[Gmsh] Adding a physical surface (on which the load will be applied) to an existing volume.

[Bertrand Thierry]

Hello,

Your Surface is not "in" the volume but on its boundary, your surface is 
counted twice.

Try BooleanFragments, this code should work:

SetFactory("OpenCASCADE");
Box(1) = {0, 0, 0, 100, 10, 10};
Rectangle(7) = {40,0,0,20,10,0};
BooleanFragments{Surface{7}; Delete;}{Volume{1}; Delete;}

Physical Volume("beam") = {1};
Physical Surface("left") = {8};
Physical Surface("right") = {9};
Physical Surface("load") = {7};

Best,


Le 13/02/2020 à 12:35, Vincent Libertiaux a écrit :
> Hi, gmsh community,
>
> I created a simple case (beam fixed at both extremities) with a 
> distributed load on a fraction of its upper surface.  I reproduce the 
> short *.geo file:
>
> SetFactory("OpenCASCADE");
> Box(1) = {0, 0, 0, 100, 10, 10};
> Rectangle(7) = {40,0,0,20,10,0};
> Surface{7} In Volume{1};
> surfaces[] = Boundary{Volume{1};};
> Physical Volume("beam") = {1};
> Physical Surface("left") = {surfaces[0]};
> Physical Surface("right") = {surfaces[1]};
> Physical Surface("load") = {7};
>
> When I try to mesh it, I get the following error:
> Error   : PLC Error:  A segment and a facet intersect at point
> Error   : Invalid boundary mesh (segment-facet intersection) on 
> surface 7, intersection (40,4.7255,6.14662e-11)
>
> I think it comes from the fact that I am trying to impose a surface on 
> another, but I can't find an easy way (rather than defining the 
> geometry with Points, Lines, ... or determining the nodes on which I'd 
> like to apply the loading from the msh file).
>
> Could someone please point me the right direction ?
>
> Thanks,
>
> kind regards,
>
> Vincent
>
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-- 
Bertrand THIERRY
CNRS researcher
Laboratoire Jacques Louis Lions
Office 310, Corridor 15-25
+33 1 44 27 72 01
http://bthierry.pages.math.cnrs.fr/

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