A series of model tests were performed to investigate the response characteristics of a free hanging riser under forced oscillation conditions. The boundary conditions were considered to be fixed/free (fixed at the top and free at the bottom). The top end of the riser was fixed to the forced oscillator to give the effects of horizontal vessel motion. The model test was performed at the Ocean Engineering Basin of the Korea Research Institute of Ships and Ocean Engineering (KRISO). In this study, the displacements along the riser length were measured using underwater camera systems. Various oscillation conditions were considered in order to investigate the effects of period and amplitude. The oscillation period was determined considering the eigenvalues in the in-line (IL) response. The IL responses of the experiment were compared with the time simulation results of OrcaFlex. The responses of two results had a good agreement on time series, statistical value, and snapshot. The cross-flow (CF) responses along the riser length in the experiment were determined by the Keulegan-Carpenter number at each point of the riser. A comparison result of the IL and CF responses shows that they were excited by different dominant frequencies from the top-end motion and vortex shedding, respectively. While one top-end oscillation frequency appeared in the IL, multi-peak frequencies were investigated at all positions along the riser length in the CF, which is induced by traveling waves.
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December 2020
December 01 2020
A Model Test on the Response Characteristics of a Free Hanging Riser
Yong-Ju Kwon
;
Yong-Ju Kwon
Korea Research Institute of Ships and Ocean Engineering (KRISO)
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Dongho Jung
;
Dongho Jung
Korea Research Institute of Ships and Ocean Engineering (KRISO)
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Byeongwon Park
;
Byeongwon Park
Korea Research Institute of Ships and Ocean Engineering (KRISO)
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Jae-Hawn Jung
;
Jae-Hawn Jung
Korea Research Institute of Ships and Ocean Engineering (KRISO)
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Seunghoon Oh
Seunghoon Oh
Korea Research Institute of Ships and Ocean Engineering (KRISO)
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Int. J. Offshore Polar Eng. 30 (04): 447–455.
Paper Number:
ISOPE-20-30-4-447
Article history
Received:
April 16 2019
Published Online:
December 01 2020
Accepted:
December 01 2020
Citation
Kwon, Yong-Ju, Jung, Dongho, Park, Byeongwon, Jung, Jae-Hawn, and Seunghoon Oh. "A Model Test on the Response Characteristics of a Free Hanging Riser." Int. J. Offshore Polar Eng. 30 (2020): 447–455. doi: https://doi.org/10.17736/ijope.2020.ts21
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