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• W2097102907 abstract "Conventional shape optimization based on the finite element method uses Lagrangian representation in which the finite element mesh moves according to shape change, while modern topology optimization uses Eulerian representation. In this paper, an approach to shape optimization using Eulerian representation such that the mesh distortion problem in the conventional approach can be resolved is proposed. A continuum geometric model is defined on the fixed grid of finite elements. An active set of finite elements that defines the discrete domain is determined using a procedure similar to topology optimization, in which each element has a unique shape density. The shape design parameter that is defined on the geometric model is transformed into the corresponding shape density variation of the boundary elements. Using this transformation, it has been shown that the shape design problem can be treated as a parameter design problem, which is a much easier method than the former. A detailed derivation of how the shape design velocity field can be converted into the shape density variation is presented along with sensitivity calculation. Very efficient sensitivity coefficients are calculated by integrating only those elements that belong to the structural boundary. The accuracy of the sensitivity information is compared with that derived by the finite difference method with excellent agreement. Two design optimization problems are presented to show the feasibility of the proposed design approach." @default.
• W2097102907 created "2016-06-24" @default.
• W2097102907 creator A5008014896 @default.
• W2097102907 creator A5036830353 @default.
• W2097102907 date "2005-08-01" @default.
• W2097102907 modified "2023-10-18" @default.
• W2097102907 title "Eulerian shape design sensitivity analysis and optimization with a fixed grid" @default.
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• W2097102907 doi "https://doi.org/10.1016/j.cma.2004.12.019" @default.
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