How to assign block id for embedded line in GMSH

[rksin8]

Dear moose users,

I have a mesh that contains an embedded line. I want to assign properties based on block ID but when I open this mesh in ParaView, I see only one block ID for the surface. How can I create a block ID for the line as well?

Input for geo file:

Mesh.Algorithm = 1;
Mesh.Optimize = 1;
lc=50;
lc2=10;
Point(0)={0,0,0,lc};
Point(1)={500,0,0,lc};
Point(2)={500,500,0,lc};
Point(3)={0,500,0,lc};
Point(4)={100,250,0,lc2};
Point(5)={400,250,0,lc2};
Point(6)={175,250,0,lc2};
Point(7)={325,250,0,lc2};
Line (1) ={0,1};
Line (2) ={1,2};
Line (3) ={2,3};
Line (4) ={3,0};
Line (5) ={4,6};
Line (6) ={6,7};
Line (7) ={7,5};
Line Loop(1) ={1,2,3,4};
Ruled Surface(1) = {1};
Line {5} In Surface {1};
Line {6} In Surface {1};
Line {7} In Surface {1};
Point {6} In Surface {1};
Point {7} In Surface {1};
Physical Surface(1) = {1};
Physical Line("fracture") = {6, 5, 7};
Physical Line("left") = {4};
Physical Line("right") = {2};
Physical Line("top") = {3};
Physical Line("bottom") = {1};
Physical Point("injection_well") = {6};
Physical Point("production_well") = {7};

Regards,
Ranjeet

[GiudGiud]

@lindsayad if you know.
Otherwise, Ranjeet, if you get the answer from a gmsh forum, please post the answer here to help others.

Thanks

[rksin8]

Thank you for your reply. now we have a solution.

[lindsayad]

@rksin8 If you want to create a lower dimensional block, you need to make sure that the Physical name contains the string lower_dimensional_block. So if you want "fracture" to be a lower dimensional block, then you would do this:

Physical Line("fracture_lower_dimensional_block") = {6, 5, 7};

[rksin8]

It worked! Thank you so much.

[hugary1995]

Awesome! I was just about to ask the same question.