13. Summary of results

The five models carried out have the same division in the direction of temperature propagation; they differ only by their type of mesh.

The five models give results where some values exceed the tolerance set initially (1%). The maximum difference is 9.9%. It appears for the lowest reference value located in the middle of the wall and at the beginning of the transition.

A finer mesh combined with finer temporal discretization should improve the quality of the results.

In addition, the reference solution involves an error function whose precision is unknown.

The results are considered to be acceptable taking into account the points mentioned above.

This test made it possible to test hexahedral and tetrahedral meshes in transient non-linear thermics as well as the following main thermal controls:

• DEFI_MATERIAU associated with the keyword THER_NL, making it possible to define the characteristics of a material whose characteristics vary according to temperature (conductivity and enthalpy),

• THER_NON_LINE command allowing the resolution of a non-linear thermal problem, stationary or not.