Howdy all,
I’m back again to wrestle with meshing dome volumes. @gvernon had helped me to a certain point previously in this thread, but the example we ended up on had a flat surface on the bottom which does not match my use case exactly.
I’ll go through an example from geometry generation through to my attempts at meshing to illustrate the issue I’m encountering. Let’s assume I’m trying to make an ellipsoidal end cap for a tube. First, I create the tube:
create cylinder height 24 radius 6
create cylinder height 24 radius 4.5
subtract volume 2 from volume 1
Next, I want to create the end cap with a thickness consistent with the tube but only 4 unit lengths beyond where the tube ends. There are a few ways to do this (and maybe this is where I’m immediately going wrong), but here is the way I figure is easiest to do knowing the desired maximum height:
Create three vertices, one for the maximum outer ellipse height, one for maximum inner ellipse height, and one for ellipse center:
create vertex 0 0 14.5
create vertex 0 0 16
create vertex 0 0 12
Next, I create the curves to define a surface to sweep around the z-axis:
create curve vertex 2 8 9 ellipse
create curve vertex 6 7 9 ellipse
create curve vertex 7 8
create curve vertex 10 11
create surface curve 7 to 10
sweep surface 10 zaxis angle 360
merge all
I now have this shape:
I would like to get folks’ ideas on how to mesh this. To pull from the previous thread, one approach might be to webcut a central cylinder through the dome and split the remaining bit of the dome along the “seam” leftover from constructing the geometry.
webcut volume 3 with cylinder radius 2.5 axis z merge
webcut volume 3 with plane yplane imprint merge
This allows me to easily mesh volumes 3 and 5 by meshing one surface created in the previous cut and sweeping to the other surface for both volumes, but my understanding is that I still have the same problem as before with volume 4 which is to say that I can mesh using Pave on one of the surfaces, but that sweeping from that surface to the one inside (or vice versa) still gives me an error:
surface 19 size 0.5
mesh surface 19
volume 4 redistribute nodes off
volume 4 scheme Sweep source surface 19 target surface 18 sweep transform least squares
volume 4 autosmooth target on fixed imprints off smart smooth off
mesh volume 4
Command: mesh volume 4
ERROR: Inconsistent edge to face count relationship.
ERROR: Mesh of Surface 18 is invalid.
ERROR: No 3d elements.
ERROR: Mesh of Volume 4 is invalid.
ERROR: Volume 4 meshing unsuccessful using scheme: sweep
ERROR: 1 volume did not mesh : Volume 4
Any help would be greatly appreciated!
