[Gmsh] help: iron sheet with hole.

[Javier Lopez]

Thanks a lot for your help.
Probably it was my fault I might not explained the problem clearly.
The part that I want to mesh is the outside of the iron sheet, oposite as
the example you send me.
For the simulation the air flow between the limits and the iron sheet. Is
like the a square pipe that in one side has holes on it.

Thanks a lot again for your help, it was very useful

Javier


2013/2/12 Ruth V. Sabariego <r.sabariego at ulg.ac.be>

> Hi Javier,
>
> I've modified your geometry so that you see how to include the holes,
> whether you consider  a volume sheet or a surface.
> The idea is that all the basic geometrical entities are embedded in the
> rest.
> You can use extrusion, as you did, but carefully: you should avoid
> defining lines/surfaces that will re-appear when extruding. That's asking
> for troubles when meshing.
>
> The attached file contains only the volume iron sheet with holes, the rest
> is yet to be connected.
>
> HTH,
> Ruth
>
>
>
>
>
> On 11 Feb 2013, at 14:25, Javier Lopez <lopez.zozaya at gmail.com> wrote:
>
> Hi Roman,
> The iron Sheet volume is not that important, but I tried to mesh without
> that thickness and I have the same problem.
> I will prefer to simulate the system as simple as posible.
>
> Regards,
> Javier
>
> 2013/2/11 Roman Putanowicz <putanowr at l5.pk.edu.pl>
>
>> > Hi,
>> > I'm trying to mesh an iron sheet with several holes on it to see how an
>> air
>> > flow pass through it.
>> > When I manage to mesh both volumes, I  tried simulate the system but the
>> > air flow it dosen't pass through the holes. another times it only mesh
>> the
>> > bottom volume.
>> >
>> > Thanks in advance for your help
>>
>> Hi Javier,
>>
>> Looking at you model my first question is how important is to
>> model the iron sheet as volume? The ratio sheet thickness to the hole
>> radius looks small thus the question is if we can neglect the sheet
>> thickness. I know it can change the flow pattern but on the other
>> hand it can make the mesh generation easier (for the simulation
>> the drawback is the presence of internal boundaries).
>>
>> Regards
>>
>> Roman
>>
>> --
>> Roman Putanowicz, PhD  < putanowr at l5.pk.edu.pl  >
>> Institute for Computational Civil Engng (L-5)
>> Dept. of Civil Engng, Cracow Univ. of Technology
>> www.l5.pk.edu.pl, tel. +48 12 628 2569, fax 2034
>>
>
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>
> —
> Dr. Ir. Ruth V. Sabariego
> University of Liege, Electrical Engineering and Computer Science
> http://ace.montefiore.ulg.ac.be/
>
>
>
>
>
>
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>
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