All elements which are part of the geometry item are deleted. In this way, it is easy to make a mesh with holes, tunneling systems in ground, etc. Remaining nodes in the geometry, are moved onto the edge of the geometry if the corresponding control_mesh_delete_geometry_movenodes record with the same index is set to -yes; (otherwise, the remaining nodes are left inside the geometry). For these remaining nodes, automatically a node_boundary record will be generated.
For a geometry_point, elements inside the tolerance distance of the point will be deleted. For a geometry_circle, elements in the total inner area of the circle radius plus its tolerance will be deleted. Likewise for other geometries.
If you combine this record with a control_timestep record, then the element will be slowly deleted, starting from a complete element at the start of the timestep up to no element at the end of the timestep. This is accomplished by reducing the nodal forces of the elements slowly to zero; at the end of the timestep, the element is deleted completely. This might be usefull for a better convergence behaviour of the iterative process.
See also control_mesh_delete_geometry_movenodes, control_mesh_delete_geometry_element and control_mesh_delete_geometry_elementgroup.