Coupled Inline-Cross Flow VIV Hydrodynamic Coefficients Database
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v002t08a087-omae2014-24659.pdf
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Author(s)
Dahl, Jason M.
Modarres-Sadeghi, Yahya
Zheng, Haining
Triantafyllou, Michael S
Date Issued
July 2014
Journal
ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering
Publisher
ASME International
Citation
Zheng, Haining, Jason M. Dahl, Yahya Modarres-Sadeghi, and Michael S. Triantafyllou. “Coupled Inline-Cross Flow VIV Hydrodynamic Coefficients Database.” ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering, 8-13 June, 2014, San Francisco, California, USA, ASME, 2014. © 2014 by ASME
Version
Final published version
Abstract
Vortex Induced Vibrations (VIV) cause major fatigue damage to long slender bodies and have been extensively studied in the past decades. While most of the past research focused on the cross flow direction, it was recently shown that the inline motion in the direction of the flow has a major impact on the fatigue life damage due to its higher frequency (second harmonic) and more importantly, its coupling with the crossflow motion, which triggers a third harmonic stress component in the cross flow direction. In this paper, the coupled inline-crossflow VIV problem is addressed from semiempirical modeling of fluid forces. Extensive fine grid forced inline-crossflow VIV experiments were designed and carried out in the MIT towing tank. An inline-crossflow VIV hydrodynamics coefficients database was newly constructed using the experimental results and it is expected to be useful for other semi empirical programs predicting coupled inlinecrossflow VIV in the field. Several key hydrodynamic coefficients in the database, including lift force coefficients, drag force coefficients and added mass coefficients, were systematically analyzed. The coefficients in the crossflow and the inline directions were found to have strong dependency on the phase between the inline and crossflow motions.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1115/OMAE2014-24659
