The post-doctoral work will consist in examining, by means of atomic-scale simulations, bi-metallic Cu/Ag multilayers in
which different types of semi-coherent interfaces can coexist. The recruited person will have to study the global response of the whole system and identify new elementary mechanisms involved in the formation and extension of mechanical twins during plastic deformation for systems with one or several interfaces. Special attention will be given to the role of the misfit interfacial dislocations mesh. For these systems containing several millions of atoms, classical molecular dynamics calculations will be performed (LAMMPS code) using the embedded-atom method interatomic potentials. Calculations will be mainly performed on local or regional computers; an application for access to national resources (GENCI) will also be made. Depending on the profile of the recruited person, it will be considered to assess the influence of strain rate using accelerated molecular dynamics techniques, and/or Nudged Elastic Band (NEB) calculations.
11, Bd Marie et Pierre Curie
86360 Chasseneuil du Poitou
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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