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On Barrier and Modified Barrier Multigrid Methods for Three-Dimensional Topology Optimization

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    0532969 - ÚTIA 2021 RIV US eng J - Journal Article
    Brune, A. - Kočvara, Michal
    On Barrier and Modified Barrier Multigrid Methods for Three-Dimensional Topology Optimization.
    SIAM Journal on Scientific Computing. Roč. 42, č. 1 (2020), A28-A53. ISSN 1064-8275
    Institutional support: RVO:67985556
    Keywords : topology optimization * multigrid methods * interior point methods * preconditioners for iterative methods * augmented Lagrangian methods
    Subject RIV: BA - General Mathematics
    OBOR OECD: Pure mathematics
    Impact factor: 1.976, year: 2019
    http://library.utia.cas.cz/separaty/2020/MTR/kocvara-0532969.pdf https://epubs.siam.org/doi/abs/10.1137/19M1254490

    One of the challenges encountered in optimization of mechanical structures, in particular in what is known as topology optimization, is the size of the problems, which can easily involve millions of variables. A basic example is the minimum compliance formulation of the variable thickness sheet (VTS) problem, which is equivalent to a convex problem. We propose to solve the VTS problem by the penalty-barrier multiplier (PBM) method, introduced by R. Polyak and later studied by Ben-Tal and Zibulevsky and others. The most computationally expensive part of the algorithm is the solution of linear systems arising from the Newton method used to minimize a generalized augmented Lagrangian. We use a special structure of the Hessian of this Lagrangian to reduce the size of the linear system and to convert it to a form suitable for a standard multigrid method. This converted system is solved approximately by a multigrid
    Permanent Link: http://hdl.handle.net/11104/0311788
     
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