Large scale three-dimensional topology optimisation of heat sinks cooled by natural convection

Alexandersen, Joe; Sigmund, Ole; Aage, Niels

doi:10.1016/j.ijheatmasstransfer.2016.05.013

Cited by 245 publications

(168 citation statements)

References 52 publications

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“…We remark that in particular for small filter radii, using a continuation strategy with many stages produces better results than using a continuation approach with few stages. This is in line with the results by, for example, Alexandersen et al (2016), who remark that using a continuation scheme typically produces better results than starting with the end values. However, without imposing severe design restrictions, one cannot provide any convergence guarantees for continuation schemes in general (Stolpe and Svanberg 2001).…”

Section: Discussionsupporting

confidence: 91%

On minimum length scale control in density based topology optimization

Hägg

Wadbro

2018

Struct Multidisc Optim

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This is the published version of a paper published in Structural and multidisciplinary optimization (Print). Citation for the original published paper (version of record):Hägg, L., Wadbro, E. (2018) On minimum length scale control in density based topology optimization AbstractThe archetypical topology optimization problem concerns designing the layout of material within a given region of space so that some performance measure is extremized. To improve manufacturability and reduce manufacturing costs, restrictions on the possible layouts may be imposed. Among such restrictions, constraining the minimum length scales of different regions of the design has a significant place. Within the density filter based topology optimization framework the most commonly used definition is that a region has a minimum length scale not less than D if any point within that region lies within a sphere with diameter D > 0 that is completely contained in the region. In this paper, we propose a variant of this minimum length scale definition for subsets of a convex (possibly bounded) domain. We show that sets with positive minimum length scale are characterized as being morphologically open. As a corollary, we find that sets where both the interior and the exterior have positive minimum length scales are characterized as being simultaneously morphologically open and (essentially) morphologically closed. For binary designs in the discretized setting, the latter translates to that the opening of the design should equal the closing of the design. To demonstrate the capability of the developed theory, we devise a method that heuristically promotes designs that are binary and have positive minimum length scales (possibly measured in different norms) on both phases for minimum compliance problems. The obtained designs are almost binary and possess minimum length scales on both phases.

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Section: Discussionsupporting

confidence: 91%

On minimum length scale control in density based topology optimization

Hägg

Wadbro

2018

Struct Multidisc Optim

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“…Most work focuses on forced convection, where the fluid flow is induced by a fan, pump or pressure-gradient. In contrast, the authors have previously presented a density-based topology optimisation approach for both two-dimensional [30] and three-dimensional [31] natural convection problems. A levelset method for steady-state and transient natural convection problems was presented by Coffin and Maute [32].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, a density-based method based on a simplified convection model was presented for plane extruded structures [33] under natural convection. Although, well-performing structures are obtained using this approach, this cannot be guaranteed in general due to the simplified modelling [31,34]. This paper builds on the large-scale parallel topology optimisation framework previously presented in [31].…”

Section: Introductionmentioning

confidence: 99%

“…Although, well-performing structures are obtained using this approach, this cannot be guaranteed in general due to the simplified modelling [31,34]. This paper builds on the large-scale parallel topology optimisation framework previously presented in [31]. Initial results applying the framework to the design of heat sinks for LED lamps was presented in [35].…”

Section: Introductionmentioning

confidence: 99%

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Design of passive coolers for light-emitting diode lamps using topology optimisation

Alexandersen

Sigmund

Meyer

et al. 2018

International Journal of Heat and Mass Transfer

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Topology optimised designs for passive cooling of light-emitting diode (LED) lamps are investigated through extensive numerical parameter studies. The designs are optimised for either horizontal or vertical orientations and are compared to a lattice-fin design. The different orientations result in significant differences in topologies. The optimisation favors placing material at outer boundaries of the design domain, leaving a hollow core that allows the buoyancy forces to accelerate the air to higher speeds. Investigations show that increasing design symmetry yields performance with less sensitivity to orientation with a minor loss in mean performance. The topology-optimised designs of heat sinks for natural convection yield a 26% lower package temperature using around 12% less material compared to the lattice-fin design, while maintaining low sensitivity to orientation. Furthermore, they exhibit several defining features and provide insight and general guidelines for the design of passive coolers for LED lamps.

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“…passive transport (Andreasen et al, 2009), reacting flows (Okkels and Bruus, 2007), buoyancy problems (Alexandersen et al, 2014), active transport e.g. heat (Yoon, 2010a;Marck et al, 2013;Alexandersen et al, 2016). Models for including the fluid structure interaction have been developed as demonstrated in Yoon (2010b) and Kreissl et al (2010).…”

Section: Primary Inflow Outflowmentioning

confidence: 99%

Topology optimization of inertia driven dosing units

Andreasen

2016

Struct Multidisc Optim

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This paper presents a methodology for optimizing inertia driven dosing units, sometimes referred to as eductors, for use in small scale flow applications. The unit is assumed to operate at low to moderate Reynolds numbers and under steady state conditions. By applying topology optimization to the Brinkman penalized Navier-Stokes equation the design of the dosing units can be optimized with respect to dosing capability without initial design assumptions. The influence of flow resistance and speed is investigated to assess design performance under varying operating conditions.

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Large scale three-dimensional topology optimisation of heat sinks cooled by natural convection

Cited by 245 publications

References 52 publications

On minimum length scale control in density based topology optimization

On minimum length scale control in density based topology optimization

Design of passive coolers for light-emitting diode lamps using topology optimisation

Topology optimization of inertia driven dosing units

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