[Gmsh] boundary help

[Manan Patel]

hi all!
i am not using gmsh solver. my problem is that of heat transfer in a human
tissue. i need boundary faces so that i can add the effects of convection.
does gmsh provide the boundary faces? if yes, then please specify the link
where the details are given, or explain what is the format of specifying the
boundaries.
if gmsh does not provide these boundaries, then please list any alternate
meshing software for the required purpose.
thank you!
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