Hydrodynamics Engineer - Monaco Internship

Purpose

• Introduction:

   

  Main types of mooring systems are Single Point Mooring (vessel weatherwaves about a fixed part like a turret) or spread mooring (fixed vessel heading, unit is generally moored by 4 bundles of mooring lines, one per corner). 

  One of the design criteria of mooring systems is fatigue of the mooring components.

  Fatigue (damage on mooring lines) is induced by tension variations in the mooring line over service life and also some contribution arising from in-plane and out-of plane bending stresses on chain links. For turret moored systems, those tension variations on mooring lines also results in loading that serve to design turret structure in fatigue (turret loads)  

  Fatigue is studied versus a long-term description of the environment (scatter diagrams, hindcast data) generally involving a large number of environmental combinations between wind / waves and current. It is often not realistic to run all these combinations in time domain to get their contribution to total damage. Methods are often used to reduce sample size of the environmental combinations from which total damaged will be established.

  A number of these methods are in-use and widely accepted in the industry. Recently, DNV standard DNV-OS-E301 has proposed a method “importance sampling” that deserves to be tested on projects and compared to other concurrent approaches.

   

  Purpose of the internship is to assess suitability of importance sampling method on project and help define best practises regarding mooring fatigue analyses.

Responsibilities

There will be three main steps to cover:

1. Summarize requirements from international standards

2. Define approaches deemed relevant

3. Test importance sampling method on at least two representative projects (one spread mooring and one SPM)

• • Compare outcome with other approaches using representative year(s)
  • Assess if method is deemed appropriate for out-of-plane bending analyses
  • Assess in what measure approach can be extended to turret load analyses (to ensure consistency of approach between mooring lines and turret)

4. If time allows, define what can be done in frequency domain with current tools / software regarding fatigue analyses

5. Assess practicality to deploy such methods on projects.

Your Role

• • Get a good understanding of the methods used .
  • Perform numerical analyses to find best modelling techniques. Interpret results.
  • Present conclusions to Hydrodynamics department.

What it will bring to you:

• • Exposure to engineering methods used in mooring design
  • Use of industry-recognized software (Ariane, Orcaflex)
  • Solid theoretical and practical background on mooring whichever field of applications (offshore, renewables …).

Education

• • Engineering schools , 2nd or 3rd year
  • Prior exposure to offshore industry, mooring is a plus
  • Programming in Python (script to handle large data, to cluster data) is required