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Reports (Research Report) Year : 2007

Two Level Correction Algorithms for Model Problems


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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Dates and versions

inria-00161891 , version 1 (12-07-2007)
inria-00161891 , version 2 (16-07-2007)


  • HAL Id : inria-00161891 , version 2


Jichao Zhao, Jean-Antoine Desideri, Badr Abou El Majd. Two Level Correction Algorithms for Model Problems. [Research Report] RR-6246, INRIA. 2007, pp.28. ⟨inria-00161891v2⟩
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