Hi,

Have you looked at the documentation 
here<http://gmsh.info/doc/texinfo/gmsh.html#MSH-ASCII-file-format> ? It says :
$Periodic
number-of-periodic-entities
dimension slave-entity-tag master-entity-tag
number-of-nodes
slave-node-number master-node-number
…
$EndPeriodic
It looks like your information.

Faithfully Yours,

Guillaume DILASSER
Doctorant SACM / LEAS
CEA - Centre de Saclay - Bât.123 - PC 319c
91191 Gif sur Yvette Cedex - France -

[email protected]<mailto:[email protected]>

De : gmsh [mailto:[email protected]] De la part de Ranga 
Sudarsan
Envoyé : jeudi 27 avril 2017 12:56
À : gmsh mailing list <[email protected]>
Objet : [Gmsh] Help understanding MSH file entries while using "Periodic 
surface with translate "

 Hi there,
    I am meshing a geometry with periodic (translated meshes) boundary 
conditions along one of the directions (X in my case). I am using
periodic surface with translate to setup the translated periodic meshes. I need 
help understanding some entries in the Msh file generated specifically the 
section under "$Periodic" (See attached image, in my case surfaces 1 and 8 are 
periodic). I understand that in my case their are totally 11 periodic entities 
-- 5 points , 5 lines and 1 surface and my trouble is in understanding the 
format of the output corresponding to each of these periodic entities. It will 
be of great help if some one explain to me what is the format for each of these 
entities so that I can write a code to read the msh file and generate relevant 
input files for my finite element solver. I have attached the geo and mesh file.

Thanks again
Ranga Sudarsan
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