A methodology for analyzing risers for in-line VIV fatigue damage has been developed that is based on the code SHEAR7, and laboratory in-line VIV coefficients. The in-line VIV fatigue in many instances governs the design of the riser since in-line VIV starts at a reduced velocity of about 1 whereas the threshold reduced velocity for cross flow VIV is about 4. The methodology can treat sheared currents on the basis of the cross flow VIV modeling in SHEAR7. Through the SHEAR7 modeling, the methodology removes conservatism implicit in the present ad hoc procedures for calculating riser in-line VIV response on the basis of the DNV-RP-F105 code. The reduction in conservatism is due to accounting properly for the power-in region in the VIV excitation, the hydrodynamic damping, and competing modal excitation (multiple mode response). The inline VIV coefficients have been derived from laboratory tests at the Norwegian University of Science and Technology (NTNU). The paper presents the in-line VIV coefficients, and examples to demonstrate the methodology for riser in sheared currents. The coefficients derived from the NTNU tests are functions of both the in-line VIV response amplitude and the reduced velocity. The coefficients presented in the paper are scaled test coefficients. The scaling of the NTNU coefficients assures that the methodology calculates in-line VIV amplitudes that are consistent with the response amplitudes in DNV-RP-F105 for the case of a simply supported riser in uniform current. This DNV code, although written for pipelines, has been extended to risers in sheared currents on the basis of conservative approaches.
Skip Nav Destination
Close
Sign In or Register for Account
ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
June 10–15, 2007
San Diego, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
0-7918-4269-X
PROCEEDINGS PAPER
Hydrodynamic Coefficients for Riser In-Line VIV in Sheared Currents
Djoni E. Sidarta,
Djoni E. Sidarta
Technip USA, Houston, TX
Search for other works by this author on:
Kostas F. Lambrakos,
Kostas F. Lambrakos
Technip USA, Houston, TX
Search for other works by this author on:
Carl M. Larsen
Carl M. Larsen
Norwegian University of Science and Technology, Trondheim, Norway
Search for other works by this author on:
Djoni E. Sidarta
Technip USA, Houston, TX
Kostas F. Lambrakos
Technip USA, Houston, TX
Carl M. Larsen
Norwegian University of Science and Technology, Trondheim, Norway
Paper No:
OMAE2007-29519, pp. 941-948; 8 pages
Published Online:
May 20, 2009
Citation
Sidarta, DE, Lambrakos, KF, & Larsen, CM. "Hydrodynamic Coefficients for Riser In-Line VIV in Sheared Currents." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 3: Pipeline and Riser Technology; CFD and VIV. San Diego, California, USA. June 10–15, 2007. pp. 941-948. ASME. https://doi.org/10.1115/OMAE2007-29519
Download citation file:
- Ris (Zotero)
- Reference Manager
- EasyBib
- Bookends
- Mendeley
- Papers
- EndNote
- RefWorks
- BibTex
- ProCite
- Medlars
Close
Sign In
3
Views
0
Citations
Related Proceedings Papers
Related Articles
Characteristic Analysis of VIV-Induced Fatigue Damage of Top Tensioned Risers Based on Simplified Model
J. Offshore Mech. Arct. Eng (May,2011)
Improved Current Profile Criteria for Deepwater Riser Design
J. Offshore Mech. Arct. Eng (November,2003)
Prediction of Combined Inline and Crossflow Vortex-Induced Vibrations Response of Deepwater Risers
J. Offshore Mech. Arct. Eng (August,2019)
Related Chapters
Vortex-Induced Vibration
Flow Induced Vibration of Power and Process Plant Components: A Practical Workbook
Gas Management System
Pipeline System Automation and Control
System Automation
Pipeline Operation & Maintenance: A Practical Approach, Second Edition