Séminaire Equipe OMN, 21 Juin 2018
Le Jeudi 21 mai 2018, Reda EL Bechari,doctorant de l’équipe OMN, effectuera un séminaire sur le thème :
Date : Jeudi 21 juin 2018 à 13h30
Lieu : Salle 2S53 à Lilliad
The increasing constraints on the design of electromagnetic devices require numerical tools that are able to finely model the electromagnetic fields in the studied domain. Finite Element Method (FEM) is the most used tool to satisfy such a requirement. However, it may turn out that this tool is very expensive in computational time due to nonlinear behavior, 3D geometries, and time dependency. Thus, its usage for optimization, i.e. iterative process, should be made with caution since only a limited number of evaluations of the simulation tool are possible. Thus, the use of some specific algorithms may not be possible in a limited time, e.g. genetic algorithms, that require many evaluations of the FEM code. On the other hand, gradient-based algorithms cannot be used to their full potential due to the re-meshing error that may appear when computing the gradient using finite difference.
There exist two approaches. A non-intrusive approach that considers the FEM simulation as a black-box and constructs cheap meta-models to reduce the computational burden while refining only in promising regions. And a second approach aims to exploit the derivative of quantities of interest computed from the finite element code by using the adjoint method to be able to use gradient-based algorithms.
11ème école d’été internationnale EMR, 13 juin 2018
Thèse : Reda BAKRI, 28 Juin 2018
