F modeling
==============

Characteristics of modeling
-----------------------------------

3D discretization of the beam with element HEXA8. Beam-wall contact is modeled by DIS_CHOC in explicit dynamics (with consistent mass matrix and lumped mass matrix).

The initial conditions and the boundary conditions are imposed through groups of nodes:


.. csv-table::

    "PAROI ", "(embedding the lower nodes of the contact element)"
    "PLANSYMX ", "(symmetry conditions according to :math:`x`)"
    "PLANSYMY ", "(symmetry conditions according to :math:`y`)"
    "NOBARRE ", "(initial movements and speeds)."



Characteristics of the mesh
----------------------------

Number of knots: 88

Number of meshes and types: 21 HEXA8