Meshing a torus inside a cube/cylinder?

Coreform Cubit Meshing
#1

Hi,

I’m having trouble generating a hex mesh of a small torus inside a box. I’m unsure of which scheme to use.

I’d also like to use a finer spacing inside the torus and then have it grad outwards towards the cube boundary, but don’t seem to be having much success.

Here’s my attempt… I was trying to do use symmetry and then reflect at the end:

reset
brick x 0.5
torus major radius 0.02 minor radius 0.01
rotate volume 2 angle 90 about y
subtr vol 2 from 1 keep
del vol 1

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

del vol 4 to 17
imprint all
merge all

vol 2 scheme sweep source surface 34 target surface 77
vol 2 size 0.005
vol 3 scheme poly
vol 3 size 0.01
mesh vol all

but this fails to mesh the cube part of the domain

Thanks for any help!

#2

This seems to have done it, but I’d be interested if I could do this more cleanly:

reset
brick x 0.5
torus major radius 0.02 minor radius 0.01
rotate volume all angle 90 about y
subtr vol 2 from 1 keep
del vol 1

Core with cylinder

webcut volume all with cylinder radius 0.005 axis x

Cut into quarters

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

Use symmetry, so disgard all but 1 quarter

del vol 5 to 13
imprint all
merge all

Meshing options:

surf 52 size 0.005
mesh vol 2

vol 4 scheme sweep source surface 65 target surface 35
vol 2 scheme sweep source surface 21 target surface 51
vol 3 size 0.01
vol 4 size 0.05
mesh vol all

Reflect the quarter to create the complete model.

vol all copy reflect y
vol all copy reflect z

Make sure all reflected interfaces are merged.

merge vol all

Thanks

Ross