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Modélisation multi-physique en génie électrique. Application au couplage magnéto-thermo-mécanique

Abstract : The modeling of multi-phycics problems in electrical engineering is presented, with an application to the numerical computation of vibrations within the end windings of large turbo-generators. This study is divided into four parts: the impositions of current density, the computation of local forces, the transfer of data between disconnected meshes, and the computation of multi-physics problems using weak coupling, Firstly, the representation of current density within numerical models is presented. The process is decomposed into two stages: the construction of the initial current density, and the determination of a divergence-free field. The representation of complex geometries makes the use of analytical methods impossible. A method based on an electrokinetical problem is used and a fully geometrical method are tested. The geometrical method produces results closer to the real current density than the electrokinetical problem. Methods to compute forces are numerous, and this study focuses on the virtual work principle and the Laplace force considering the recommendations of the literature. Laplace force is highly accurate but is applicable only if the permeability is uniform. The virtual work principle is finally preferred as it appears as the most general way to compute local forces. Mesh-to-mesh data transfer methods are developed to compute multi-physics models using multiples meshes adapted to the subproblems and multiple computational software. The interpolation method, a locally conservative projection, and an orthogonal projection are compared. Interpolation method is said to be fast but highly diffusive, and the orthogonal projections are highly accurate. The locally conservative method produces results similar to the orthogonal projection but avoid the assembly of linear systems. The numerical computation of multi-physical problems using multiple meshes and projections is then presented. However for a given class of problems, there is not an unique coupling scheme possible. Analytical tests are used to determine, for different class of problems, the most accurate scheme. Finally, numerical computations applied to the structure of end-windings is presented.
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Submitted on : Wednesday, December 18, 2013 - 10:27:08 AM
Last modification on : Tuesday, January 19, 2021 - 3:12:34 AM
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  • HAL Id : tel-00920289, version 1

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Antoine Journeaux. Modélisation multi-physique en génie électrique. Application au couplage magnéto-thermo-mécanique. Autre [cond-mat.other]. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112209⟩. ⟨tel-00920289⟩

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