[Gmsh] Defining Mesh

Mikhail Artemyev artemiev.mikhail at gmail.com
Tue Mar 17 17:00:44 CET 2015


Please, have a look at the tutorial 13 
http://geuz.org/gmsh/doc/texinfo/gmsh.html#t13_002egeo
I think it describes exactly what you want to achieve.

Best,
Mikhail


On 03/17/2015 10:44 AM, Thomas Bernhardt wrote:
> This works if I want the mesh to be as small as the smaller of the 
> meshes across the surface but what if the mesh is too small and I want 
> it to be the size of the larger?
>
> On Tue, Mar 17, 2015 at 9:22 AM, Mikhail Artemyev 
> <artemiev.mikhail at gmail.com <mailto:artemiev.mikhail at gmail.com>> wrote:
>
>     Here is a quick and dirty solution:
>
>     // --- scalpel2.geo ---
>     Merge "scalpel2.step";
>     Mesh.CharacteristicLengthMax = 2;
>     Mesh.Algorithm = 1; // MeshAdapt
>
>     The picture of the mesh I got is attached.
>
>     Best,
>     Mikhail
>
>
>
>     On 03/17/2015 09:54 AM, Thomas Bernhardt wrote:
>>     The original scalpel is present in the .step file and in the .geo
>>     file I have defined one compound surface. My goal is to be able
>>     to have a uniform mesh throughout that compound surface.  The end
>>     goal is to have a process for making uniform meshes across
>>     surfaces that are one surface but divided on a CAD model.  Thanks
>>     for your help.
>>
>>     On Tue, Mar 17, 2015 at 8:46 AM, Mikhail Artemyev
>>     <artemiev.mikhail at gmail.com <mailto:artemiev.mikhail at gmail.com>>
>>     wrote:
>>
>>         Hi Thomas,
>>
>>         If you share that example of a scalpel with Compound Surfaces
>>         that you defined, I can try and show what can be done.
>>
>>         Best,
>>         Mikhail
>>
>>
>>
>>         On 03/17/2015 09:18 AM, Thomas Bernhardt wrote:
>>>         Can you give me an example of how I can change the mesh
>>>         sizes in practice? Where do I change that option?
>>>
>>>         On Thu, Mar 12, 2015 at 9:43 AM, Mikhail Artemyev
>>>         <artemiev.mikhail at gmail.com
>>>         <mailto:artemiev.mikhail at gmail.com>> wrote:
>>>
>>>             Hi Thomas,
>>>
>>>             I would suggest to play with the size of the mesh cells.
>>>             There are several ways:
>>>             http://geuz.org/gmsh/doc/texinfo/gmsh.html#Specifying-mesh-element-sizes
>>>
>>>             Best,
>>>             Mikhail
>>>
>>>
>>>
>>>             On Thu, Mar 12, 2015 at 10:05 AM,
>>>             <gmsh-request at ace20.montefiore.ulg.ac.be
>>>             <mailto:gmsh-request at ace20.montefiore.ulg.ac.be>> wrote:
>>>
>>>                 Hello,
>>>                 In this picture the top is the original mesh of the
>>>                 scalpel. In the bottom
>>>                 I defined some compound surfaces. The mesh changed
>>>                 but the problem is that
>>>                 even in the one compound surface the mesh goes from
>>>                 point to point and is
>>>                 smaller in the areas where there used to be a
>>>                 smaller surface. I would like
>>>                 to be able to have a uniform mesh across surfaces.
>>>                 Does this make the
>>>                 problem clear? Thanks for your help.
>>>
>>>                 On Wed, Mar 11, 2015 at 9:51 AM, David Bernstein <
>>>                 David.Bernstein at meliorinnovations.com
>>>                 <mailto:David.Bernstein at meliorinnovations.com>> wrote:
>>>
>>>                 >  Hi Thomas, I?m sorry but I don?t understand your
>>>                 problem.  It would be
>>>
>>>                 > helpful if you could post a small example.
>>>                 >
>>>                 >  Dave
>>>                 >
>>>                 >   On Mar 10, 2015, at 10:14 AM, Thomas Bernhardt
>>>                 <tzbernhardt at gmail.com <mailto:tzbernhardt at gmail.com>>
>>>                 > wrote:
>>>                 >
>>>                 >  I am finding that I can define a compound surface
>>>                 and instead of a bunch
>>>                 > of separate meshes it treats it as one mesh but
>>>                 the points from the
>>>                 > original surface divisions remain.  So the problem
>>>                 is that the mesh is
>>>                 > defined based on points. The one mesh is the same
>>>                 as the original broken up
>>>                 > meshes. The mesh will still be smaller on the part
>>>                 of the compound surface
>>>                 > that used to be a smaller surface because points
>>>                 are closer together. Any
>>>                 > fix for this? Thanks for your help!
>>>                 >
>>>                 >  Thomas Bernhardt
>>>                 >
>>>                 > On Tue, Mar 10, 2015 at 10:23 AM, David Bernstein <
>>>                 > David.Bernstein at meliorinnovations.com
>>>                 <mailto:David.Bernstein at meliorinnovations.com>> wrote:
>>>                 >
>>>                 >> Hi Thomas, Take a look at the Compound
>>>                 Line/Surface/Volume entities in
>>>                 >> Gmsh. These will probably do what you want.
>>>                 >>
>>>                 >> Regards,
>>>                 >> Dave
>>>                 >>
>>>                 >>
>>>                 >> > On Mar 10, 2015, at 7:42 AM, Thomas Bernhardt
>>>                 <tzbernhardt at gmail.com <mailto:tzbernhardt at gmail.com>>
>>>                 >> wrote:
>>>                 >> >
>>>                 >> > Hello,
>>>                 >> > I am trying to create a mesh in gmsh of a model
>>>                 that I have imported.
>>>                 >> The problem that I find is that every line in the
>>>                 model divides the mesh.
>>>                 >> Is there a way to mesh the whole surface as one
>>>                 body ignoring the lines
>>>                 >> that divide parts. For example on a simple
>>>                 aircraft model there will be a
>>>                 >> line dividing the metal surface from the glass of
>>>                 the cockpit. However,
>>>                 >> when defining a mesh I want to ignore this
>>>                 division and treat it as one
>>>                 >> single surface. Thanks for any help you can provide.
>>>                 >> >
>>>                 >> > Thomas Bernhardt
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>>
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