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Portail > Offres > Offre UMR5318-NICODI-001 - Postdoc position (H/F): Numerical methods for Large Eddy Simulation of two-phase flows

Postdoc position (H/F): Numerical methods for Large Eddy Simulation of two-phase flows

This offer is available in the following languages:
Français - Anglais

Date Limite Candidature : vendredi 2 septembre 2022

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General information

Reference : UMR5318-NICODI-001
Workplace : TOULOUSE
Date of publication : Friday, July 1, 2022
Type of Contract : FTC Scientist
Contract Period : 18 months
Expected date of employment : 3 October 2022
Proportion of work : Full time
Remuneration : Gross salary: between 2660€ and 3700€, depending on experience
Desired level of education : 5-year university degree
Experience required : Indifferent

Missions

CECI and CERFACS develop numerical tools to address High Performance Computing and Large Eddy Simulations (LES). In particular, the AVBP numerical solver allows to address LES predictions of spray transport and evaporation, combustion, pollutant emissions. AVBP is a massively parallel solver, unstructured, compressible, explicit, allowing both Finite Volume (Lax Wendroff) and Finite Elements methods (Taylor-Galerkin [1]).
A recent research activity [2] has allowed the prediction of primary atomization through the use of a so-called diffuse interface multi-fluid method [3], relying on an approximated HLLC Riemann solver.
Another on-going research activity has recently allowed the development of high-order numerical schemes in a Finite Element framework [4].

This postdoc position intends to improve the numerical methods involved in the multi-fluid method. A demonstration of coupling between the same HLLC Riemann solver [5] and a Finite difference scheme has been performed for plasma applications [6]. A similar idea is followed here, where a coupling between the node-centered HLLC and the usual cell-vertex context of AVBP is targeted. A coupling with the newly developed high-order schemes can then be considered.

Expected start: Fall 2022

References :

[1] Colin O, Rudgyard M. Development of high-order Taylor—Galerkin schemes for LES. J Comput Phys 2000, 162(2):338–71.
[2] Carmona, J. Modélisation des phénomènes diphasiques dans des injecteurs aéronautiques de type Airblast, PhD Thesis, INP Toulouse. 2021
[3] Saurel, R., Boivin, P. & Le Métayer, O. A general formulation for cavitating, boiling and evaporating flow, Computers & Fluids 2016 128, 53–64.
[4] Martin, B., Méthodes numériques et conditions limites pour la simulation aux grandes échelles du couplage entre plusieurs composants d'une turbomachine. PhD Thesis, INP Toulouse. 2021
[5] Cheng, L., Barleon, N., Vermorel, O., Cuenot, B. and Bourdon, A. (2022) AVIP: a low temperature plasma code. arXiv e-print 2201.01291
(https://arxiv.org/abs/2201.01291)
[6] Barléon, N. Modélisation et simulations détaillées de décharges nanosecondes répétitives pulsées pour la combustion assistée par plasma. PhD Thesis, INP Toulouse. 2022

Activities

-Development of numerical methods, validation, and implementation in our solver AVBP (Fortran90, eventually Python)
-interactions with several people involved in the project (intern, PhD students, other CERFACS teams, external advisors, ...)
- Communicating results (redaction of articles in international journals, communication in international conferences)

Skills

The candidate should hold a PhD degree in applied mathematics, mechanical engineering, fluid mechanics or any other related field. Expertise in numerical methods for unsteady compressible flows is required. Experience with finite elements, unstructured grids, parallelization, eventually GPU is highly welcomed.
The candidate is expected to be self-motivated, willing to learn the specific numerical methods of AVBP, to conduct research and communicate results in conferences and international journals.

Work Context

The postdoc fellow will be hosted by CERFACS Climate Team (within UMR CECI), involved in research for aviation and environment. The candidate will evolve in a large team of PhD students involved on the development of AVBP, including on-going research activity around high-order schemes.
Interactions with the Parallel Algorithms Team of CERFACS may be expected. Finally, the candidate will also interact with an external consultant, involved in numerical methods for AVBP.

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