Make physical surface with conditions
SetFactory("OpenCASCADE");
Cylinder(2) = {0,0,0, 0,125,0, 50};
Mesh.MeshSizeMax = 4;
Physical Surface("boundaryU") = {2};
Physical Surface("boundaryB") = {3};
I have a cylinder, how to make sub physical surface from surface{2} by radius, like when 0<r<1, physical surface("1"),