Yes, the volume created after ‘by contour surfaces’ is similar that the one
created during the extrusion, without the related size limitation
that try to avoid the creation of invalid zero size volumes that can’t be
meshed (for example in case of creation of a copy with translation=0,0,0)
In general is recommended to work with model sizes not very small or very
large, because several algorithms depends on tolerances, and also to have
less numerical rounding error.
It is possible to generate the model with a ‘close to one size’ and finally
scale the model (Move-Scale) to set the unit size required for the
calculation.
Enrique
De:
gidlist-bounces at listas.cimne.upc.edu
[mailto:
gidlist-bounces at listas.cimne.upc.edu] En nombre de Manish Roy
Enviado el: lunes, 2 de septiembre de 2013 18:08
Para:
gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] Extrusion - surface to volume
Hello Enrique,
Thanks for your reply. I could generate the volume by executing Geometry |
Create | Volume | By Contour command from the 6 surfaces generated by the
Utilities | Copy (surface to volume extrusion) command (which originally
failed to generate the volume due to the absolute tolerance mentioned in
your reply). Do you think the generated volume will correctly represent my
geometry?
It is important for me to work with such small volume with a large unit of
measurement (meter).
Thanks,
Manish
_____
From:
gidlist-bounces at listas.cimne.upc.edu
[
gidlist-bounces at listas.cimne.upc.edu] on behalf of Enrique Escolano
[
escolano at cimne.upc.edu]
Sent: Monday, September 02, 2013 5:00 AM
To:
gidlist at listas.cimne.upc.edu
Subject: Re: [GiDlist] Extrusion - surface to volume
Hello Manish,
You are right, the extruded volume is not created now if its volume size is
smaller than 1e-7 units (and in this case the volume is 2.05e-9)
We will fix it for next GiD versions using a relative tolerance (relative to
some the model size) instead an absolute tolerance
Enrique Escolano
De:
gidlist-bounces at listas.cimne.upc.edu
[mailto:
gidlist-bounces at listas.cimne.upc.edu] En nombre de Manish Roy
Enviado el: sábado, 31 de agosto de 2013 20:35
Para:
gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Extrusion - surface to volume
Hello,
I am trying to generate a volume by extruding a surface using the Utilities
|
Copy command in Atena Science Static (v4.3.1)-GiD (v11.0) interface. But
the volume is not getting generated after executing the command; only 5 new
surfaces, 8 new lines, and 4 new points are generated. The opposite two
corners of the original rectangular surface are (0,0) and (0.00127,0.00127)
in meter and it is extruded in the Z-direction by 0.00127 m.
Interestingly, when the surface is much bigger (the opposite corners are
(0,0) and (0.1,0.1) in meter) and the extrusion distance is 0.1 m in the
Z-direction, the volume is generated. I was wondering if there is any
dimensional restriction in creating a geometry in GiD.
Thank you for your time.
Regards,
Manish
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