[GiDlist] Fwd: Meshing curved volumes: Mesh conforms with th

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amit Dhankhar

[GiDlist] Fwd: Meshing curved volumes: Mesh conforms with th

Postby amit Dhankhar » Mon Dec 01, 2014 6:20 pm

Thank you for your help Enrique. I notice that when I'm meshing this
volume, mesh always aligns with the 'line' that was rotated to create the
volume. For example, this volume - (created by rotating the arc by 180 deg
twice)-

[image: Inline image 1][image: Inline image 2]

Here's the mesh for the same (default unstructured mesh)-

[image: Inline image 3]
The mesh 'aligns' with the line that separates the two curved surfaces. Is
there a way for the GID mesher to mesh more freely without any constraints?

Thanks!
Amit

On Mon, Nov 17, 2014 at 2:48 PM, Enrique Escolano escolano at cimne.upc.edu
wrote:

I rebuild your shape avoiding the parametrization problems of your model
and it could be meshed without problems.



You have created the extruded surface rotating a curve 180º that cross
the rotation axis,

I created the same shape, but dividing the curve and deleting half part,
and rotating 360º.



If fact it will be less problematic creating two surfaces not closed (with
a rotation of 180º and multiple copies=2 in the copy window)



And the lower plane will be less problematic creating a planar surface by
its boundary, avoiding the creation by rotation



(the poles of a surface of rotation are problematic, because this
degenerated points have zero derivative in one parametric direction)



Enrique



*De:* gidlist-bounces at listas.cimne.upc.edu [mailto:
gidlist-bounces at listas.cimne.upc.edu] *En nombre de *amit Dhankhar
*Enviado el:* lunes, 17 de noviembre de 2014 18:52
*Para:* gidlist at listas.cimne.upc.edu
*Asunto:* [GiDlist] Fwd: Meshing curved volumes



Hi Enrique,

Would you suggest trying out some other version for GID for the meshing
issue of the curved geometry I created?

Thanks!



On Thu, Nov 13, 2014 at 10:40 AM, amit Dhankhar amit12kd at gmail.com
wrote:

Hi,

I tried the repair geometry option which just says "everything was ok" but
fails to mesh. I created my volume by rotating a 2-d curved surface about
its own axis. (which retains the original 2-d surface and creates extra
points and lines which I have to collapse later)

I have attached a zip file containing the simple model -
"nov13_curvedvol_original.gid" - volume created by the rotation which GID
fails to mesh. Could you tell me what else could be wrong in this one? I am
running 12.1.1d version of GID.

In another attempt, "nov13_curvedvol_mod.gid" - I wanted to get rid of
extra surfaces, lines and points so I deleted the original 2-d surface and
the extra lines and tried reconstructing the volume which gives out an
error. This file just has the curved surface and it's base surface (which
ideally should represent a bounded domain)

Thanks



On Mon, Nov 10, 2014 at 12:26 PM, Enrique Escolano escolano at cimne.upc.edu
wrote:

Try to fix some geometrical problem with Utilities-Repair

Try to set all default meshing option. In utilities preferences meshing
press the Reset button



If it continue without mesh trying a reasonable mesh size then attach a
zip with your model to have a look



Enrique



*De:* gidlist-bounces at listas.cimne.upc.edu [mailto:
gidlist-bounces at listas.cimne.upc.edu] *En nombre de *amit Dhankhar
*Enviado el:* viernes, 7 de noviembre de 2014 20:32
*Para:* gidlist at listas.cimne.upc.edu
*Asunto:* [GiDlist] Meshing curved volumes



Hi,

I am trying to mesh a simple geometry of the form of a spherical cap (
created by rotating an arc about its axis) but GID shows up some meshing
error. Creating spherical caps from boolean operations don't work either.

Here's how my geometry looks like-

[image: Inline image 1]



It was created by rotating this surface around it own axis (bounded by an
arc and a line)-

[image: Inline image 2]


As we can see, it shows up error saying 'two faces intersect'. Is there
any other way to mesh such volumes?

Thanks,

Amit



_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist





_______________________________________________
GiDlist mailing list
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http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist


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User avatar
escolano
Posts: 1557
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] Fwd: Meshing curved volumes: Mesh conforms with th

Postby escolano » Mon Dec 01, 2014 6:28 pm

You can use the ‘Rjump’ mesher for surfaces (Utilities-Preferences – Meshing)

This allow GiD to jump the curves between surfaces if there are smooth enough.



It is possible to set this ‘global surface mesher’ variable, or set the ‘jump’ meshing information only for some selected curves

Mesh-Mesh criteria-Skip





De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de amit Dhankhar
Enviado el: lunes, 1 de diciembre de 2014 18:21
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] Fwd: Meshing curved volumes: Mesh conforms with the line of rotation



Thank you for your help Enrique. I notice that when I'm meshing this volume, mesh always aligns with the 'line' that was rotated to create the volume. For example, this volume - (created by rotating the arc by 180 deg twice)-

Inline image 1Inline image 2

Here's the mesh for the same (default unstructured mesh)-

Inline image 3

The mesh 'aligns' with the line that separates the two curved surfaces. Is there a way for the GID mesher to mesh more freely without any constraints?

Thanks!

Amit



On Mon, Nov 17, 2014 at 2:48 PM, Enrique Escolano escolano at cimne.upc.edu wrote:

I rebuild your shape avoiding the parametrization problems of your model and it could be meshed without problems.



You have created the extruded surface rotating a curve 180º that cross the rotation axis,

I created the same shape, but dividing the curve and deleting half part, and rotating 360º.



If fact it will be less problematic creating two surfaces not closed (with a rotation of 180º and multiple copies=2 in the copy window)



And the lower plane will be less problematic creating a planar surface by its boundary, avoiding the creation by rotation



(the poles of a surface of rotation are problematic, because this degenerated points have zero derivative in one parametric direction)



Enrique



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de amit Dhankhar
Enviado el: lunes, 17 de noviembre de 2014 18:52
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Fwd: Meshing curved volumes



Hi Enrique,

Would you suggest trying out some other version for GID for the meshing issue of the curved geometry I created?

Thanks!



On Thu, Nov 13, 2014 at 10:40 AM, amit Dhankhar amit12kd at gmail.com wrote:

Hi,

I tried the repair geometry option which just says "everything was ok" but fails to mesh. I created my volume by rotating a 2-d curved surface about its own axis. (which retains the original 2-d surface and creates extra points and lines which I have to collapse later)

I have attached a zip file containing the simple model - "nov13_curvedvol_original.gid" - volume created by the rotation which GID fails to mesh. Could you tell me what else could be wrong in this one? I am running 12.1.1d version of GID.

In another attempt, "nov13_curvedvol_mod.gid" - I wanted to get rid of extra surfaces, lines and points so I deleted the original 2-d surface and the extra lines and tried reconstructing the volume which gives out an error. This file just has the curved surface and it's base surface (which ideally should represent a bounded domain)

Thanks



On Mon, Nov 10, 2014 at 12:26 PM, Enrique Escolano escolano at cimne.upc.edu wrote:

Try to fix some geometrical problem with Utilities-Repair

Try to set all default meshing option. In utilities preferences meshing press the Reset button



If it continue without mesh trying a reasonable mesh size then attach a zip with your model to have a look



Enrique



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de amit Dhankhar
Enviado el: viernes, 7 de noviembre de 2014 20:32
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Meshing curved volumes



Hi,

I am trying to mesh a simple geometry of the form of a spherical cap ( created by rotating an arc about its axis) but GID shows up some meshing error. Creating spherical caps from boolean operations don't work either.

Here's how my geometry looks like-

Inline image 1



It was created by rotating this surface around it own axis (bounded by an arc and a line)-

Inline image 2


As we can see, it shows up error saying 'two faces intersect'. Is there any other way to mesh such volumes?

Thanks,

Amit



_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist






_______________________________________________
GiDlist mailing list
GiDlist at listas.cimne.upc.edu
http://listas.cimne.upc.edu/cgi-bin/mailman/listinfo/gidlist



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