Importing mesh created in gmsh

General
21

GMSH version is fine. Just uncheck Save parametric coordinates and it should work.

Yes, it is possible. You can modify my geo file as:

SetFactory("Built-in");
//+
Point(1) = {0, 0, 0, 1.0};
//+
Point(2) = {0, 0.2, .2, 1.0};
//+
Point(7) = {0, 0.2, 0, 1.0};
//+
Point(8) = {0, 0, 0.2, 1.0};
//+
Point(10) = {0, 0.1, 0.1, 1.0};
//+
Point(13) = {0, 0.15, 0.1, 1.0};
//+
Point(14) = {0, 0.1, 0.15, 1.0};
//+
Point(15) = {0, 0.1, 0.05, 1.0};
//+
Point(16) = {0, 0.05, 0.1, 1.0};
//+
Circle(1) = {14, 10, 13};
//+
Circle(2) = {13, 10, 15};
//+
Circle(3) = {15, 10, 16};
//+
Circle(4) = {16, 10, 14};
//+
Line(5) = {8, 2};
//+
Line(6) = {2, 7};
//+
Line(7) = {7, 1};
//+
Line(8) = {1, 8};
//+
Curve Loop(1) = {5, 6, 7, 8};
//+
Curve Loop(2) = {4, 1, 2, 3};
//+
Plane Surface(2) = {2};
//+
Plane Surface(3) = {1, 2};

//+
Extrude {1, 0, 0} {Surface{2}; Surface{3}; Layers {10};
}
//+
Physical Surface("top", 110) = {43};
//+
Physical Surface("bottum", 111) = {51};
//+
Physical Surface("left", 112) = {47};
//+
Physical Surface("right", 113) = {55};
//+
Physical Surface("front", 114) = {3};
//+
Physical Surface("back", 115) = {72};
//+
Physical Surface("cylinder_left", 116) = {2};
//+
Physical Surface("cylinder_right", 117) = {30};
//+
Physical Volume("body1", 118) = {1};
//+
Physical Volume("body2", 119) = {2};

But as @dokken said, this a GMSH related question, so I also suggest you practice a GMSH tutorial and Paraview representation because I saw that you are using the Outline Filter, which is not appropriate for visualizing two volumes.

Cheers.

22

managed to resolve the initial issue with this command

gmsh -3 box_cylinder.geo -o box_cylinder.msh

and also managed to create two bodies this way

// Gmsh project created on Mon Jun 03 18:05:16 2024
//+
SetFactory("OpenCASCADE");
Box(1) = {0, 0, 0, 1, 0.2, 0.2};
//+
Cylinder(2) = {-0.1, 0.1, 0.1, 1.5, 0, 0, 0.05, 2*Pi};
//+
BooleanDifference{ Volume{1}; Delete; }{ Volume{2}; Delete; }
//+
Cylinder(2) = {0, 0.1, 0.1, 1, 0, 0, 0.049, 2*Pi};
//+
Physical Surface("left", 19) = {1};
//+
Physical Surface("right", 20) = {7};
//+
Physical Surface("front", 21) = {3};
//+
Physical Surface("back", 22) = {4};
//+
Physical Surface("top", 23) = {5};
//+
Physical Surface("down", 24) = {2};
//+
Physical Volume("box", 25) = {1};
//+
Physical Volume("cylinder", 55) = {2};