Stage – Sujet : Biofouling et Ombilicaux (H/F/X)

Proposition de stage soutenu par le Laboratoire d’Excellence ORACLEMaster internship supported by Laboratory of Excellence ORACLE à Nantes Université project OMDYHEAT

Context

This proposal is the continuation of the collaboration between LTeN and ISOMER that was initiated during the PhD of Ziad Maksassi ) and devoted to the assessment of the thermal properties of biofouling within the federation of research IUML. A first modelling was able to compute the temperature of the effect of marine growth by considering deterministic properties. Marine growth being a biological model, uncertainties of the thickness with time and the uncertainty on the thermal property knowing the thickness should be analyzed. The objective is to open now a new collaboration by considering all the uncertainties.

Keywords

Monitoring; Biofouling; marine growth

Master internship description

The main objective of this project is to quantify the impact of biofouling by mussels on the temperature of dynamic electrical cables in floating wind turbines by considering the uncertainties. More specifically, it involves calculating the probability of exceeding the critical temperature of 90°C, taking into account different ambient temperature conditions and the gradual growth of mussel colonies.

Responsibilities

• Model the thickness of marine growth with time by considering 2 sites (Atlantic and Mediterranean) from the model of ISOMER/UCD/ENS Paris Saclay.
• Model the uncertainty of the thermal properties of marine growth with time from the thickness.
• Couple the existing model of cross section of cables using Comsol Multiphysics with OpenTurns for uncertainty propagation.
• Perform a reliability analysis that takes into account uncertainties related to model parameters.
• Analyze the results to identify critical operating conditions and propose recommendations to improve the reliability of dynamic cables.

Thermal data relating to mussel colonization and the thermal model of an underwater cable already available in Comsol will be integrated into this study.

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Objectives

This internship aims at addressing the key research issue in O)sore Wind: understand and reduce the uncertainty and risk inherent in energy production in the marine environment (Assess the service life of offshore structures in marine environment).

Master Fellowship

By assessing the thermal impacts of biofouling, we hope to propose a contribution to improve the design and maintenance of floating wind turbine power cables, thereby increasing their reliability and energy efficiency in a hostile marine environment. This is also an input for analysing the added value of an accurate monitoring of marine growth on dynamic power cables.

Information to be completed

Supervisor: Bertrand GARNIERResearch Unit: LTeNInstitution of affiliation: NUEmail: Co-supervisor: Franck SCHOEFSResearch Unit: ISOMERInstitution of affiliation: NUEmail: Starting date: between March 1st and April 1st 2026.Duration: 4-6 months