In the context of the CNRS Chair in Physical Hydrodynamics, we would like to recruit a PhD student to work with us at Institut Pprime. The primary goal of the thesis will be to provide theoretical input into the expected behaviour of instabilities induced by anomalous scattering (namely, undulations and the BHL effect) in an open channel flow. It will involve analytical treatments and numerical simulations, as well as data analysis. Ultimately, it is hoped that the understanding gained will be used in the guidance of future experiments, to optimize the visibility of growth and/or saturation effects.
Analysis of instabilities falls into two well-defined parts. Firstly, there is the linear wave analysis, which should provide an exponential growth rate associated with a particular background flow. Various complicating factors can be included, such as friction- and viscosity-induced dissipation, which will tend to reduce the growth rate. The second part involves a determination of the end state of the instability, governed by the growing importance of nonlinearities in the wave dynamics. This determines an overall timescale – the time to reach saturation – which will be critical in the design of experiments.
Bd Marie et Pierre Curie
SP2MI-H2 – Site du Futuroscope
11, Bld Marie et Pierre Curie
CHASSENEUIL DU POITOU
The application must be submitted to: https://emploi.cnrs.fr/
=> https://emploi.cnrs.fr/Offres/Doctorant/UPR3346-NADMAA-083/Default.aspx
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CDD Technicien-ne électronicien-ne - 12 Mois - Catégorie B
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