Two Level Correction Algorithms for Model Problems
Résumé
In this report, we experiment a variant of the two-level ideal algorithm for parametric shape optimization that was proposed in [5]. In the linear case, the method, referred to as the Z' method, employs a permutation operator to rearrange the eigenstructure in such a way that the new high-frequency modes are associated with large eigenvalues. As a result, the classical steepest-descent iteration can be viewed as a Jacobi-type smoother, and standard multilevel stragegies be applied. An alternate method is also tested based on odd-even decoupling (L' method). For a linear model problem, both new methods are found efficient and superior to the original formulation, but the Z' method is more robust. Similar numerical results are obtained for a nonlinear model problem by considering the eigensystem of the Jacobian matrix.
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