This record makes material to slide over the geometry specified by geometry_entity geometry_entity_index. Velocities normal to that direction are not allowed.
This option comes handy when it is a priori known at which nodes
sliding will occur, which is typically the case in an Eulerian calculation
(i.e. if nodes remain in place with node_locate index -no ),
or if deformations are small.
Otherwise, contact conditions should be used
(see contact_geometry etc.).
Optionally slide_friction can be specified.