[Gmsh] Volume not meshing after adding embedded surface

[Fariba Rahman]

Hi Christophe,

Thank you for getting back to me.
I tried using *Surface {26} in Volume {5} * code but this did not work to
embed surface 26 into volume 5, but both volume 5 and surface 6 were
completely meshed.
I have tried embedding my surface 26 into the top face of volume 5 using
the following code below, but I still get the same errors:
*Error: Invalid boundary mesh (overlapping facets) on surface 27 surface 26*
*Error: No elements in volume 3 4 5*

Not sure what else I can do to both completely mesh volume 5 and embed
surface 26 into this volume.
I also have a zoomed in screen shot of the volume 5 and surface 26 below
and attached the source for reference.
Any guidance you may have would be greatly appreciated.

Best regards,

Fariba

*Code used to embed surface 26 into volume 5:*
//-------Gate
Contact-------------------------------------------------------------------------//
Line(57) = {37, 40};
Line(58) = {39, 38};

Line Loop(26) = {57, -55, 58, -52};
Plane Surface(26) = {26};
Physical Surface("Gate-Contact") = {26};

//-----------Top surface of AlGaAs Barrier & embed Gate contact in top
face--------//
Curve Loop(27) = {30, 51, 52, 53, 46, 54, 55, 56};
Plane Surface(27) = {27,26};

//------- Other Surfaces of AlGaAs Barrier Region
--------------------------------------------------------//
Curve Loop(28) = {27, 15, -38, -53, -52, -51};
Plane Surface(28) = {28};
//+
Curve Loop(29) = {44, 21, 29, -56, -55, -54};
Plane Surface(29) = {29};
//+
Curve Loop(30) = {28, -21, 45, -15};
Plane Surface(30) = {30};

//------------AlGaAs Barrier Layer Volume---------------//
Surface Loop(5) = {27, 28, 30, 29, 15, 24, 26};
Volume(5) = {5};
Physical Volume("AlGaAs Barrier Layer") = {5};

[image: image.png]


On Wed, Nov 4, 2020 at 2:55 AM Christophe Geuzaine <cgeuzaine at uliege.be>
wrote:

>
>
> > On 4 Nov 2020, at 08:22, Fariba Rahman <fsrahman at bu.edu> wrote:
> >
> > Hi,
> >
> > I am working on a mesh for a class project where I would like to embed a
> rectangular surface ("gate-contact") onto a volume ("AlGaAs Barrier Layer"
> = volume 5) directly below this surface. However the rectangular surface
> ("gate-contact") shares 2 of its edges with the volume below ("AlGaAs
> barrier layer").
> >
> > I am getting an error when I do a 3D mesh, where the top left surface of
> the volume ("AlGaAs barrier layer") adjacent to the rectangular surface
> ("gate-contact") being embedded is not meshing.
> > I get the following error code: "No elements in volume 5"
> > Could you advise on how I can fix this to get all of volume 5 to mesh?
> >
>
> Your model has overlapping surfaces (blue and yellow triangles overlapping
> in your picture).
>
> Christophe
>
>
> > Source code attached.
> > Appreciate your help.
> >
> > Fariba
> >
> > <image.png>
> >
> > <GaAs_FET1v5.geo>_______________________________________________
> > gmsh mailing list
> > gmsh at onelab.info
> > http://onelab.info/mailman/listinfo/gmsh
>
> —
> Prof. Christophe Geuzaine
> University of Liege, Electrical Engineering and Computer Science
> http://people.montefiore.ulg.ac.be/geuzaine
>
>
>
>
>
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