France – Vendredi 15/05/2020 – energiesdelamer.eu. FEM and IFREMER are looking for a highly motivated candidate eager to develop new experimental approaches and to interact with the other members of the consortium. The candidate will have the opportunity to work in a state-of-the-art facility comprising a deep water wave tank and a wave flume where two new state-of-the-art wave generators will be installed in autumn.
The post-doctoral position is part of the DIMPACT R&D project dedicated to the “Design of FOWT (Floating Offshore Wind Turbine) and IMPACTs of energetic steep and breaking waves”. This project is coordinated by FEM. Within this project, the post-doctoral fellow will contribute to the development and performance of the wave tank experiments which will be conducted at IFREMER in Brest.
The objectives of this experimental task are:
1. to assess experimentally the water impact loads induced by steep and breaking waves on a floating wind turbine,
2. to relate the measured hydrodynamic loads to the incident wave field,
3. to assess the effect of the platform motion on the water impact loads,
4. to compare the measured loads with the results based on semi-analytical water impact models (e.g. Wagner theory or Pressure impulse theory) and with CFD approaches obtained in the other work packages of the DIMPACT project.
For this purpose, an instrumented scaled model of a spar-type FOWT will be designed, built and tested under different wave conditions representative of extreme steep and breaking waves. The motion of the floater will be emulated using a motion generator (hexapod) in order to control and vary the phasing between the motion and the waves. The hydrodynamic load distribution along the spar floater will be assessed using a segmented model and measuring the loads on each segment independently.
The missions of the post-doctoral fellow will be to:
1) design, follow the construction (by a sub-contractor) and test the model,
2) participate to the definition of the experimental conditions to be tested,
3) develop the experimental protocol and methodology,
4) analyze the results,
5) disseminate the results (write publications for research journals, participate to international conference).
Depending on the advancement of the project and remaining budget, complementary experiments with a transparent mock-up are likely to be initiated out in order to track the evolution of the wetted surface during an impact. This work would follow the developments carried out at Ifremer in the last years for the tracking of the wetted surface during water entry and water exit experiments. This method is based on the use of transparent mock-ups and a tangential LED lighting system (see Tassin et al., 2017 and Tassin et al., 2018). The post-doctoral fellow would be in charge of running preliminary experiments in order to show the feasibility of the technique for this particular application and to run the experiments in the wave tank.
Required Qualifications, Skills and Experience
- PhD in mechanical or marine engineering, applied physics, or equivalent. Applications from applicants holding an MSc or MEng in a relevant field with appropriate experience might be considered,
- Strong experience in hydrodynamics, free surface flows and water wave mechanics,
- Expertise in the design of experimental set-ups (including sensor selection and mechanical design with CAD tools) for experiments in hydrodynamics,
- An expertise in nonlinear wave models would be appreciated,
- Programming experience (python, matlab, fortran, ...) for signal processing and analysis,
- Ability to write high level scientific reports and publications.
- Scientific rigor,
un post- Good ability to communicate in English.
Expected starting date: September or October 2020 Duration: 18 months contract
Employer: France Energies Marines - 525 Av de Rochon F-29280 Plouzané
The postdoc will spend about 80% of his time at IFREMER: 1625 Route de Sainte-Anne, F-29280 Plouzané FRANCE
Final date for applications: June 15, 2020.
In case of an expected secondment of the candidate by a member of France Energies Marines, the application should mention the agreement of the present employer.
Tassin, A., Breton, T., Forest, B., Ohana, J., Chalony, S., Le Roux, D., Tancray, A., 2017. Visualization of the contact line during the water exit of flat plates. Experiments in Fluids 58, 104.
Tassin A., Breton T., Jacques N., Etudes expérimentales et théoriques des phénomènes d'entrée et sortie d'eau, In Proc. 16th Journées de l'hydrodynamique (JH2018, November 27-29, Marseille, France), 12 pp.
The post-doctoral fellow will be employed by FEM, but will mainly work at IFREMER where the experiments will take place. Note that the offices of FEM and IFREMER are located on the same campus, at a walking distance. The post-doctoral fellow will be mainly supervised by:
- Alan Tassin, IFREMER, Research Scientist in Hydrodynamics, task leader of the wave tank experiments
- Jean-François Filipot: FEM Scientific and Technical Director, coordinator of the DIMPACT project He/she will also interact with the other industrial and academic members of the consortium (e.g. EDF R&D, ENPC, ENSTA Bretagne).
Points de repère
Lire le descriptif du projet DIMPACT dans la rubrique Thèses d'energiesdelamer.eu