Job description

This project will fundamentally investigate how offshore cables – specifically, mooring lines and umbilicals for offshore renewable energy devices, can be better understood in terms of lifetime behaviour in harsh environmental conditions and related biological growth over time. The biofouling and marine growth of cables can significantly alter the hydrodynamic effect of these cables, and being a fundamentally nonlinear structure in operation, this problem is extremely challenging, poorly understood, requires extensive interdisciplinary knowledge and has far reaching consequences and impacts. In particular, the project will consist of 4 definite scientific work packages:

WP1: A comprehensive integration of biofouling and marine growth types (species), their clustering and growth patterns to obtain a realistic spatio-temporal evolution of such growth on mooring lines and umbilicals.

WP2: Development of a detailed numerical evidence base on the interaction between waves stochasticity, cable nonlinearity (geometric and material) in operational and extreme circumstances and the spatiotemporal biological effects. Software and differential equation driven models will be used. This will involve extensive hydrodynamic analyses.

WP3: Understanding sensitivities of various biological growth patterns and species to performance measures of cables over lifetime. Performance measures will include both durability and structural failure aspects. The concept of structural reliability will come here by establishing the design points and UMR CNRS 6183 parameter importance measures. Effects of climate variability in terms of
biological growths will also be discussed.

WP4: Application of the developed insights to real/realistic scenarios on data obtained from various campaigns of testing in sea. This will make the insights developed from the PhD close to the industrial needs and to be exploited in future.

How to apply

Contacts :

Dr. Vikram Pakrashi, Assistant Professor, School of Mechanical and Materials
Engineering, University College Dublin, Ireland : vikram.pakrashi@ucd.ie

Pr Franck Schoefs, Institut Universitaire Mer et Littoral, Université de Nantes :
franck.schoefs@univ-nantes.fr