.. _step4_section:


STEP 4 : 2D mesh 
================


Modify and complete the geometrical elements of the mesh to obtain a 2D mesh with rectangular cells.

.. hint::
  Define a *j*-index that is temporarely equal to 1 

In :numref:`figure_2Dmeshes`, the 2D mesh is equivalent to  the 1D one.

.. _figure_2Dmeshes:

.. figure:: ./_static/chapitre6_img/1D&2Dmeshes.jpg
    :scale: 75%
    :align: center

    : Main characteristics of the existing 1D mesh and the 2D mesh to obtain.