[Gmsh] Defining Mesh

Mikhail Artemyev artemiev.mikhail at gmail.com
Tue Mar 17 15:46:16 CET 2015


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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