.. _V3.04.002:

**v3.04.002** SSLV002 — Definition of local references for massive elements by an orientation field
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**Summary:**

The objective of this test is to validate the functionality of defining the orientations of the local references of massive elements via a given orientation field under the MASSIF/CHAM_ORIE keyword of the AFFE_CARA_ELEM operator.

The intended application is the use of orientation fields generated automatically from the mesh topology by the Local Frames Generator utility based on MEDCoupling and available in Salome (from version 9.11).

Local Frames Generator calculates local references :math:`(L,T,N)` from the topology of a mesh of a slender structure (typically wind turbine blades or submarine thrusters with leading and trailing edges), or obtained from a generator (typically a spring).

The vector :math:`L` makes it possible to follow the direction of the slender or generator. Vector :math:`T` is the vector tangent to the outer skin of the mesh. The vector :math:`N` makes it possible to constitute the direct orthonormal coordinate system. The utility then post-processes the information to return it in the form of a 7-component field corresponding to the aster data structure of type SD_CARA_ELEM. CARMASSI. It is such a field that is expected as the input of the CHAM_ORIE keyword from AFFE_CARA_ELEM/MASSIF.

In this test, we work on a pipe sector consisting of an orthotropic material (therefore defined in relation to local references), embedded at the level of its lower face. A force distributed over its upper face is applied to it. In this configuration, the local references in fact correspond to the cylindrical reference frame.

The test is composed of two models:


* in modeling A, which is used as a reference, the cylindrical references are obtained "by hand" by calculating the Euler angles mesh by mesh, as was done and validated in the hsnv134b test from the validation repository.


* in B modeling, we use the local reference field generated automatically from the mesh topology of the pipe sector with the Local Frames Generator tool.


.. toctree::
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    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Probl_me_de_r_f_rence

    1
    Solution_de_r_f_rence
    Mod_lisation_A
    Mod_lisation_B