Hello,
I am trying to model a pore in a partial weld. I have attached a small section of the resulting geometry, which includes an ellipsoidal void and what resembles a crack-tip comprising two flat surfaces. I do not find it simple to mesh the surface of the pore and propagate this mesh in the volume with the constraint of the crack tip.
Would anyone have a for webcutting suggestion in order to achieve a good quality hex mesh?
Thank you.
SOUDURE_cubit.stp (769.8 KB)
Hi @Julien,
I think a decomposition like this could work:
That way you can use a polyhedron scheme around the ellipse and then sweep the other parts. Here’s the resulting mesh that this yields:
You could probably improve the mesh quality a bit by uniting all of the parts of the domain that get swept (i.e., everything that is not directly around the ellipse).
To reproduce this, I’ve attached the journal commands below (tested in Cubit 2024.8):
# Create a few reference verts to make applying some transformations easier
create vertex location between location vertex 19 location vertex 20
Vertex 23 copy move y -0.1
Vertex 20 copy move y -0.1
Vertex 25 copy rotate 90 about vertex 24 23
# Remove small surface
remove surface 13 extend
# Decompose the domain
webcut volume 1 with plane xplane offset -68.925
webcut volume 2 with plane vertex 27 vertex 19 vertex 24
webcut volume 3 2 with plane vertex 23 vertex 24 vertex 26
# Add a construction plane to perform some webcuts
create planar surface with plane vertex 24 23 27
move Surface 60 normal to surface 60 distance 0.2 include_merged
webcut volume 3 4 with plane from surface 60
move Surface 60 normal to surface 60 distance -0.4 include_merged
webcut volume 2 5 with plane from surface 60
# Add a second plane to cut near the top of the ellipse
Vertex 39 copy move y -0.1
rotate Vertex 102 angle 90 about vertex 39 27 include_merged
create planar surface with plane vertex 102 43 44
webcut volume 2 9 with plane from surface 101
# Remove the construction planes
delete volume 11
delete volume 6
# Cut vertically
webcut volume all with plane yplane offset 0.2
# Imprint and merge
imprint all
merge surface all
# Set the element size
surface all size 0.02
volume all size 0.02
# Mesh the part around the ellipse
volume 12 7 8 5 scheme polyhedron
mesh volume 12 7 8 5
# Mesh the rest of the front faces
surface 112 104 118 100 63 75 18 scheme pave
mesh surface 112 104 118 100 63 75 18
# Sweep the front regions
volume 2 9 13 10 3 4 1 redistribute nodes on
volume 2 scheme Sweep source surface 104 target surface 140 sweep transform translate propagate bias
volume 9 scheme Sweep source surface 112 target surface 198 sweep transform translate propagate bias
volume 13 scheme Sweep source surface 118 target surface 228 sweep transform translate propagate bias
volume 10 scheme Sweep source surface 100 target surface 210 sweep transform translate propagate bias
volume 3 scheme Sweep source surface 63 target surface 148 sweep transform translate propagate bias
volume 4 scheme Sweep source surface 75 target surface 158 sweep transform translate propagate bias
volume 1 scheme Sweep source surface 18 target surface 120 sweep transform translate propagate bias
volume 2 9 13 10 3 4 1 autosmooth target off
mesh volume 2 9 13 10 3 4 1
# Mesh the back regions
volume 14 16 17 19 15 23 20 18 21 24 22 redistribute nodes on
volume 14 scheme Sweep source surface 120 target surface 16 sweep transform translate propagate bias
volume 16 scheme Sweep source surface 148 target surface 65 sweep transform translate propagate bias
volume 17 scheme Sweep source surface 158 target surface 73 sweep transform translate propagate bias
volume 19 scheme Sweep source surface 178 target surface 67 sweep transform translate propagate bias
volume 15 scheme Sweep source surface 140 target surface 105 sweep transform translate propagate bias
volume 23 scheme Sweep source surface 218 target surface 107 sweep transform translate propagate bias
volume 20 scheme Sweep source surface 188 target surface 79 sweep transform translate propagate bias
volume 18 scheme Sweep source surface 168 target surface 95 sweep transform translate propagate bias
volume 21 scheme Sweep source surface 198 target surface 114 sweep transform translate propagate bias
volume 24 scheme Sweep source surface 228 target surface 116 sweep transform translate propagate bias
volume 22 scheme Sweep source surface 210 target surface 97 sweep transform translate propagate bias
volume 14 16 17 19 15 23 20 18 21 24 22 autosmooth target off
mesh volume 14 16 17 19 15 23 20 18 21 24 22
# Delete construction vertices
delete vertex 23 24 25 26 102
Have a nice day 
Pat
Hi Pat,
Wow, that was fast! Thank you, I have tested it, it is quite good, your strategy is definitely better than what I had tried. With a few minor tweaks, I’ll be able to use it for my analysis.
Thanks again,
Julien