Discretization
==============


Degrees of freedom
------------------


.. csv-table::

    "**Modeling**", "**Degrees of Freedom**
    **(at each vertex node)**"
    "AXIS ", "DX: corresponds to the radial displacement
    DY: corresponds to the longitudinal displacement"
    "D_ PLAN ", "DX: move next X
    DY: next move Y"
    "C_ PLAN ", "DX: move next X
    DY: next move Y"



Support mesh for stiffness matrices
------------------------

The support cells of the finite elements can be triangles or quadrangles. The elements are iso-parametric.


.. csv-table::

    "**Models**", "**Mesh**", "**Interpolation**"
    "AXIS
    D_ PLAN
    C_ PLAN "," TRIA3
    QUAD4
    TRIA6
    QUAD8
    QUAD9 ", "Linear
    Bi-linear
    Quadratic
    Serendip
    Bi-Quadratic"



Cargo support mesh
------------------------------


.. csv-table::

    "**Models**", "**Mesh**", "**Interpolation**"
    "AXIS
    D_ PLAN "," SEG2 ", "Linear
    or"
    "C_ PLAN "," SEG3 ", "Quadratic"