[Gmsh] Unexpected behavior with legacy file format

[Christophe Geuzaine]

Dear Jozsef,

Can you try the latest development snapshot? I think this should be fixed.

Christophe

> On 25 Jun 2019, at 09:23, Kópházi József <j.kophazi at imperial.ac.uk> wrote:
> 
> Dear Gmsh users,
> 
> I created a simple extruded model in gmsh and the mesh was written into a legacy format file (2.2). Then I'm trying to load the very same mesh into the same version of gmsh and it keeps complaining about missing periodic features.
> 
> Typical error messages:
> 
> Info    : Could not find periodic slave entity 5 of dimension 0
> Info    : Could not find periodic master entity 2 of dimension 0
> ... several more like these ...
> Info    : Could not find periodic slave entity 30 of dimension 1
> Info    : Could not find periodic master entity 6 of dimension 1
> Info    : Could not find copy of vertex 6 in face 26, looking in entity 17 of dimension 2
> Error   : Could not find copy of vertex 6 in 26 nor in 17
> 
> The problem occurs with gmsh 4.2.2 and 4.3.0 as well. If I use file format 4.1 or revert to an older version of gmsh (3.0.1) the problem disappears.
> 
> I never tried or wanted to produce any periodic information in the mesh file. Is there any way to disable emission of periodic information?
> 
> Thank you,
> 
> J
> 
> 
> Input file:
> 
> // Set the defaults
> If ( !Exists( divisions ) )
>     divisions = 5;
> EndIf
> If( !Exists( base_structured ) )
>     base_structured=0;
> EndIf
> If( !Exists( steel_hex ) )
>     steel_hex=1;
> EndIf
> If( !Exists( lead_hex ) )
>     lead_hex=1;
> EndIf
> 
> // Points
> internal_point = newp;    Point( internal_point)     = {  0.00 ,   0.00,   0.00, 1.0};
> middle_point = newp;    Point( middle_point)     = {  2.00     , 0.00,   0.00, 1.0};
> external_point = newp;    Point( external_point)     = { 12.06 ,   0.00,   0.00, 1.0};
> 
> 
> // Lines
> steel_line = newl;        Line( steel_line) = {internal_point, middle_point};
> lead_line = newl;        Line( lead_line) = {middle_point, external_point};
> 
> // Extrude the whole thing to form the disk we need
> If( base_structured == 1 )
> 
>     If( steel_hex == 1 )
>         sout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>         {    Line { steel_line };
>             Layers{ 5*divisions };
>             Recombine;    };
>     Else
>         sout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>         {    Line { steel_line };
>             Layers{ 5*divisions };    };
>     EndIf
> 
>     If( lead_hex == 1 )
>         lout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>         {    Line { lead_line };
>             Layers{ 5*divisions };
>             Recombine;    };
>     Else
>         lout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>         {    Line { lead_line };
>             Layers{ 5*divisions };    };
>     EndIf
> 
> Else
> 
>     sout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>     {    Line { steel_line };    };
>     If( steel_hex == 1 )
>         Recombine Surface{sout[1]};
>     EndIf
> 
>     lout[] = Extrude{ { 0.0, 0.0, 1.0 }, { 0.0, 0.0, 0.0 }, Pi/2 }
>     {    Line { lead_line };    };
>     If( lead_hex == 1 )
>         Recombine Surface{lout[1]};
>     EndIf
> 
> EndIf
> 
> Coherence;
> 
> // Pick up new entities
> //Printf( "%f %f %f %f", sout[0], sout[1], sout[2], sout[3] );
> steel_otherside_line = sout[0];
> steel_surface = sout[1];
> 
> //Printf( "%f %f %f %f", lout[0], lout[1], lout[2], lout[3] );
> lead_otherside_line = lout[0];
> lead_surface = lout[1];
> 
> middle_line = sout[2];
> external_line = lout[2];
> 
> // Transfinite settings
> Transfinite Line { steel_line}                = 1*divisions +1 Using Progression 1.;
> Transfinite Line { lead_line}                = 5*divisions +1 Using Progression 1.;
> 
> Transfinite Line { steel_otherside_line}    = 1*divisions +1 Using Progression 1.;
> Transfinite Line { lead_otherside_line}        = 5*divisions +1 Using Progression 1.;
> 
> If( !(base_structured == 1) )
>     Transfinite Line { middle_line}        = 1.5*1*divisions +1 Using Progression 1.;
>     Transfinite Line { external_line}    = 1.5*5*divisions +1 Using Progression 1.;
> EndIf
> 
> 
> // Extrude everything vertically
> vout = Extrude{ 0.0, 0.0, 2.0 }
>             {    Surface{ steel_surface, lead_surface };
>                 Layers{ divisions };
>                 Recombine; };
> 
> // Pick up new surfaces and volumes
> steel_top_surface = vout[0];
> steel_volume = vout[1];
> steel_left_surface = vout[2];
> middle_surface = vout[3];
> steel_back_surface = vout[4];
> 
> lead_top_surface = vout[5];
> lead_volume = vout[6];
> lead_left_surface = vout[7];
> external_surface = vout[8];
> lead_back_surface = vout[9];
> 
> 
> // Physical domains
> Physical Surface("ExternalSurface") = {external_surface};
> Physical Surface("MiddleSurface") = {middle_surface};
> 
> Physical Surface("SteelLeftSurface") = {steel_left_surface};
> Physical Surface("LeadLeftSurface") = {lead_left_surface};
> Physical Surface("SteelOtherSurface") = {steel_back_surface};
> Physical Surface("LeadOtherSurface") = {lead_back_surface};
> 
> Physical Surface("SteelBottomSurface") = {steel_surface};
> Physical Surface("SteelTopSurface") = {steel_top_surface};
> 
> Physical Surface("LeadlBottomSurface") = {lead_surface};
> Physical Surface("LeadTopSurface") = {lead_top_surface};
> 
> Physical Volume("SteelVolume") = {steel_volume};
> Physical Volume("LeadVolume") = {lead_volume};
> 
> 
> 
> // Save it in old format
> Mesh.MshFileVersion = 2.2;
> 
> 
> 
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— 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine