Full 3D non-linear multi-physics model for High Field polyhelix Magnets
Résumé
The Laboratoire National des Champs Magnetiques Intenses (LNCMI) is a French
large scale facility enabling researchers to perform experiments in the highest possible
magnetic field. DC magnetic fields up to 36 T are provided at the Grenoble
site and pulsed fields up to 80 T at Toulouse. The technology used for DC magnets
relies on the so-called polyhelix inserts for the most constrained parts of these magnets.
In a context of highest field worldwide competition, this technology is pushed
to its limits both in terms of temperature and mecanical stresses. The design of
such magnets then requires reliable multi-physics models. As we cannot rely on
any symmetries in the geometry to simplify our model, we have to tackle a full 3D
model with complex geometries and non-linear phenomena due to the dependence
of physical properties of the materials with respect to the temperature field.
In this work, we present the first complete study from preliminary axisymmetric
optimization design to full scale 3D model of our latest 36 tesla magnet including
thermal, mechanical and electromagnetic modeling. The automatic generation of
the 3D magnet geometry and mesh is performed with Salome software. The 3D
simulations are carried out with our in-house developments based on the Feel++
library. The capability of seamless parallel computing of this library allows us to
take full advantages of HPC facilities in order to carry out detailed analysis of our
magnets at a reasonable computational cost.
Advanced numerical and analysis methods are used to study the sensitivity of the
method with respect to design parameters and material properties and to provide
insight of our models. This work describes briefly the application of the Reduced
Basis Method in this context.
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