Mesh Inhomogeneous density Problems

[Manuel Ricardo Perez Cerquera]

Dear Iso2mehs developers! 

I'am facing an issue with my mesh of inhomgeneity in the Tetra size elements. I am using vol2mesh function with 'cgalmesh' method  and with the follow parameters :

opt(1).radbound=40; 

opt(2).radbound=40; 

opt(3).radbound=40;

opt(4).radbound=40;

opt(1).distbound=4; 

opt(2).distbound=4; 

opt(3).distbound=4;

opt(4).distbound=4;

maxvol=4000;

Since I'm considering just 4 tissues. I am getting a mesh with around 50K of elements which fits perfectly in my memory system while I am running my simulator. 

The thing is that I am getting problems in my solver and is because the size of the elements are not homogeneous. For example the image attached show in the red box how in that particular region the elements goes smaller . 

Is there any way to make them roughly of the same size , without Doing the mesh denser. 

Thank you very much for your help.

Regards

Manuel.

--
Eng. Manuel Ricardo Perez Cerquera. MSc. Ph.D student
Antenna and EMC Lab (LACE)
Istituto Superiore Mario Boella (ISMB)
Politecnico di Torino
Via Pier Carlo Boggio 61, Torino 10138, Italy
Email: manuel.per...@polito.it
Phone: +39 0112276704
Fax: +39 011 2276 299

[Qianqian Fang]

On 10/04/2012 07:53 AM, Manuel Ricardo Perez Cerquera wrote:

Dear Iso2mehs developers! 

I'am facing an issue with my mesh of inhomgeneity in the Tetra size elements. I am using vol2mesh function with 'cgalmesh' method  and with the follow parameters :

hi Manuel

unfortunately this is a known issue with CGAL tools (cgalmesh/cgalsurf).

see my filed bug and the follow ups:

https://sympa.inria.fr/sympa/arc/cgal-discuss/2010-11/msg00011.html

opt(1).radbound=40; 

opt(2).radbound=40; 

opt(3).radbound=40;

opt(4).radbound=40;

opt(1).distbound=4; 

opt(2).distbound=4; 

opt(3).distbound=4;

opt(4).distbound=4;

maxvol=4000;

by the way, for cgalmesh, you don't set multiple
values for each levelset. The above setting only
works when you use cgalsurf when extracting
multiple surfaces.

Since I'm considering just 4 tissues. I am getting a mesh with around 50K of elements which fits perfectly in my memory system while I am running my simulator. 

The thing is that I am getting problems in my solver and is because the size of the elements are not homogeneous. For example the image attached show in the red box how in that particular region the elements goes smaller . 

Is there any way to make them roughly of the same size , without Doing the mesh denser.

an "ugly" work-around is to set radbound/distbound to
a set of different values. The dense cluster may move,
and sometimes, disappear. Unfortunately we don't have
much control of this unless someone look into the CGAL
source code.

if you use v2s('cgalsurf')->s2m workflow instead of v2m('cgalmesh'),
you can use meshresample() to remove these dense clusters, see

https://groups.google.com/group/iso2mesh-users/browse_thread/thread/5b1fc42952525521/70a1363e10c64658?hl=enFa1363e10c64658

however, the mesh resample may generate self-intersecting
elements. This will be a problem when running s2m.

Qianqian

Thank you very much for your help.

Regards

Manuel.

--
Eng. Manuel Ricardo Perez Cerquera. MSc. Ph.D student
Antenna and EMC Lab (LACE)
Istituto Superiore Mario Boella (ISMB)
Politecnico di Torino
Via Pier Carlo Boggio 61, Torino 10138, Italy
Email: manuel.per...@polito.it
Phone: +39 0112276704
Fax: +39 011 2276 299

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