[Gmsh] Small dimension objects from CAD software - mesh generation problem

[Jean-François Remacle]

Le 20 mars 2013 à 08:18, Matija Mraovic <matija.mraovic at guest.arnes.si> a écrit :

> What do you mean that volume is not closed? How should i do it correctly? Sorry, i am very new in this.
> 
I have not fully analyzed your geometry. It seems that your volume was not composed
of faces that actually close the volume.

I have first "unrolled" your geometry by saving it as a new .geo.

I have removed your volume and added one using the GUI. 
>  
> Yes, there are a lot of elements... Now i'm trying to split the vertical lines and try to mesh just the vertical faces more finely.
> 
you could also extrude the 2D mesh.

> Since most of the FEM action is going on between the electrodes. I'm thinking to simply split the vertical lines by inserting one
> 
> more middle point and mesh it very fine. 
> 
>  
> Thank you for the help.
> 
> mm
> 
>  
>  
> 19.03.2013 17:19, je Jean-François Remacle napisal
> 
>> 
>> Le 18 mars 2013 à 18:25, Matija Mraovic <matija.mraovic at guest.arnes.si> a écrit :
>> 
>>> Hi,
>>> 
>>>  
>>> There are two files:
>>> 
>>> -plane.geo is just a definition file included in extruded.geo
>>> 
>>> -extruded.geo is the 3d geometry i would like to mesh.
>>> 
>>>  
>>> The "extruded.geo" file is the right one, "plane.geo" is just a planar geometry, which i am then extruding to
>>> 
>>> certain z-value (height) in extruded.geo. It seems to me you were making 2d mesh, i'm trying to make 3d (extruded.geo).
>>> 
>>>  
>>> The plane under the electrodes is substrate (plastic, foil...) on which electrodes are actually printed. I want to calculate
>>> 
>>> how the capacity of capacitor changes when substrate is changed. So basically it should be as near as possible to electrodes,
>>> 
>>> but not on the same plane as electrodes. Now, I have placed it at -1e-6 on z-axis and electrodes are at 0.0. Then I extrude
>>> 
>>> electrodes up to 0.01mm, and substrate down to -0.06mm. I also extrude the large bottom plane so it forms a big cube - this is the
>>> 
>>> surrounding air.
>>> 
>> The 3D geometry is incorrect.  The volume is not closed. Here is a correct version of it.
>> Note that the mesh sizes you define produce a 3D mesh of about 9
>  
>  
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------------------------------------------------------------------
Prof. Jean-Francois Remacle
Universite catholique de Louvain (UCL)
Ecole Polytechnique de Louvain (EPL) - Louvain School of Engineering
Institute of Mechanics, Materials and Civil Engineering (iMMC)
Center for Systems Engineering and Applied Mechanics (CESAME)
Tel : +32-10-472352 -- Mobile : +32-473-909930 

 





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