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H/F - PhD position in Lagrangian fluid mechanics - Project Wiliam - LOMC

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

Date Limite Candidature : samedi 13 août 2022

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General information

Reference : UMR6294-GREPIN-001
Workplace : LE HAVRE
Date of publication : Saturday, July 23, 2022
Scientific Responsible name : Grégory PINON
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 17 October 2022
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly

Description of the thesis topic

In the context of the development of renewable energies, wind power has become a mature technology after several decades of development. Today, the share of wind power in the energy mix is constantly increasing and offshore wind turbines are increasingly being implemented because the wind resource is more important and more stable [PPE 2020]. At the same time, other technologies such as tidal turbines are being developed. The latter still suffers from reliability and performance problems. However, several farms of 3 or 4 prototypes are being tested around the world [MeyGen 2021, EnFait 2021].
Wind and tidal power are two similar technologies: they seek to extract kinetic energy from the fluid in which they are immersed (air or water) using a rotating machine. The energy source of these rotors being intermittent by definition, their production depends directly on the operating conditions. In addition to the intermittence, i.e. variation in amplitude, the upstream flow can vary on other characteristics: turbulence rate, anisotropy, characteristic lengths, boundary layer... These properties can lead to variations in turbine performance and mechanical loads [Slama 2021]. The cost of energy and the life of the machines are then affected [Walker 2021].
In order to reduce installation and maintenance costs, offshore wind and tidal turbines are grouped in farms that can have up to 50 machines. In this configuration, turbine-to-turbine wake interaction phenomena appear, again impacting performance and loads [Gaurier 2020].
A detailed understanding of the physical phenomena involved in the flows around wind and tidal turbines, and more specifically the aerodynamics around the blades and in the wake, is therefore essential to optimize them, reduce costs and extend their lifetime.
The objective of this thesis is to better characterize the performance, loads and impact on the wake of offshore wind and tidal turbines as a function of operating conditions and to deepen the knowledge on the machine-to-machine interactions in the farms. This work will be performed the Lagrangian Vortex Based code DOROTHY.

DOROTHY aims at solving unsteady flows and is particularly well suited to the configuration of open flows [Pinon 2012]. The code is based on a Lagrangian approach of the flow and is able to treat lifting surfaces using differents methods such as (Boundary integral method, lifting line) which make the code well uited for treating turines such as wind and/or tidal turines. Moreover, the recent implementation of a ambiant turbulence model developped by Choma Bex et al. [Choma Bex 2020] enables us to treat wake effects and wakes interactions when several turbines are considered.
The thesis work will consist of 2 main tasks:
• Study of the performances, loads and wakes of wind and tidal turbines in several configurations: amplitude and direction of the upstream flow, turbulence rate, anisotropy, characteristic lengths, boundary layer... The goal is to generate a database of numerical calculation results with different numbers of turbines and under different conditions. This database will then be post-processed and analyzed.
• Comparison of two advanced numerical methods: simulations performed with DODOTHY will be compared to those performed with the YALES2 code (code developed at the CORIA laboratory, https://www.coria-cfd.fr/index.php/YALES2) [Moureau 2011]. Although both codes are dedicated to unsteady turbulent flows, they use fundamentally different numerical methods. The codes will therefore be compared on some aspects such as the quality of the results, the restitution time or the parallel performances. The idea is to identify the advantages/disadvantages of each approach on a given range of spatial/temporal scales and/or a given configuration (single turbine, multi-turbine, whole farm).
[Benard2018] Benard, P., Viré, A., Moureau, V., Lartigue, G., Beaudet, L., Deglaire, P., Bricteux, L. (2018). Large-Eddy Simulation of wind turbines wakes including geometrical effects. Computers and Fluids, 173, 133–139.
[EnFait2021] Enabling Future Arrays in Tidal https://www.enfait.eu/ last view 27 sept. 2021
[Gaurier2020] B. Gaurier, C. Carlier, G. Germain, G. Pinon, and E. Rivoalen. Three tidal turbines in interaction : An experimental study of turbulence intensity effects on wakes and turbine performance. Renewable Energy, 148 :1150 – 1164, 2020
[Gremmo2021] Simone Gremmo, Félix Houtin-Mongrolle, Pierre Bénard, Bastien Duboc, Ghislain Lartigue, et al.. Large-Eddy Simulation of Deformable Wind Turbines. WESC2021, May 2021, Hannover, Germany
[Meygen2021] Tidal Stream Project MeyGen https://simecatlantis.com/projects/meygen/ last view 27 sept. 2021
[Moureau2011] Moureau, V., Domingo, P., Vervisch, L. (2011). Une algorithmique optimisée pour le supercalcul appliqué à la mécanique des fluides numérique. Comptes Rendus - Mecanique, 339 (2–3), 141–148.
[Pinon2012] G. Pinon, P. Mycek, G. Germain, and E. Rivoalen. Numerical simulation of the wake of marine current turbines with a particle method. Renewable Energy, 46(0) :111 – 126, 2012
[PPE2020] Décret n° 2020-456 du 21 avril 2020 relatif à la programmation pluriannuelle de l'énergie https://www.legifrance.gouv.fr/jorf/id/JORFTEXT000041814432
[Slama2021] M. Slama, G. Pinon, C. El Hadi, M. Togneri, B. Gaurier, G. Germain, J.-V Facq, J. Nuno, P. Mansilla, E. Nicolas, J. Marcille, and A. Pacheco. Turbine design dependency to turbulence : an experimental study of three scaled tidal turbines. Ocean Engineering, 234 :109035, 2021
[Walker2021] S. Walker and P.R. Thies. A review of component and system reliability in tidal turbine deployments. Renewable and Sustainable Energy Reviews, 151, 2021

Work Context

Laboratory LOMC www.lomc.fr
Doctorate School PSIME https://ed-psime.normandie-univ.fr/
Links with the CORIA team: https://www.coria-cfd.fr/index.php/YALES2

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