Three-dimensional fluid topology optimization for heat transfer
File(s)
Published version
Author(s)
Pietropaoli, Marco
Montomoli, F
Gaymann, Audrey
Type
Journal Article
Abstract
In this work, an in house topology optimization (TO) solver is developed to optimize a conjugate heat transfer problem: realizing more complex and efficient coolant systems by minimizing pressure losses and maximizing the heat transfer. The TO method consists in an idealized sedimentation process in which a design variable, in this case impermeability, is iteratively updated across the domain. The optimal solution is the solidified region uniquely defined by the final distribution of impermeability. Due to the geometrical complexity of the optimal solutions obtained, this design method is not always suitable for classic manufacturing methods (molding, stamping....) On the contrary, it can be thought as an approach to better and fully exploit the flexibility offered by additive manufacturing (AM), still often used on old and less efficient design techniques. In the present article, the proposed method is developed using a Lagrangian optimization approach to minimize stagnation pressure dissipation while maximizing heat transfer between fluid and solid region. An impermeability dependent thermal conductivity is included and a smoother operator is adopted to bound thermal diffusivity gradients across solid and fluid. Simulations are performed on a straight squared duct domain. The variability of the results is shown on the basis of different weights of the objective functions. The solver builds automatically three-dimensional structures enhancing the heat transfer level between the walls and the flow through the generation of pairs of counter rotating vortices. This is consistent to solution proposed in literature like v-shaped ribs, even if the geometry generated is more complex and more efficient. It is possible to define the desired level of heat transfer and losses and obtain the closest optimal solution. It is the first time that a conjugate heat transfer optimization problem, with these constraints, has been tackled with this approach for three-dimensional geometries.
Date Issued
2019-03-15
Date Acceptance
2018-09-18
Citation
Structural and Multidisciplinary Optimization: computer-aided optimal design of stressed solids and multidisciplinary systems, 2019, 59 (3), pp.801-812
ISSN
1615-147X
Publisher
Springer
Start Page
801
End Page
812
Journal / Book Title
Structural and Multidisciplinary Optimization: computer-aided optimal design of stressed solids and multidisciplinary systems
Volume
59
Issue
3
Copyright Statement
© 2018 The Author(s). This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Sponsor
NUOVO Pignone Tecnologie s.r.l
Identifier
https://link.springer.com/article/10.1007%2Fs00158-018-2102-4
Grant Number
440088573
Subjects
Science & Technology
Technology
Computer Science, Interdisciplinary Applications
Engineering, Multidisciplinary
Mechanics
Computer Science
Engineering
Conjugate heat transfer
Topology optimization
Gas turbine coolant system
Additive manufacturing
DESIGN
01 Mathematical Sciences
09 Engineering
Design Practice & Management
Publication Status
Published
Date Publish Online
2018-10-25