I repeated your creation mode and it worked ok. (with a split of the circle
in three parts, and a collapse to join the midpart)
Maybe the problem while splitting the surface is a corrected bug of your GiD
version (use help-About to see your version).
Try to download the last available beta version 7.5.8b (the password is the
same for all 7.x versions)
http://www.gidhome.com/download/do07.subst
Also are possible other options, instead to use split , for example:
a ) For planar shapes, as your case, can delete the surface and create two
new surfaces selecting his boundary (and hole) lines
b) For non planar shapes it is not sufficient the boundary to reconstruct
the same internal shape, but can create a new surface trimming this shape
Geometry-Create-Nurbs surface-Trimmed
select the surface to get his shape, and the trimmed boundary (and
hole/s) lines.
Then can delete the old surface
Note: in general is not recommended to use GiD boolean operations, it can be
slow and unstable. For example in your case it is possible to create a
planar ring, and create the cylinder ring volume by extrusion with a
translacion transform (from the copy window)
Regards
Enrique Escolano
----- Original Message -----
From: “Thorsten Steinmetz” thorsten.steinmetz at hsu-hh.de
To: gidlist at gatxan.cimne.upc.edu
Sent: Thursday, May 26, 2005 9:10 AM
Subject: WG: {SPAM?} [GiDlist] {SPAM?} WG: Mesh generation problems
Dear Enrique Escolano,
I’m still having problems with the geometry. Could you tell me please, how
did you model the geometry? I tried to create three cylinders:
1) base 0 0 0, radius 3, height 1
2) base 0 0 1, radius 2, height 1
3) base 0 0 1, radius 1, height 1
all orientated along positive z-direction and each in an own layer. Then I
created the cylinder with the hole by the volume boolean operation
substract
(cyl2 - cyl3) and sent the inner surface of the resulting cylinder with
hole
which was still in the layer of cylinder 3 to the layer of cylinder 2.
Trying what you told me in your last mail with that geometry did not work,
as the top surface of cyl1 disappeared after splitting it. However, if I
tried to generate a mesh with this geometry, the error
“19 Check self intersections, or bad oriented boundary”
was reported by GiD.
May it be that I do anything wrong during the geometry modelling?
Thank you for your help,
yours sincerely,
Thorsten Steinmetz.
-----Ursprüngliche Nachricht-----
Von: gidlist-admin at gatxan.cimne.upc.edu
[mailto:gidlist-admin at gatxan.cimne.upc.edu]Im Auftrag von Enrique
Escolano
Gesendet: Mittwoch, 25. Mai 2005 23:10
An: gidlist at gatxan.cimne.upc.edu
Betreff: Re: {SPAM?} [GiDlist] {SPAM?} WG: Mesh generation problems
You must split the top (radius 3) surface, to create 3 parts: two rings
and
a circle
menu: Geometry-Edit-Divide-Surfaces-Split
and select the surface, and the lines to split in two parts
The middle ring must be shared between the two volumes (must delete a
duplicated)
(for example wiht Utilities-Collapse-Model)
or delete this common surface to create a single volume.
I attach a sample
Regards
Enrique Escolano
----- Original Message -----
From: “Thorsten Steinmetz” thorsten.steinmetz at hsu-hh.de
To: gidlist at gatxan.cimne.upc.es
Sent: Wednesday, May 25, 2005 7:09 PM
Subject: {SPAM?} [GiDlist] {SPAM?} WG: Mesh generation problems
Dear GiD-Team,
I am wondering, if there is any possiblity to get a finite-element mesh
of
the following geometry:
I have one cylinder with radius 3m on whose top is another with radius
2m
which has a cylindrical hole (coaxial), which has the radius 1m, see the
attached picutre. My problem is that I cannot generate a mesh at the
touching interface of the big cylinder and the cylinder with the hole
that
uses the same nodes for both surface meshes. I am using GiD 7.5.8b
professional version. Thanks a lot in advance for any help.
Yours,
Thorsten Steinmetz.
-------------------------------------------------------------------
Dipl.-Ing. Thorsten Steinmetz
Helmut-Schmidt-University
University of the Federal Armed Forces Hamburg
School of Electrical Engineering
Theory of Electrical Engineering and Computational Electromagnetics
Holstenhofweg 85
D-22043 Hamburg
Tel.: +49 (0)40 / 6541-2149
Fax : +49 (0)40 / 6541-3764
eMail: thorsten.steinmetz at hsu-hamburg.de
