EPSRC CDT in Metamaterials: Control of flow-induced near-field noise through the use of metasurfaces Ref: 2564

College of Engineering, Mathematics and Physical Sciences

University of Exeter

The studentship is part of the UK’s Centre of Doctoral Training in Metamaterials (XM2) based in the Departments of Physics and Engineering on the Streatham Campus in Exeter. Its aim is to undertake world-leading research, while training scientists and engineers with the relevant research skills and knowledge, and professional attributes for industry and academia.

This studentship is funded via the EPSRC Industrial Cooperative Awards in Science & Technology (CASE) scheme, via a grant awarded to Thales. The successful applicant will be registered on the XM2 programme of study and follow that assessment and training programme. He or she will normally be required to undertake regular reporting and visits to the sponsor. The student will not have the flexibility to change topic after the initial 6 month project. For more details about the Industrial CASE scheme, see https://www.epsrc.ac.uk/skills/students/coll/icase

Please see our website for more details about the centre and programme www.exeter.ac.uk/metamaterials.

Joint supervisors: Prof Alastair Hibbins, Prof Roy Sambles

Industrial supervisors: Dr Phil Cotterill, Dr Alan Curtis

Sponsor requirements limit this studentship to UK-nationals only.

Statement of Research

Turbulent flow over a surface may limit the detection performance of sonar systems. This project will investigate the effectiveness of patterned surfaces in the reduction of flow noise in structures exposed to turbulent flow, bringing together the disciplines of hydrodynamics, hydroacoustics, and structural dynamics to determine the noise response of a sensor beneath the surface.

Flow-induced noise is a limiting factor affecting the performance of sonar systems, including both hull-mounted and towed array sonars. In a typical system, the impact of hydro acoustic noise generated by turbulence – induced pressure fluctuations at the surface is mitigated by the introduction of a stand-off layer between the flow and the sensor, through which non-propagating modes are attenuated. The aim here is to reduce array volume by tackling the fundamental problem of the generation of the turbulent pressure fluctuations and their propagation into the array, allowing size reductions whilst maintaining or improving on current performance. We will achieve this goal by investigating how metasurfaces may effect changes to the flow noise at a sensor through several mechanisms: (i) drag reduction through patterning of the surface, which may result in a reduction in turbulent pressure variations at the surface; (ii) patterning resulting in modification of the wavenumbers generated in the turbulent boundary layer; (iii) use of resonant metasurfaces to control the propagation of structural waves, raising the possibility that flow noise can be steered away from the sensing elements or coupled into more highly attenuated modes. To date, metamaterials have not been fully exploited in the underwater world, and this project will provide valuable information to the scientific and engineering communities.

About XM2

Metamaterials are fabricated microstructures having properties beyond those found in nature. They are emerging as an important new class of materials with applications in many technology areas, from energy harvesting, through perfect imaging, to the much-hyped ‘cloaking’. Having recruited over 50 new PhD researchers in its first three years, the EPSRC Centre for Doctoral Training (XM2) hosted by the University of Exeter (www.exeter.ac.uk/metamaterials) will admit its fourth cohort of 14-18 PhD students in September 2017.

Exeter has a well-established and strong track record of relevant research, spanning a unique mix of interests. We will run projects in the following fields (see our list of themes for full details)

•Optical, Infra-red and THz Photonics and Plasmonics
•Microwave Metamaterials
•Magnonics, Spintronics and Magnetic Metamaterials
•Acoustic and Fluid-dynamical Metamaterials
•Wave Theory and Spatial Transformations
•Graphene and other 2D Materials, and related Devices
•Nanomaterials and Nanocomposites
•Biological and Bio-inspired Metamaterials
•Quantum Metamaterials

The first year of the studentship includes an assessed, stand alone project, and a substantial programme of training. Students will choose from a wide range of taught modules, and participate in academic and personal development skills-based workshops, together with creativity events and conference-style meetings. The cohort will also be expected to disseminate their results to the international community via high-impact publications and international conferences. They will spend time working with our academic and industrial partners. Full details of the programme are available here, or email us metamaterials@exeter.ac.uk for a copy of our prospectus.

The University of Exeter is a top 10 UK university, in the top 1% of universities globally, and a member of the elite Russell Group of institutions. The University has committed itself to a substantial expansion in its science base and within Physics and Engineering, over £10m has been spent on infrastructure since 2008 and around 30 new academic staff have been appointed across the Centre's themes.

Funding information

Funding applies to:
EU applicants (including UK)
Funding notes:

Tuition fee, and stipend (approx.£16,500) for UK/EU students. We are no longer able to consider applications from international candidates (non EU).

Contacts and how to apply

Administrative contact and how to apply:

For further information and details of how to apply please see here.

Application deadline:

30 June 2017