[Gmsh] Merging Surfaces

[Adam Zabriskie]

Hello Mike,

I don't know if this is what you want, but physical surfaces and volumes is
what I use to tell Gmsh that multiple surfaces should be treated as one.  An
example will probably show better what I mean.  I have a channel with
multiple Ruled Surfaces making up the sides of the channel, but I want the
all the sides to be treated as one wall in OpenFOAM.  So I specify one
physical surface containing each of the Ruled surfaces.  I also specify all
of the volumes inside the channel as one physical volume.  I have found if I
don't do this then OpenFOAM generates a surface cutting my channel and
preventing flow through it.  I don't know if this example will help since it
sounds like you want Gmsh to ignore the lines between surfaces instead of
creating nodes along the line, which is what it does when meshing 1D.
Physical Surfaces do not make Gmsh ignore the lines used to create the
surfaces.  I hope this helps.

Adam Z.

On Wed, Aug 5, 2009 at 5:00 AM, Mike B. <mb78aa at yahoo.com> wrote:

> To clarify my previous message, I build the each surface (patch) going from
> points->lines->line loops->Plane Surface or Ruled Surface. I am not merging
> STL or IGES files.
>
> Cheers and thanks,
> Mike.
>
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