6 month Engineer position Stochastic modelling and numerical simulation of coupled oceanic flow, small-scale dynamics, wave-current interaction

Inria; Rennes; Hybrid; EUR 27.000 - 33.000; Teilzeit

Benefits dieser Stelle

Remboursement partiel des frais de运输

Télétravail possible (90 jours/an) et/

Paiement partiel des coûts d'assurance

Zusammenfassung

Inria Rennes recrute un ingénieur pour six mois afin de modéliser et simuler numériquement des écoulements océaniques couplés et leur interaction vague-courant. Le poste est au sein de l’équipe Odyssey, en collaboration avec des partenaires académiques et industriels.

Solide formation en mathématiques appliquées et en dynamique des fluides, avec connaissances en paramétrisation stochastique et en Fortran, Python et Pytorch.

Qualifikationen

• Solide formation en mathématiques appliquées et en dynamique des fluides.
• Connaissances en paramétrisation stochastique.
• Bonne maîtrise de Fortran, Python et Pytorch.

Aufgaben

• Évaluer numériquement des modèles stochastiques pour les écoulements océaniques.
• Implémenter et tester des systèmes de simulation dans des situations idéalisées.

Kenntnisse

Fortran

Python

Pytorch

Stochastic parameterization

Fluid dynamics

Jobbeschreibung

6 month Engineer position Stochastic modelling and numerical simulation of coupled oceanic flow, small-scale dynamics, wave-current interaction

The Inria Centre at Rennes University is one of Inria's nine centres and has more than thirty research teams. The Inria Centre is a major and recognized player in the field of digital sciences. It is at the heart of a rich R&D and innovation ecosystem: highly innovative PMEs, large industrial groups, competitiveness clusters, research and higher education players, laboratories of excellence, technological research institute, etc.

The Odyssey team is offering a 6 month engineer position on ocean modelling within the ERC Stuod (Stochastic transport in ocean dynamics). Odyssey (for Ocean DYnamicS obSErvation analYsis) is a recently created team involving researchers from Inria (Rennes, France), Ifremer (Brest) and IMT Atlantique (Brest).

Inria is one of the leading research institute in Computer Sciences in France, and Odyssey is also affiliated to the mathematics research institute of the Rennes University (IRMAR).

The team expertise encompasses mathematical (stochastic) and numerical modelling of ocean flows, observational and physical oceanography, data assimilation and machine learning.

Gathering this large panel of skills, the team aims at improving our understanding, reconstruction and forecasting of ocean dynamics, and more specifically to bridge model-driven and observation-driven paradigms to develop and learn novel representations of the coupled ocean-atmosphere dynamics ocean models.

For accurate climatic predictions, it is essential to have plausible forecasts of the future ocean state. Ideally, high-resolution ocean simulations would be used for this purpose. However, due to their associated computational costs, this approach is currently infeasible, and we must rely only on large-scale ocean representations.

To address this challenge and the urgent need to generate various likely scenarios, there has been a growing interest in geophysical sciences and climate studies in developing flow models that incorporate noise to account for modelling uncertainties or errors.

The introduction of noise into ocean dynamics models must be done on a theoretically rigorous ground. Ad-hoc choices for model noise can fundamentally disrupt the corresponding fluid dynamics models, leading to unrealistic properties. Rigorously justified methodologies for deriving stochastic dynamics models have been recently introduced in the Odyssey team within the ERC STUODand a longstanding collaboration with Imperial College and Ifremer.

The theoretical framework on which we rely, referred to as "modelling under location uncertainty", decomposes the flow in terms of a resolved smooth component and a rapidly oscillating random component.The stochastic dynamics is then defined from a stochastic representation of the Reynolds transport theorem.From this modelling principle, stochastic equivalents of the classical geophysical flow models can be defined.

The present engineer position aims to assess numerically coupled stochastic variational models proposed recently.

Originally proposed for the Euler equations by A. Debussche and E. Mémin for the incompressible Euler equation, the formalism has been very recently extended to oceanic flow models. The objective will consist in implementing such systems in idealized situations.

The engineer position will take place in the Odyssey group in Rennes, and will collaborate with Arnaud Debussche and Etienne Mémin.

The candidate should have a solid background in applied mathematics and in fluid dynamics dynamics. He/She should have knowledge on stochastic parameterization. She/he must have a good knowledge of Fortran, Python, Pytorch.

Avantages

• Partial reimbursement of public transport costs
• Possibility of teleworking (90 days per year) and flexible organization of working hours
• Partial payment of insurance costs

Starting from €2,695 gross per month, based on your experience

The candidate will work within an international collaboration. This will include in particular regular meetings and the writing of short regular reports on the advance oh his/her his work. She/he must be fluent in english.