February 27, 2020
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Full-time, Fixed Term until 31st December 2021
Closing Date: 13 March 2020
Under the supervision of Professor Alban Pothérat, (http://users.complexity-coventry.org/~potherat/), Executive Director of the Centre for Fluid and Complex Systems Research, Coventry University, UK.
Applications are invited for the position of Research Associate in Experimental Fluid Mechanics sponsored by the Leverhulme Trust (http://www.leverhulme.ac.uk). The project concerns convection in magnetic fields in the so called “Tangent Cylinder” region of the Earth’s core. Much of the mystery surrounding the Earth’s dynamics (its magnetic field, plate tectonics) lies in the nature of the convective patterns within the Earth’s liquid core, and in particular in the region called the “Tangent Cylinder”. What are the possible convective states under the combined influence of the Earth’s rotation and magnetic field, and how erratic are they? This project is part of a theoretical and experimental research program funded by the Trust that aims at answering these questions. The purpose of the experimental part of the programme is to explore the nonlinear convective states that may exist within a laboratory based ‘Tangent Cylinder’ when suitable perturbations are applied to the flow. These states will then be evaluated to see which are mostly likely to underpin the Earth’s core convection.
The project involves operating a novel experiment previously developed in our group to visualise rotating magnetoconvective patterns. Its principle is to use a weakly conductive, but transparent electrolyte, subjected to the very high magnetic fields available at the Grenoble High Magnetic Field Laboratory (France). Part of the experimental work will consist of upgrading the technique first developed in this experiment that makes it possible to visualise flow patterns in electrically conductive fluids by means of bespoke Particle Image Velocimetry (PIV) methods.
The successful candidate should hold a PhD or equivalent in Fluid Mechanics, Geophysics, or Physics with a proven track record of producing scientific output at the highest level, as evidenced by high-quality journal publications. The Research Associate will work within the vibrant environment of the Fluid Dynamics group, part of the Fluid and Complex Systems Research Centre, at Coventry University. The group conducts both fundamental and applied research in the fields of stability, magnetohydrodynamics, turbulence and geophysical fluid dynamics as well as other areas of fluid mechanics. In the REF2014, 84% of the group’s output, as part of the mathematics submission, was deemed ‘internationally excellent’ or ‘world-leading’. The project involves extended stays at the Grenoble High Magnetic Field Laboratory, France where the experiment will be operated.
The post is fixed term until 31st December 2021. To apply please also include your CV with a publication list. For further information please contact Professor Alban Pothérat (Coventry University, email@example.com, +44(0)2477 65 88 65).
Closing Date: 13 March 2020
September 30, 2019
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A member of the Helmholtz Association of German Research Centers, the HZDR employs about 1,200 people. The Center’s focus is on interdisciplinary research in the areas energy, health and matter.
The Institute of Fluid Dynamics is conducting basic and applied research in the fields of thermo-fluid dynamics and magnetohydrodynamics in order to improve the sustainability, the energy efficiency and the safety of industrial processes.
As part of the Institute, the Department of Magnetohydrodynamics, invites applications as Research Associate/Postdoc (m/f/d).
The position will be available from 1st January 2020. The employment contract is limited to three years.
The appearance of thermal superstructures in turbulent convection within very low Prandtl number fluids will be investigated experimentally in a large aspect ratio domain. The experiments will be conducted using the liquid metal Gallium-Indium-Tin (GaInSn) that has a Prandtl number of 𝑃𝑟 ≈ 0.03. Combined temperature and velocity measurements will provide detailed information about turbulent, convective superstructures and their dynamics. A novel Ultrasound-Doppler-Array technique will be used to measure for the first time two dimensional velocity vector fields of the superstructures in a turbulent liquid metal convection.
The project includes the following tasks:
- preparation and operation of a Rayleigh-Bénard convection cell for liquid metal
- measurements of global transport laws for heat and momentum
- simultaneous measurements of flow velocity using ultrasound Doppler velocimetry and temperature distribution using thermocouples
- investigation of the three-dimensional flow structure and dynamics of turbulent superstructures
- comparison of the results to direct numerical simulations (carried out by project partners)
- completed doctorate in physics, mechanical engineering or comparable qualification
- a strong technical and physical understanding is mandatory
- background knowledge on thermal convection would be advantageous
- high scientific professional networking as well as scientific excellence
- internationality and diversity
- interesting and diverse tasks, flexible working hours, salary based on the collective agreement TVöD-Bund
- equality of opportunity and family-friendly structures, corporate health management
- attractive work and research terms in a highly motivated team
Kindly submit your completed application (including cover letter, CV, diplomas/transcripts, etc.) only via our Online-application-system.
Online application English / German
August 21, 2019
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||2nd August 2019
||£32,243 to £40,802 per annum
||2nd September 2019
A Research Fellow position in theoretical fluid mechanics is offered at Coventry University (UK). The project concerns convection under a magnetic field in the so called “tangent cylinder” region of the Earth’s core. Much of the mystery surrounding the Earth’s dynamics (its magnetic field, plate tectonics) lies in the nature of the convective patterns within the Earth’s liquid core, and in particular in the region called the “Tangent Cylinder”. What are the possible convective states under the combined influence of the Earth’s rotation and magnetic field, and how erratic are they? This study is part of a theoretical and experimental research program funded by the prestigious Leverhulme Trust (http://www.leverhulme.ac.uk), that aims at answering these questions. The purpose of this thesis is to theoretically predict the possible nonlinear convective states for the first time. We will then evaluate which of these states are mostly likely to underpin the Earth’s core convection.
The Research Fellow will conduct the theoretical and numerical analysis of the problem under the joint supervision of Prof. Alban Pothérat (http://users.complexity-coventry.org/~potherat/index.html) and Dr Chris Pringle. The study will seek the possible structure of convection by means of advanced stability theory and branch tracking method, to unveil the possible states. In the frame of the research programme, the work is purely theoretical/numerical and will be conducted in collaboration with an experimental study that will seek to reproduce and visualise these non-linear states in an experimental model of the Earth Core.
Successful candidates are expected to hold a PhD in fluid mechanics or a related discipline and to have demonstrated excellent abilities in mathematics and programming.
The successful candidate will be part the vibrant team of internationally recognised academics and PhD students forming the fluid dynamics group within the Applied Mathematics Research Centre, whose work has been ranked at 83% world-class at the UK’ latest Research Excellence Framework in 2014. This unit is part of the Fluid and Complex Systems Research Centre, and specialises in theoretical and experimental fluid mechanics. It is especially renowned for its work on magnetohydrodynamics (MHD), turbulence, stability and geophysical flows. The group closely collaborates with partner groups in world-leading institutions in Australia, China, France, Germany and the UK.
Informal enquiries are welcome: please forward a CV and academic records to Prof. Alban Pothérat (firstname.lastname@example.org).
Refs.:: Laboratory model for the convective patterns in the Tangent Cylinder of the Earth core (Aujogue, Pothérat, Sreenivasan & Debray, 2018, Journal of Fluid Mechanics)