Meshing a brick with an embedded sphere

Coreform Cubit Meshing
#1

Hello,

the subject sounds similar to the previous topic “How to mesh a brick chopped with a partail sphere” but the answer there didn’t help me.

I want to mesh a brick with an embedded sphere. The geometry can be this

brick x 10 y 10 z 10
create sphere radius 4
subtract volume 2 from volume 1 imprint
create sphere radius 4

I tried a lot of things already like webcutting it into smaller and smaller pieces but non of them worked. I would be very thankful for help.

It is important that the mesh on the outer surfaces is regular and composed from equally sized rectangles because it part of a larger setup and the mesh has to match the other parts.

Best regards,
Sascha

#2

You could try meshcutting capability. It is still under development but it works for your case. Use it with caution though.

reset
brick x 10 y 10 z 10

create sphere radius 4

subtract volume 2 from volume 1 imprint

create sphere radius 4

webcut volume all plane xplane

webcut volume all plane yplane

webcut volume all plane zplane

delete volume all except 7 8

remove surf 107

mesh vol 7

set developer commands on

meshcut volume 7 sheet surface 117
del vol 8

body all copy reflect x
body all copy reflect y
body all copy reflect z
merge all

Let me know if this works for you.

#3

Here is another way to mesh this problem:

reset
brick x 10 y 10 z 10
create sphere radius 4

note that I used the keep option so I only delete 1 body (this is a personal choice)

subtr vol 2 from 1 keep
del vol 1

core the model so that the central core can be swept down and the

the rest of the volumes can be radially swept

webcut volume all with cylinder radius 1 axis y

Now cut on the symmetry planes. At least 1 symmetry plane is required

for the radial sweep. We need to know where to begin and end.

webcut volume all with plane xplane offset 0
webcut volume all with plane zplane offset 0

I think at this point it is easier to use the symmetry of the model and only work on a quarter of it

del vol 7 to 21
imprint all
merge all

The exterior brick needs a little help to create the mesh

volume 3 scheme sweep source surface 40 target surface 87
mesh vol all

Now reflect the quarter model to create the complete model

volume all copy reflect x
volume all copy reflect z

Finally make sure the reflected interfaces are merged

merge vol all