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Explicit level set and density methods for topology optimization with equivalent minimum length scale constraints

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Abstract

The goal of this paper is to introduce local length scale control in an explicit level set method for topology optimization. The level set function is parametrized explicitly by filtering a set of nodal optimization variables. The extended finite element method (XFEM) is used to represent the non-conforming material interface on a fixed mesh of the design domain. In this framework, a minimum length scale is imposed by adopting geometric constraints that have been recently proposed for density-based topology optimization with projections filters. Besides providing local length scale control, the advantages of the modified constraints are twofold. First, the constraints provide a computationally inexpensive solution for the instabilities which often appear in level set XFEM topology optimization. Second, utilizing the same geometric constraints in both the density-based topology optimization and the level set optimization enables to perform a more unbiased comparison between both methods. These different features are illustrated in a number of well-known benchmark problems for topology optimization.

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Funding

The work presented in this paper was performed in the framework of the Any-Shape 4.0 project supported by the Walloon Region (grant number 151066).

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  1. Cenaero, Rue des Frères Wright 29, 6041, Gosselies, Belgium

    Miche Jansen

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  1. Miche Jansen
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Correspondence to Miche Jansen.

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Jansen, M. Explicit level set and density methods for topology optimization with equivalent minimum length scale constraints. Struct Multidisc Optim 59, 1775–1788 (2019). https://doi.org/10.1007/s00158-018-2162-5

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  • DOI: https://doi.org/10.1007/s00158-018-2162-5

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