Topology-optimized thermal cloak-concentrator

September 24, 2020

Topology-optimized thermal cloak-concentrator realizes excellent cloaking and concentrating simultaneously although it is built of a simple composition. The thermal cloak-concentrator is not so easily effected by fluctuations of thermal conductivity and is designed by incorporating multiple objective functions under various thermal conductivities.

Garuda Fujii of Shinshu University succeeded in simplifying cloaking with the use of topology optimization. In previous studies, metamaterials, which are artificial structures were used to achieve two functions, such as cloaking and concentrating. However, metamaterials make it difficult to manufacture and performance is not easily improved because the performance estimation becomes approximate.

Previous studies investigated the use of general bulk materials, however, it is difficult to achieve multifunctionality and the studies look at just cloaking or concentrating only. By using topology optimization, which is a computational structural design methodology, researchers can use general bulk materials and realize multifunctionality.

The study looked at cloaking the concentrating system in thermal conduction and concentrating heat flux using general materials such as iron, copper, and PDMS. To create STL data of the optimized structures for future experimental demonstrations, they used a structural expression method that can handle the boundaries between different materials clearly and numerically, so called level set-boundary expression. The STL data is publicly available for those who would like to experiment with it.

This study relied on simulations, Associate Professor Fujii hopes to realize this performance in an experiment.
For more information on the study, please read, Cloaking a concentrator in thermal conduction via topology optimization.

Associate Professor Garuda Fujii's Research Laboratory:

This work is supported by JSPS KAKENHI Grant number 17K17778.

Shinshu University

Related Metamaterials Articles from Brightsurf:

Hyperbolic metamaterials exhibit 2T physics
According to Igor Smolyaninov of the University of Maryland, ''One of the more unusual applications of metamaterials was a theoretical proposal to construct a physical system that would exhibit two-time physics behavior on small scales.''

Origami metamaterials show reversible auxeticity combined with deformation recoverability
New research by Northwestern Engineering and Georgia Institute of Technology expands the understanding of origami structures, opening possibilities for mechanical metamaterials to be used in soft robotics and medical devices.

Temporal aiming with temporal metamaterials
Achieving a controllable manipulation of electromagnetic waves is important in many applications.

VR and AR devices at 1/100 the cost and 1/10,000 the thickness in the works
Professor Junsuk Rho of the departments of mechanical engineering and chemical engineering and doctoral student in mechanical engineering Gwanho Yoon at POSTECH with the research team at Korea University have jointly developed moldable nanomaterials and a printing technology using metamaterials, allowing the commercialization of inexpensive and thin VR and AR devices.

Virtualized metamaterials opens door for acoustics application and beyond
Scientists from the Hong Kong University of Science and Technology (HKUST) have realized what they called a virtualized acoustic metamaterial, in digitizing material response to an impulse response stored in a software program.

In acoustic waves, engineers break reciprocity with 'spacetime-varying metamaterials'
Working in an emerging field known to as 'spacetime-varying metamaterials,' University at Buffalo engineers have demonstrated the ability to break reciprocity in acoustic waves.

Induced flaws in metamaterials can produce useful textures and behavior
A new Tel Aviv University study shows how induced defects in metamaterials -- artificial materials the properties of which are different from those in nature -- also produce radically different consistencies and behaviors.

Researchers use metamaterials to create two-part optical security features
Researchers have developed advanced optical security features that use a two-piece metamaterial system to create a difficult-to-replicate optical phenomenon.

Artificial intelligence (AI) designs metamaterials used in the invisibility cloak
The research group of Prof. Junsuk Rho, Sunae So and Jungho Mun of Department of Mechanical Engineering and Department of Chemical Engineering at POSTECH developed a design with a higher degree of freedom which allows to choose materials and to design photonic structures arbitrarily by using Deep Learning.

Scientists take a 'metamaterials' approach to earthquake damage
At the SSA 2019 Annual Meeting, seismologists from around the world will discuss how metamaterial theory might be applied to everything from developing deflective barriers to manipulating the layout of buildings within a city as a way to minimize the impact of damaging surface seismic waves.

Read More: Metamaterials News and Metamaterials Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to