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Multi-scale Modeling ofComposite Riser Systems

Hossam RaghebFluid Structure Interactions Group, University of Southampton

Multi-scale Modeling ofComposite Riser Systems

Hossam RaghebFluid Structure Interactions Group, University of Southampton

Composite Risers

Composite risers as a market niche have captured the industry interest as an innovative solution for deepwater applications where the steel catenary riser solutions reaches its limits,composites properties such as high specific strength, low thermal conductivity, damping properties and the ability to tailor the composite to provide a solution to steel catenaryriser problems, such as high effective tension at the hang-off point which arises the need for high capacity tensioner and also high storage capacity for the floating production vessel.Additionally, the field development might not be feasible due to the high cost needed for the floating production vessel and the riser tensioner.

Subsea Field Development

Fig. 1: Lazy Wave Riser

http://www.petrobras.com.br/fatos-e-dados/dez-principais-feitos-tecnologicos-do-pre-sal.htm

Multi-scale Modeling

Importance Sampling Simulation is becoming thepreferred method to assess structures, which ide-ally requires a fast and accurate structural mod-elling method. Whilst Finite Element Methodscan provide an accurate solution to these problemsthey are slow to run. It is therefore proposed toinvestigate the use of multiscale modelling to inves-tigate the reliability of such structures. This willinvolve the development of: a full-scale model tobe run in conjunction with fluid mechanics simula-tions, a higher resolution model to investigate thefatigue hotspot near the seabed and a more localmodel to simulate the fatigue growth.

Multi-scale approach

Fig. 2: Multiple scales of composite riser

I would like to acknowledge the financial support from the EPSRC.