Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations

N. Srinil, M. Wiercigrocha, P. O'Brien, KTP (Funder)

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

This paper investigates nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations based on a computationally efficient reduced-order fluid-structure interaction model. Cross-flow responses as a result of a steady uniform current are considered. The geometrically nonlinear equations of riser motion are coupled with nonlinear wake oscillators which have been modified to capture the effect of initial curvatures of curved cylinder and to approximate the space-time varying hydrodynamic lift forces. The main objectives are to provide new insights into the vortex-induced vibration characteristics of risers under external and internal resonances and to distinguish nonlinear dynamic behaviors between curved catenary and straight toptensioned risers. The analyses of multi-mode contributions, lock-in regimes, response amplitudes, resonant nonlinear modes and curvatures are carried out and several interesting aspects are highlighted.
LanguageEnglish
Pages1329-1336
Number of pages7
Publication statusPublished - 2009
EventThe 19th International Offshore and Polar Engineering - Osaka
Duration: 21 Jul 200926 Jul 2009

Conference

ConferenceThe 19th International Offshore and Polar Engineering
CityOsaka
Period21/07/0926/07/09

Fingerprint

Vortex flow
Fluid structure interaction
Nonlinear equations
Vibrations (mechanical)
Hydrodynamics

Keywords

  • Subsea riser
  • Vortex-induced vibration
  • Wake oscillator
  • Fluid-structure interaction
  • Reduced-order model
  • Multi-mode interaction
  • Resonant nonlinear mode

Cite this

Srinil, N., Wiercigrocha, M., O'Brien, P., & KTP (Funder) (2009). Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations. 1329-1336. Paper presented at The 19th International Offshore and Polar Engineering, Osaka, .
Srinil, N. ; Wiercigrocha, M. ; O'Brien, P. ; KTP (Funder). / Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations. Paper presented at The 19th International Offshore and Polar Engineering, Osaka, .7 p.
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abstract = "This paper investigates nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations based on a computationally efficient reduced-order fluid-structure interaction model. Cross-flow responses as a result of a steady uniform current are considered. The geometrically nonlinear equations of riser motion are coupled with nonlinear wake oscillators which have been modified to capture the effect of initial curvatures of curved cylinder and to approximate the space-time varying hydrodynamic lift forces. The main objectives are to provide new insights into the vortex-induced vibration characteristics of risers under external and internal resonances and to distinguish nonlinear dynamic behaviors between curved catenary and straight toptensioned risers. The analyses of multi-mode contributions, lock-in regimes, response amplitudes, resonant nonlinear modes and curvatures are carried out and several interesting aspects are highlighted.",
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year = "2009",
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note = "The 19th International Offshore and Polar Engineering ; Conference date: 21-07-2009 Through 26-07-2009",

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Srinil, N, Wiercigrocha, M, O'Brien, P & KTP (Funder) 2009, 'Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations' Paper presented at The 19th International Offshore and Polar Engineering, Osaka, 21/07/09 - 26/07/09, pp. 1329-1336.

Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations. / Srinil, N.; Wiercigrocha, M.; O'Brien, P.; KTP (Funder).

2009. 1329-1336 Paper presented at The 19th International Offshore and Polar Engineering, Osaka, .

Research output: Contribution to conferencePaper

TY - CONF

T1 - Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations

AU - Srinil, N.

AU - Wiercigrocha, M.

AU - O'Brien, P.

AU - KTP (Funder)

PY - 2009

Y1 - 2009

N2 - This paper investigates nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations based on a computationally efficient reduced-order fluid-structure interaction model. Cross-flow responses as a result of a steady uniform current are considered. The geometrically nonlinear equations of riser motion are coupled with nonlinear wake oscillators which have been modified to capture the effect of initial curvatures of curved cylinder and to approximate the space-time varying hydrodynamic lift forces. The main objectives are to provide new insights into the vortex-induced vibration characteristics of risers under external and internal resonances and to distinguish nonlinear dynamic behaviors between curved catenary and straight toptensioned risers. The analyses of multi-mode contributions, lock-in regimes, response amplitudes, resonant nonlinear modes and curvatures are carried out and several interesting aspects are highlighted.

AB - This paper investigates nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations based on a computationally efficient reduced-order fluid-structure interaction model. Cross-flow responses as a result of a steady uniform current are considered. The geometrically nonlinear equations of riser motion are coupled with nonlinear wake oscillators which have been modified to capture the effect of initial curvatures of curved cylinder and to approximate the space-time varying hydrodynamic lift forces. The main objectives are to provide new insights into the vortex-induced vibration characteristics of risers under external and internal resonances and to distinguish nonlinear dynamic behaviors between curved catenary and straight toptensioned risers. The analyses of multi-mode contributions, lock-in regimes, response amplitudes, resonant nonlinear modes and curvatures are carried out and several interesting aspects are highlighted.

KW - Subsea riser

KW - Vortex-induced vibration

KW - Wake oscillator

KW - Fluid-structure interaction

KW - Reduced-order model

KW - Multi-mode interaction

KW - Resonant nonlinear mode

UR - http://www.isope.org/publications/proceedings/ISOPE/ISOPE%202009/start.htm

M3 - Paper

SP - 1329

EP - 1336

ER -

Srinil N, Wiercigrocha M, O'Brien P, KTP (Funder). Nonlinear multi-mode interactions in subsea risers undergoing vortex-induced vibrations. 2009. Paper presented at The 19th International Offshore and Polar Engineering, Osaka, .