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Multimaterial topology optimization by volume constrained Allen–Cahn system and regularized projected steepest descent method

Authors
Journal
Computer Methods in Applied Mechanics and Engineering
0045-7825
Publisher
Elsevier
Publication Date
Volume
276
Identifiers
DOI: 10.1016/j.cma.2014.04.005
Keywords
  • Gradient Projection
  • Matlab Code
  • Multiphase Allen–Cahn
  • Multiphase Cahn–Hilliard
  • Multiphase Topology Optimization
  • Sobolev Gradient
Disciplines
  • Computer Science
  • Design
  • Mathematics

Abstract

Abstract A new computational algorithm is introduced in the present study to solve multimaterial topology optimization problems. It is based on the penalization of the objective functional by the multiphase volume constrained Ginzburg–Landau energy functional. The update procedure is based on the gradient flow of the objective functional by a fractional step projected steepest descent method. In the first step, the new design is found based on the projected steepest descent method to ensure the reduction in the objective functional, simultaneously satisfying the control constraints. In the second step, regularization step, an H1 regularity of the solution is ensured while keeping the feasibility of solution with respect to the set of control constraints. The presented algorithm could be accounted as a constrained H1 optimization algorithm, which, according to our knowledge, has not been reported to solve such kind of problems yet. The success and efficiency of the presented method are shown through several test problems. Numerical results show that the presented algorithm ends with a near 0–1 topology and its computational cost scales sub-linearly by the number of phases. For the sake of reader convenience and the ease of further extension, the MATLAB implementation of the presented algorithm is included in the appendix.

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