Details of Grant 

EPSRC Reference:	GR/R35803/01
Title:	Mutiple Stable/unstable equilibria and dynamics of a marine riser in the wake of an upstream riser
Principal Investigator:	Huang, Dr S
Other Investigators:	Barltrop, Professor N
Researcher Co-Investigators:
Project Partners:	2 H Offshore Engineering Ltd BP
Department:	Naval Architecture & Marine Eng
Organisation:	University of Glasgow
Scheme:	Standard Research (Pre-FEC)
Starts:	26 November 2001	Ends:	25 May 2004	Value (£):	82,334
EPSRC Research Topic Classifications:	Coastal & Waterway Engineering Eng. Dynamics & Tribology Fluid Dynamics Oil & Gas Extraction
EPSRC Industrial Sector Classifications:	Energy
Related Grants:
Panel History:
Summary on Grant Application Form
As the offshore oil and gas industry moves into ever deeper waters and more hostile environments, there is an increasing concern on how to determine TLP/SPAR riser spacing to avoid possible clashing due to strong currents found at the locations of deepwater developments. The proposed project fits within the objectives of the 3rd Call of EPSRC/DTI Programme in Oil and Gas Extraction (May 2000), i.e. to improve the effectiveness of drilling and production technology. The project aims to investigate the fundamental mechanism of riser clashing caused by wake-induced instability. To achieve this we will build upon our expertise gathered from our work in the last three years and extend our two-dimensional methodology to the three-dimensional riser case. A mathematical model will be established for a pair of top tensioned vertical risers and a continuation/eigenvalue analysis will be employed to systematically obtain multiple solutions and to examine their stability. The emphasis will be on identifying the critical current speed for a given riser configuration, with the critical current speed being defined as the one at which the downstream riser loses its stability and moves towards and ultimately collides with the upstream riser. A timedomain simulation will also be carried out to investigate the post-stability-loss behaviour of the downstream riser. In particular, the motion of the downstream riser just before its collision with the upstream riser will be quantified. The key findings will be presented in graphs which can be readily exploited by riser designers.
Key Findings
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Potential use in non-academic contexts
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Impacts
Description This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk Summary Date Materialised
Sectors submitted by the Researcher
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
Project URL:
Further Information:
Organisation Website:	http://www.gla.ac.uk