36 months

PhD proposal 2025 : Experimental fluid mechanics and acoustics – Oscillating flows

[TheChamp-Sharing]
Applicants are invited for a 3-year Ph.D. studentship in Pprime laboratory at the University of Poitiers. The successful candidate will have the opportunity to work within a research team of an ANR-funded project, named ImClean, willing to improve the performance of thermoacoustic refrigerators. These offer a green alternative to conventional refrigeration systems as they use environmentally friendly gases. Besides their simple construction, they include less mechanical moving parts and hence require less maintenance. However, their performance is impacted by several non-linear phenomena such as streaming, natural convection, transition to turbulence. Both understanding and quantifying the effects of these non-linear phenomena on performance are vital for designing more performant refrigerators. This PhD Project focuses on quantifying the effects of both the transition to turbulence of oscillating flow and flow discontinuities on acoustic energy losses.
Islam Ramadan - Contacter
Pprime Campus, Bat B17

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12 months

POST-DOC (M/F) - Control by Machine Learning of bluff body wakes

At the CNRS-Laboratory PPRIME, based at the Futuroscope, this post-doctorate position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. Three-dimensional bluff-body wakes generate pressure drag and side forces and thus contribute significantly to the fuel consumption and pollutant emission of road vehicles. Despite this crucial impact and the numerous attempts to reduce harmful environmental effect of bluff body wakes by flow control it is still unclear what is the most efficient control strategy! In this context, the ANR project COWAVE addresses two fundamental aspects of wake control: - First, what kind of actuators are most efficient? While most closed-loop control strategies use viscous entrainment effects to actuate the shear layers in the wake, the exploitation of pressure forces produced by mobile deflectors could be an interesting alternative to be tested. - Second, for the implementation of closed-loop control, we want to test if control strategies obtained by machine learning techniques allow to obtain better efficiency and robustness than the more classical model-based approaches? The proposed Post-Doc position is part of the French ANR COWAVE program between the laboratories PRISME in Orleans, Pprime in Poitiers, LHEEA in Nantes and the PSA automotive industry. This Post-Doc position concerns the Pprime contribution to the COWAVE project which aims the experimental exploration of closed-loop wake control strategies with mobile flaps in a water tunnel facility. APPLY Follow link / Application Deadline : 12 March 2021 https://bit.ly/3qDG6Ml