Feppon, F.; Allaire, G.; Dapogny, C.; Jolivet, P. Topology optimization of thermal fluid-structure systems using body-fitted meshes and parallel computing. (English) Zbl 1437.74021 J. Comput. Phys. 417, Article ID 109574, 29 p. (2020). Summary: An efficient framework is described for the shape and topology optimization of realistic three-dimensional, weakly-coupled fluid-thermal-mechanical systems. At the theoretical level, the proposed methodology relies on the boundary variation of Hadamard for describing the sensitivity of functions with respect to the domain. From the numerical point of view, three key ingredients are used: (i) a level set based mesh evolution method allowing to describe large deformations of the shape while maintaining an adapted, high-quality mesh of the latter at every stage of the optimization process; (ii) an efficient constrained optimization algorithm which is very well adapted to the infinite-dimensional shape optimization context; (iii) efficient preconditioning techniques for the solution of large finite element systems in a reasonable computational time. The performance of our strategy is illustrated with two examples of coupled physics: respectively fluid-structure interaction and convective heat transfer. Before that, we perform three other test cases, involving a single physics (structural, thermal and aerodynamic design), for comparison purposes and for assessing our various tools: in particular, they prove the ability of the mesh evolution technique to capture very thin bodies or shells in 3D. Cited in 15 Documents MSC: 74P15 Topological methods for optimization problems in solid mechanics 74F10 Fluid-solid interactions (including aero- and hydro-elasticity, porosity, etc.) 74F05 Thermal effects in solid mechanics 76D05 Navier-Stokes equations for incompressible viscous fluids Keywords:shape and topology optimization; fluid-structure interaction; convective heat transfer; aerodynamic design; mesh adaptation; distributed computing Software:FreeFem++; PT-Scotch; COMSOL; PETSc; OpenMDAO; DistMesh; GPUTop PDFBibTeX XMLCite \textit{F. Feppon} et al., J. Comput. Phys. 417, Article ID 109574, 29 p. (2020; Zbl 1437.74021) Full Text: DOI References: [1] Aage, N.; Andreassen, E.; Lazarov, B. S., Topology optimization using petsc: an easy-to-use, fully parallel, open source topology optimization framework, Struct. Multidiscip. Optim., 51, 565-572 (2015) [2] Aage, N.; Andreassen, E.; Lazarov, B. 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