Principle of the test
================

The structure is 2D. It is a square composed of 2 zones :math:`\mathit{CARR1}` and :math:`\mathit{CARR2}`.


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This structure is meshed 2 times :math:`\mathit{MA1}` and :math:`\mathit{MA2}`. The meshes are different.

On :math:`\mathit{MA1}`, we create a field by ELNO hydration elements (:math:`\mathit{CH1}`).

On :math:`\mathit{CARR1}`: :math:`\mathit{CH1}` is equal to :math:`0.8`

On :math:`\mathit{CARR2}`: :math:`\mathit{CH1}` is equal to :math:`0.2`

We want to project :math:`\mathit{CH1}` onto :math:`\mathit{MA2}` to get :math:`\mathit{CH2}` so that :math:`\mathit{CARR1}` and :math:`\mathit{CARR2}` keep the same values.

Node :math:`\mathit{N36}` is on the border of mesh :math:`\mathit{MA2}`.

It belongs to the :math:`\mathit{M9}` mesh of :math:`\mathit{CARR1}`

It belongs to the :math:`\mathit{M10}` mesh of :math:`\mathit{CARR2}`