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Journal Articles SIAM Journal on Scientific Computing Year : 2023

Inversion of Eddy-Current Signals Using a Level-Set Method and Block Krylov Solvers

Abstract

The application motivating this work is related to the identification of deposits inside nuclear power plant steam generators using eddy-current probes. We consider a realistic experimental process that relies on the scan of a domain by sweeping along a tube axis a probe made out of coils, playing the role of the sources/receivers. Solving the inverse shape problem associated with these measurements using a least squares method requires solutions to the eddy-current and the adjoint problems for a large number of right-hand sides at each gradient-descent iteration. Additional cost in the forward solver comes from the use of a potential formulation of the problem that has the advantage of being independent from the topology of the conductive media (that may vary during iterations). We use a level-set approach to avoid remeshing and handle unknown topologies. The crucial ingredient in our algorithm is an optimized way of handling high numbers of right-hand sides for iterative solvers of large-scale problems. We first benchmark various block Krylov methods, block GMRES and block BGCRODR, to test their effectiveness compared to their standard counterpart, i.e., GMRES and GCRODR. Then, we propose for BGCRODR a new implementation for recycling information from previously generated Krylov bases that scales better than traditional approaches. This part is independent from the practical inverse problem at hand. The efficiency of the overall inversion procedure is finally demonstrated on realistic synthetic 3D examples.
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Dates and versions

hal-03043491 , version 1 (07-12-2020)
hal-03043491 , version 2 (03-08-2021)

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Lorenzo Audibert, Hugo Girardon, Houssem Haddar, Pierre Jolivet. Inversion of Eddy-Current Signals Using a Level-Set Method and Block Krylov Solvers. SIAM Journal on Scientific Computing, 2023, 45 (3), pp.B366-B389. ⟨10.1137/20M1382064⟩. ⟨hal-03043491v2⟩
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