About the mesh simmetry in a simmetric geometry, as unstructured mesh
is an heuristic algorithm, you can never guarantee that you will obtain
the same mesh although the geometry is simmetric. You cannot even
guarantee that you will obtain the same mesh on two runs of the mesher
in the same geometry. But good analysis codes do not depend on the mesh,
do they?
Regards,
--
Compass Ing. y Sistemas Dr. Ramon Ribo
http://www.compassis.com ramsan at compassis.com
c/ Manuel Girona, 61 bajos tel. +34 93 204 10 82
08034 Barcelona, Spain fax. +34 93 204 19 09
I am not using an unstructured mesh, I am using a structured mesh over a
plane-symmetric and an axisymmetric geometry, and the resulting mesh is
still unsymmetric. I can send the input file for anyone to verify this.
While the analysis program results do not depend on the mesh for a good
analysis code (as is the case here), a truly "good" analysis code will
take advantage of symmetry and axisymmetry and realize a huge time savings
(a factor of 5 for our program with axisymmetry recognized). A good
preprocessor will give symmetric meshes for structured meshing over
symmetric geometry.
[GiDlist] Re: GiDlist digest, Vol 1 #408 - 6 msgs
Moderator: GiD Team
-
Enrique Escolano
[GiDlist] Re: GiDlist digest, Vol 1 #408 - 6 msgs
About your previous mails:
In general with GiD, a symmetric geometry not generate a symmetric mesh, also in structured mesh.
About your round "error rotating the mesh, and a preference to increase this precision."
This is a corrected bug of some version, truncating incorrectly a input value with
the "real format" preference. Internally all operation are in double precision.
Update your GiD version to the last beta.
Enrique Escolano
----- Original Message -----
From: "Jeramy Ashlock" ashlock at bechtel.Colorado.EDU
To: gidlist at gatxan.cimne.upc.es
Sent: Monday, June 23, 2003 5:44 PM
Subject: [GiDlist] Re: GiDlist digest, Vol 1 #408 - 6 msgs
About the mesh simmetry in a simmetric geometry, as unstructured mesh
is an heuristic algorithm, you can never guarantee that you will obtain
the same mesh although the geometry is simmetric. You cannot even
guarantee that you will obtain the same mesh on two runs of the mesher
in the same geometry. But good analysis codes do not depend on the mesh,
do they?
Regards,
--
Compass Ing. y Sistemas Dr. Ramon Ribo
http://www.compassis.com ramsan at compassis.com
c/ Manuel Girona, 61 bajos tel. +34 93 204 10 82
08034 Barcelona, Spain fax. +34 93 204 19 09
I am not using an unstructured mesh, I am using a structured mesh over a
plane-symmetric and an axisymmetric geometry, and the resulting mesh is
still unsymmetric. I can send the input file for anyone to verify this.
While the analysis program results do not depend on the mesh for a good
analysis code (as is the case here), a truly "good" analysis code will
take advantage of symmetry and axisymmetry and realize a huge time savings
(a factor of 5 for our program with axisymmetry recognized). A good
preprocessor will give symmetric meshes for structured meshing over
symmetric geometry.
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist
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In general with GiD, a symmetric geometry not generate a symmetric mesh, also in structured mesh.
About your round "error rotating the mesh, and a preference to increase this precision."
This is a corrected bug of some version, truncating incorrectly a input value with
the "real format" preference. Internally all operation are in double precision.
Update your GiD version to the last beta.
Enrique Escolano
----- Original Message -----
From: "Jeramy Ashlock" ashlock at bechtel.Colorado.EDU
To: gidlist at gatxan.cimne.upc.es
Sent: Monday, June 23, 2003 5:44 PM
Subject: [GiDlist] Re: GiDlist digest, Vol 1 #408 - 6 msgs
About the mesh simmetry in a simmetric geometry, as unstructured mesh
is an heuristic algorithm, you can never guarantee that you will obtain
the same mesh although the geometry is simmetric. You cannot even
guarantee that you will obtain the same mesh on two runs of the mesher
in the same geometry. But good analysis codes do not depend on the mesh,
do they?
Regards,
--
Compass Ing. y Sistemas Dr. Ramon Ribo
http://www.compassis.com ramsan at compassis.com
c/ Manuel Girona, 61 bajos tel. +34 93 204 10 82
08034 Barcelona, Spain fax. +34 93 204 19 09
I am not using an unstructured mesh, I am using a structured mesh over a
plane-symmetric and an axisymmetric geometry, and the resulting mesh is
still unsymmetric. I can send the input file for anyone to verify this.
While the analysis program results do not depend on the mesh for a good
analysis code (as is the case here), a truly "good" analysis code will
take advantage of symmetry and axisymmetry and realize a huge time savings
(a factor of 5 for our program with axisymmetry recognized). A good
preprocessor will give symmetric meshes for structured meshing over
symmetric geometry.
_______________________________________________
GiDlist mailing list
GiDlist at gid.cimne.upc.es
http://gid.cimne.upc.es/mailman/listinfo/gidlist
-------------- next part --------------
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