
Posts: 3
Joined: Thu Oct 17, 2013 2:31 pm

Re: Meshing of sphere

Postby csimsoft Moderator » Thu Nov 07, 2013 11:41 am

When I run your journal file the cylinder is overlapping the two partial spheres. Is this what you intended?

sphere.jpg
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Posts: 237
Joined: Tue Feb 14, 2012 5:59 pm
Location: American Fork, UT


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