A continuum based nonlinear finite element for modelling of dynamic response of deep water riser behaviour

Student's name: Dr. Ali Hosseini

First supervisor: Dr. Hamid Bahai

Second Supervisor: Prof Luiz Wrobel

Funded by: Funded by EPSRC (grant EP/C510232/1)

Project details: Flexible risers are slender marine structures that are widely used in offshore production to convey fluids between the well-head and the surface unit. In deep-water applications, because of the low bending stiffness when compared to axial and torsional stiffness, a flexible pipe can suffer large displacements which demand special geometrically nonlinear analysis. On the other hand, deepwater riser fatigue failure due to vortex induced vibration (VIV) is currently considered by the oil industry to be a very significant unresolved problem. When the vortex shedding frequency coincides with a natural frequency of the riser the resulting response can have catastrophic repercussions.

In this project:

  • A finite element formulation is presented for geometrically nonlinear dynamic analysis of flexible riser structures
  • A fluid-structure dynamic interaction scheme using Localized Lagrange Multipliers (LLM) is employed to model coupling between to different regions where for fluid region an existence code will be considered.

Page last updated: Monday 09 July 2012