A multi-strip numerical method combining solution of the incompressible Reynolds Averaged Navier-Stokes (RANS) equations with a finite-element structural dynamics response has been developed previously to analyze the flow-structure interaction of a flexible riser subjected to fixed and non-uniform, two-dimensional shear currents. In this paper, we expand on the previous work using the tool to numerically compute the VIV loads and motions of a vertically tensioned riser in a stepped current. The flow conditions for this stepped current configuration were chosen to match a set of laboratory experiments carried out in the Delta Flume at Delft Hydraulics. In addition to the stepped current, the multi-strip method was extended to accommodate a three-dimensional skew current exposed to a vertically tensioned riser. Note that in this case, the skew current is non-uniform in both direction and magnitude, and the flow conditions and riser configuration were chosen to match a set of rotating-rig experiments made by Marintek. For both configurations (stepped and skewed currents), comparisons of in-line and transverse VIV displacements are presented between numerical and experimental results.
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ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
June 12–17, 2005
Halkidiki, Greece
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4195-2
PROCEEDINGS PAPER
VIV Analysis of a Riser Subjected to Step and Multi-Directional Currents
Karl W. Schulz,
Karl W. Schulz
University of Texas at Austin, Austin, TX
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Trond S. Meling
Trond S. Meling
Statoil ASA, Stavanger, Norway
Search for other works by this author on:
Karl W. Schulz
University of Texas at Austin, Austin, TX
Trond S. Meling
Statoil ASA, Stavanger, Norway
Paper No:
OMAE2005-67144, pp. 383-389; 7 pages
Published Online:
November 11, 2008
Citation
Schulz, KW, & Meling, TS. "VIV Analysis of a Riser Subjected to Step and Multi-Directional Currents." Proceedings of the ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering. 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 1, Parts A and B. Halkidiki, Greece. June 12–17, 2005. pp. 383-389. ASME. https://doi.org/10.1115/OMAE2005-67144
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