Page 1 of 1

[GiDlist] bug in mesher

Posted: Mon Aug 05, 2002 11:03 am
by Mark Smith
GiD 6.3.0b win98

Dear GiD team
I have discovered a bug in the unstructured mesher when generating
quadratic tetrahedra.
The mesh looks OK in GiD but here no mid-side nodes are displayed. Using a
routine I convert the quadratic mesh into line elements then re-import
into GiD to display the quadratic mesh, This is when it becomes obvious
that there are errors with the node connectivity. see attached gifs.
The error seems to be mesh parameter dependant, so far I have only found
problems with settings RFast & Smoothing high angle but as I say The
linear mesh displayed in GiD looks OK !!!!
I am also sure that it isn't an error in my routine as looking at the mesh
file shows the wrong node numbering for the offending elements.
Also attached a simple sphere meshing problem which gives the error.

Regards
Mark

P.S. sorry for the resend But I forgot to sign off





Displayed mesh.gif actual quad mesh.gif meshbug.gid.zip


--------------------------------------------------------------------------
Linx Printing Technologies plc
+44 (0)1480302100
http://www.linx.co.uk/
This e-mail may contain privileged/confidential information and may be
read, copied and used only by the intended recipient. If you have received
it in error, please contact the sender by return e-mail or by
telephoning +44 (0)1480 302100.
Please then delete the e-mail and do not disclose its contents to any
person.

Any information in this message that does not relate to the official
business of Linx shall be understood as neither given nor endorsed by Linx.
We reserve the right to monitor all e-mail communications through our
internal and external networks.
--------------------------------------------------------------------------



-------------- next part --------------
A non-text attachment was scrubbed...
Name: Displayed mesh.gif
Type: image/gif
Size: 5770 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20020805/e86e9479/attachment.gif
-------------- next part --------------
A non-text attachment was scrubbed...
Name: actual quad mesh.gif
Type: image/gif
Size: 6410 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20020805/e86e9479/attachment-0001.gif
-------------- next part --------------
A non-text attachment was scrubbed...
Name: meshbug.gid.zip
Type: application/octet-stream
Size: 5503 bytes
Desc: not available
Url : http://listas.cimne.upc.edu/pipermail/gidlist/attachments/20020805/e86e9479/attachment.obj

[GiDlist] bug in mesher

Posted: Wed Aug 28, 2002 6:14 pm
by Enrique Escolano
Thank for your information

This is a problem mapping the midnode over the surface because the element
size is great.
We will try to solve it for the next beta version.

We have added for this version in preferences an option to draw with more
precision the quadratic elements.

Enrique

----- Original Message -----
From: "Mark Smith" mark.smith at linx.co.uk
To: "Gidlist (E-mail)" gidlist at gatxan.cimne.upc.es
Sent: Monday, August 05, 2002 12:04 PM
Subject: [GiDlist] bug in mesher


GiD 6.3.0b win98

Dear GiD team
I have discovered a bug in the unstructured mesher when generating
quadratic tetrahedra.
The mesh looks OK in GiD but here no mid-side nodes are displayed. Using
a
routine I convert the quadratic mesh into line elements then re-import
into GiD to display the quadratic mesh, This is when it becomes obvious
that there are errors with the node connectivity. see attached gifs.
The error seems to be mesh parameter dependant, so far I have only found
problems with settings RFast & Smoothing high angle but as I say The
linear mesh displayed in GiD looks OK !!!!
I am also sure that it isn't an error in my routine as looking at the
mesh
file shows the wrong node numbering for the offending elements.
Also attached a simple sphere meshing problem which gives the error.

Regards
Mark

P.S. sorry for the resend But I forgot to sign off





Displayed mesh.gif actual quad mesh.gif meshbug.gid.zip


--------------------------------------------------------------------------
Linx Printing Technologies plc
+44 (0)1480302100
http://www.linx.co.uk/
This e-mail may contain privileged/confidential information and may be
read, copied and used only by the intended recipient. If you have received
it in error, please contact the sender by return e-mail or by
telephoning +44 (0)1480 302100.
Please then delete the e-mail and do not disclose its contents to any
person.

Any information in this message that does not relate to the official
business of Linx shall be understood as neither given nor endorsed by
Linx.
We reserve the right to monitor all e-mail communications through our
internal and external networks.
--------------------------------------------------------------------------