Vortex-induced response of a long flexible marine riser in a shear current

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ConferenceInternational Symposium on Technology of Ultra Deep Ocean Engineering, 1-2 February 2005, Tokyo, Japan
Subjectflexible marine riser; large deformations; deep water; lumped mass; Kane's method; ocean current; hydrodynamic loads; experimental data
AbstractThe response of a long flexible marine riser in a shear current is investigated using a lumpedmass numerical model. The objective of the model is to provide a simulation tool for assessing the motions and stresses (longitudinal and bending) in a deep-water riser, subject to surface waves and deep-ocean currents. The riser is modelled as a beam of hollow circular section divided into segments. Structural forces are modeled by extensional springs and dampers within the segments and rotational springs and dampers at the joints between the segments. Fluid structure coupling is achieved by application of the hydrodynamic loads via drag, lift and addedmass coefficients using the instantaneous relative velocities and accelerations between the fluid field and the riser segments. The effects of flow and pressure of a fluid within the riser are included in the model. The equations of motion are assembled using Kane's multi-body dynamics method and solved using a robust implementation of the Runge-Kutta method provided in MATLABÔ. The model is implemented to simulate the results observed in various physicalmodel experiments that have been conducted at the National Research Council Canada. Results obtained using experimental data are included in this paper.
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AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Peer reviewedNo
NRC number6211
NPARC number8896191
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Record identifierb626cc6c-faf0-499f-9e7f-d6bb2c706a43
Record created2009-04-22
Record modified2016-05-09
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