[GiDlist] Unstructured Meshing - Cordal Error

[Philippe Bouchilloux]

Hello:

I have been experimenting a little with the "Assign unstruct. meshing | By
cordal error" command and I do not quite understand its behavior.

To simplify matters, I am using a simple 2D disk for the geometry. I start
with a cordal error value C and I obtain an unstructured mesh. Then, I
assign a value c C for the cordal error. I remesh, and the mesh becomes
denser, as expected.

Now, if I assign the cordal error back to C, and if I re-mesh, then the
mesh remains the same instead of becoming coarse again, as I was expecting.

Am I doing something wrong?

Thanks!

Philippe


Magsoft Corporation
Tel: 518-271-1352
Cell: 518-365-0421 (direct)
www.magsoft-flux.com

[Enrique Escolano]

The utilities to assign automatic sizes (by cordal error, by geom) or to
automatic correct sizes,
not change an entity size if this entity has a previous assigned size more
small. (not increase previous assigned sizes).

To set a greater cordal error, it is needed to use "Reset mesh data" to
clear previous assigned sizes, and use then "By cordal error"

This form to act is not a bug, but it can seem not intuitive.

Enrique Escolano

----- Original Message -----
From: "Philippe Bouchilloux" pb at magsoft-flux.com
To: "GiDList" gidlist at gatxan.cimne.upc.es
Sent: Thursday, May 29, 2003 5:53 AM
Subject: [GiDlist] Unstructured Meshing - Cordal Error


Hello:

I have been experimenting a little with the "Assign unstruct. meshing | By
cordal error" command and I do not quite understand its behavior.

To simplify matters, I am using a simple 2D disk for the geometry. I
start
with a cordal error value C and I obtain an unstructured mesh. Then, I
assign a value c C for the cordal error. I remesh, and the mesh becomes
denser, as expected.

Now, if I assign the cordal error back to C, and if I re-mesh, then the
mesh remains the same instead of becoming coarse again, as I was
expecting.

Am I doing something wrong?

Thanks!

Philippe


Magsoft Corporation
Tel: 518-271-1352
Cell: 518-365-0421 (direct)
www.magsoft-flux.com


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[Philippe Bouchilloux]

Hello Enrique:

Thanks for your rapid reply, as usual.

Maybe I am not using the meshing feature in the best way, but it seems to
me that using the "Reset Mesh Data" command is too radical when we are
trying to fine-tune a mesh, because suddenly, we lose all the mesh
information. Maybe it is possible to reset to mesh information for one
specific geometrical entity only, instead than for the complete model at
the same time? But I have not found how.

Your advice is very appreciated. Thanks!

Philippe

Magsoft Corporation
Tel: 518-271-1352
Cell: 518-365-0421 (direct)
www.magsoft-flux.com

[Enrique Escolano]

To unassign only some mesh entity size, assign manually a new unstructured
size = 0 to this entity.

Enrique

----- Original Message -----
From: "Philippe Bouchilloux" pb at magsoft-flux.com
To: gidlist at gatxan.cimne.upc.es
Sent: Thursday, May 29, 2003 4:11 PM
Subject: Re: [GiDlist] Unstructured Meshing - Cordal Error


Hello Enrique:

Thanks for your rapid reply, as usual.

Maybe I am not using the meshing feature in the best way, but it seems to
me that using the "Reset Mesh Data" command is too radical when we are
trying to fine-tune a mesh, because suddenly, we lose all the mesh
information. Maybe it is possible to reset to mesh information for one
specific geometrical entity only, instead than for the complete model at
the same time? But I have not found how.

Your advice is very appreciated. Thanks!

Philippe

Magsoft Corporation
Tel: 518-271-1352
Cell: 518-365-0421 (direct)
www.magsoft-flux.com


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[Philippe Bouchilloux]

Thanks, Enrique and sorry for that silly question. I know (for having read
it long time ago) that the answer is in the manual.

Philippe

To unassign only some mesh entity size, assign manually a new unstructured
size = 0 to this entity.

Magsoft Corporation
Tel: 518-271-1352
Cell: 518-365-0421 (direct)
www.magsoft-flux.com