[GiDlist] Meshing volumes with curved surfaces

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amit Dhankhar

[GiDlist] Meshing volumes with curved surfaces

Postby amit Dhankhar » Thu Nov 06, 2014 12:44 am

Hi,

I am trying to create a mesh for a volume with a curved surface. I am
having the following geometry which I created via rotating 3-point arc by
180 deg (so basically I am having 1 complete cylinder + a spherical cap
which is a small part of a sphere + rest of the body)

[image: Inline image 1]
I created this geometry by rotating the following by 180 deg about its axis-

[image: Inline image 2]

But GID fails to create a mesh, displaying an error saying faces intersect
as shown below (which I don't think they do)

[image: Inline image 3]

Is there a way to get around this to mesh curved volumes in GID? Basically
my goal is to represent a curved crack front which I am representing via
the spherical cap.

Thanks!
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amit Dhankhar

[GiDlist] Specifying mesh orientation in GID

Postby amit Dhankhar » Fri Nov 07, 2014 9:00 am

Hi,

Do we have a control over the orientation of tetrahedral mesh elements
created by GID. As I see, GID creates a specific orientation of the
tetrahedral elements by default. ( Referring to structured mesh only)
For example, GID creates the following mesh when I mesh it with tetrahedral
elements.

[image: Inline image 1]

As we can see, the orientation of elements changes around the mid-plane of
the geometry. Is there a way to change this orientation and have a more
consistent one like in the figure below-


[image: Inline image 2]

There is one other 'setting' under preferences of structured mesher in GID
which doesn't help either.

Thanks!
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User avatar
escolano
Posts: 1593
Joined: Thu Sep 18, 2014 3:31 pm

[GiDlist] Specifying mesh orientation in GID

Postby escolano » Fri Nov 07, 2014 10:10 am

It is not possible to control the ‘splitting diagonal’ of structured triangles or tetrahedral.



The only think that you can do is to set the flag ‘Symmetrical structured’ for Tetrahedra (in meshing preferences), then an extra node is create in the center of the ‘structured box’ and then the mesh become more symmetrical.



E.g. for example, in case of triangles without and with symmetrical flag:





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 9:01
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Specifying mesh orientation in GID



Hi,

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)
For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-


Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

Thanks!

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User avatar
abelcs
Posts: 140
Joined: Mon Oct 13, 2014 9:14 am

[GiDlist] Specifying mesh orientation in GID

Postby abelcs » Fri Nov 07, 2014 10:11 am

Hello,



Unfortunatelly you cannot control the orientation of the structured tetras. The only option is to set the ‘Symetrical structured’ option in the Preferences-Meshing window, which will lead to a different configuration of tetras which is symmetrical. In the other hand, it produces a higher number of elements.



Regards,



ABEL





_________________________________

Dr. Abel Coll Sans

CIMNE - International Center for Numerical Methods in Engineering

Ofice c-2, C1 building - Campus Nord UPC

Gran Capità s/n, 08034 Barcelona

T: 34 - 93 401 74 03 Fax: 34 - 93 40 65 17

_____



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de amit Dhankhar
Enviado el: viernes, 07 de noviembre de 2014 9:01
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Specifying mesh orientation in GID



Hi,

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)
For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-


Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

Thanks!

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amit Dhankhar

[GiDlist] Specifying mesh orientation in GID

Postby amit Dhankhar » Fri Nov 07, 2014 10:30 am

Thank you for the information. I wouldn't need an extra node.

I was just wondering why GID prefers one diagonal over the other for some
element and the other oriented diagonal for some other element, is this
rule arbitrary or is there a
built in predictive algorithm?

Thanks!
On Nov 7, 2014 3:12 AM, "Enrique Escolano" escolano at cimne.upc.edu wrote:

It is not possible to control the ‘splitting diagonal’ of structured
triangles or tetrahedral.



The only think that you can do is to set the flag ‘Symmetrical structured’
for Tetrahedra (in meshing preferences), then an extra node is create in
the center of the ‘structured box’ and then the mesh become more
symmetrical.



E.g. for example, in case of triangles without and with symmetrical flag:



*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 9:01
*Para:* gidlist at listas.cimne.upc.edu
*Asunto:* [GiDlist] Specifying mesh orientation in GID



Hi,

Do we have a control over the orientation of tetrahedral mesh elements
created by GID. As I see, GID creates a specific orientation of the
tetrahedral elements by default. ( Referring to structured mesh only)
For example, GID creates the following mesh when I mesh it with
tetrahedral elements.

[image: Inline image 1]

As we can see, the orientation of elements changes around the mid-plane of
the geometry. Is there a way to change this orientation and have a more
consistent one like in the figure below-


[image: Inline image 2]

There is one other 'setting' under preferences of structured mesher in GID
which doesn't help either.

Thanks!

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


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User avatar
abelcs
Posts: 140
Joined: Mon Oct 13, 2014 9:14 am

[GiDlist] Specifying mesh orientation in GID

Postby abelcs » Fri Nov 07, 2014 10:57 am

Hello,



It is based in the nodes numbering in the moment of the mesh generation, so the user has no control on it.



ABEL





_________________________________

Dr. Abel Coll Sans

CIMNE - International Center for Numerical Methods in Engineering

Ofice c-2, C1 building - Campus Nord UPC

Gran Capità s/n, 08034 Barcelona

T: 34 - 93 401 74 03 Fax: 34 - 93 40 65 17

_____



De: gidlist-bounces at listas.cimne.upc.edu [mailto:gidlist-bounces at listas.cimne.upc.edu] En nombre de amit Dhankhar
Enviado el: viernes, 07 de noviembre de 2014 10:30
Para: gidlist at listas.cimne.upc.edu
Asunto: Re: [GiDlist] Specifying mesh orientation in GID



Thank you for the information. I wouldn't need an extra node.

I was just wondering why GID prefers one diagonal over the other for some element and the other oriented diagonal for some other element, is this rule arbitrary or is there a
built in predictive algorithm?

Thanks!

On Nov 7, 2014 3:12 AM, "Enrique Escolano" escolano at cimne.upc.edu wrote:

It is not possible to control the ‘splitting diagonal’ of structured triangles or tetrahedral.



The only think that you can do is to set the flag ‘Symmetrical structured’ for Tetrahedra (in meshing preferences), then an extra node is create in the center of the ‘structured box’ and then the mesh become more symmetrical.



E.g. for example, in case of triangles without and with symmetrical flag:





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 9:01
Para: gidlist at listas.cimne.upc.edu
Asunto: [GiDlist] Specifying mesh orientation in GID



Hi,

Do we have a control over the orientation of tetrahedral mesh elements created by GID. As I see, GID creates a specific orientation of the tetrahedral elements by default. ( Referring to structured mesh only)
For example, GID creates the following mesh when I mesh it with tetrahedral elements.

Inline image 1

As we can see, the orientation of elements changes around the mid-plane of the geometry. Is there a way to change this orientation and have a more consistent one like in the figure below-


Inline image 2

There is one other 'setting' under preferences of structured mesher in GID which doesn't help either.

Thanks!


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

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