# [Gmsh] Defining Mesh

Thomas Bernhardt tzbernhardt at gmail.com
Tue Mar 17 15:18:34 CET 2015

```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> 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
> > 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> 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
>> >
>> > 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> 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
>> >
>> >> 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
>> >> >
>> >> > Thomas Bernhardt
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