Picture of wind turbine against blue sky

Open Access research with a real impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde research outputs.

The Energy Systems Research Unit (ESRU) within Strathclyde's Department of Mechanical and Aerospace Engineering is producing Open Access research that can help society deploy and optimise renewable energy systems, such as wind turbine technology.

Explore wind turbine research in Strathprints

Explore all of Strathclyde's Open Access research content

Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents

Srinil, N. and O'Brien, P. and Wiercigrocha, M. (2010) Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents. In: The 29th International Conference on Ocean, Offshore and Arctic Engineering, 2010-06-06 - 2010-06-11.

This is the latest version of this item.

[img]
Preview
PDF (strathprints018595.pdf)
strathprints018595.pdf

Download (862kB) | Preview

Abstract

This paper presents a general theoretical reduced-order model capable of evaluating the multi-mode nonlinear dynamics of marine risers subject to uniform and sheared currents. The main objectives are to predict the vortex-induced vibration responses and parametrically compare between numerical and experimental results. The emphasis is placed on the analysis of cross-flow vibrations due to unsteady lift forces. The nonlinear equations governing riser axial/transversal motions are derived based on a top-tensioned beam model with typical pinned-pinned boundary conditions. The riser geometric nonlinearities owing to possible large dynamic displacements and multi-mode interactions are accounted for. To approximate the space-time varying lift force, the empirical hydrodynamic model, based on a nonlinear van der Pol wake oscillator with a distributed diffusive term, is used. A low-dimensional dynamic model and computationally-robust time-domain tool are then developed to evaluate the multi-mode fluid-riser interactions. These are very useful in dealing with large parametric studies involving varying system parameters.

Available Versions of this Item

  • Numerical and experimental comparisons of vortex-induced vibrations of marine risers in uniform/sheared currents. (deposited 07 Apr 2010 09:40) [Currently Displayed]