Research Assistant/Associate in New optimisation algorithms for turbulent flows
“New generation of optimisation algorithms for turbulent flows” The central aim of the EPRSC-funded project is to develop the new generation of optimisation algorithms for turbulent flows. When scale-resolving simulations (like DNS or LES) are employed to optimise time-average quantities (like lift or drag), existing algorithms that are based on adjoint sensitivity fail; this is due to the chaotic nature of turbulence, a phenomenon...
Job listing information
- Reference ENG01914
- Date posted 3 November 2021
- Closing date 2 December 2021
“New generation of optimisation algorithms for turbulent flows”
The central aim of the EPRSC-funded project is to develop the new generation of optimisation algorithms for turbulent flows. When scale-resolving simulations (like DNS or LES) are employed to optimise time-average quantities (like lift or drag), existing algorithms that are based on adjoint sensitivity fail; this is due to the chaotic nature of turbulence, a phenomenon popularly known as the `butterfly effect'. Recently a new approach, called least squares shadowing, was proposed to overcome his problem. The resulting algorithm however does not scale well for turbulent flows.
In this project, we plan to devise and develop new shadowing algorithms that achieve superior computational efficiency by exploiting known structural properties that are unique to turbulence. Specifically, we will leverage tools that provide compact representation of turbulent fluctuations, such as Resolvent Analysis and Proper Orthogonal Decomposition, to obtain efficient shadowing algorithms that are tailored to turbulent flows. We will demonstrate the performance of the newly developed methods to flow reconstruction using data assimilation in a boundary layer flow. Collaborators in this work are researchers from University of Southampton, MIT and University of Reading.
Duties and responsibilities
- Perform DNS (or LES) of wall-founded flows and extract reduced order models
- Couple the shadowing approach with these models
- Assess performance when applied to wall-bounded turbulent flows.
- Investigate the tangent equation and analyse the properties of the unstable directions (covariant Lyapunov vectors)
- Draft journal papers.
- Attend relevant workshops and present at conferences
Those appointed at Research Associate level
Hold a PhD (or equivalent) in Engineering or a closely related discipline.
Those appointed at Research Assistant level
A first / masters degree (or equivalent) in Engineering or a closely related discipline.
*Candidates who have not yet been officially awarded their PhD will be appointed as Research Assistant level.
*This post is full time, fixed term for 42 months (or until 31 Mar 2025 whichever is earliest)
Should you require any further details on the role please contact: Prof. G. Papadakis
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