[Gmsh] Defining Mesh

Mikhail Artemyev artemiev.mikhail at gmail.com
Tue Mar 17 16:22:41 CET 2015


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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>>             > confidential information provided only for the use of
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>>             > entity for whom it was intended. If the reader of this
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