On the parametric dependence of springing damping of TLP and Spar columns

L. Tao, K.P. Thiagarajan, L. Cheng

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The non-linear viscous damping forces on a Tension Leg Platform (TLP) column experiencing 'springing' vibration are calculated by directly solving the Navier-Stokes equations. Different characteristics of heave damping have been found in two different regimes in the ranges of Keulegan-Carpenter (KC) from 0.001 to 1.0 and β from 89 236 to 435 298. At very low KC, the heave damping force tends to be approximately linear with the velocity, whereas a definite non-linear dependence on the velocity has been found as KC increases. It is found that the laminar boundary layer theory based on the infinite length circular cylinder assumption is still suitable to the friction drag estimation at very low KC, but the leading edge effect is not negligible as KC approaches 2π(D/T(d)) (D = diameter of the cylinder, and T(d) = the draft of the cylinder). From the present numerical estimation, one can conclude that a uniform scaling law cannot be applied, and the scaling laws for the heave damping estimation of a TLP column in two different regimes have been presented. (C) 2000 Elsevier Science Ltd. All rights reserved.

LanguageEnglish
Pages281-294
Number of pages14
JournalApplied Ocean Research
Volume22
Issue number5
DOIs
Publication statusPublished - 23 Oct 2000

Fingerprint

Tension-leg platforms
Damping
Scaling laws
Laminar boundary layer
Circular cylinders
Navier Stokes equations
Drag
Friction

Keywords

  • form drag
  • hydrodynamic damping
  • skin friction drag
  • tension leg platform

Cite this

Tao, L. ; Thiagarajan, K.P. ; Cheng, L. / On the parametric dependence of springing damping of TLP and Spar columns. In: Applied Ocean Research. 2000 ; Vol. 22, No. 5. pp. 281-294.
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On the parametric dependence of springing damping of TLP and Spar columns. / Tao, L.; Thiagarajan, K.P.; Cheng, L.

In: Applied Ocean Research, Vol. 22, No. 5, 23.10.2000, p. 281-294.

Research output: Contribution to journalArticle

TY - JOUR

T1 - On the parametric dependence of springing damping of TLP and Spar columns

AU - Tao, L.

AU - Thiagarajan, K.P.

AU - Cheng, L.

PY - 2000/10/23

Y1 - 2000/10/23

N2 - The non-linear viscous damping forces on a Tension Leg Platform (TLP) column experiencing 'springing' vibration are calculated by directly solving the Navier-Stokes equations. Different characteristics of heave damping have been found in two different regimes in the ranges of Keulegan-Carpenter (KC) from 0.001 to 1.0 and β from 89 236 to 435 298. At very low KC, the heave damping force tends to be approximately linear with the velocity, whereas a definite non-linear dependence on the velocity has been found as KC increases. It is found that the laminar boundary layer theory based on the infinite length circular cylinder assumption is still suitable to the friction drag estimation at very low KC, but the leading edge effect is not negligible as KC approaches 2π(D/T(d)) (D = diameter of the cylinder, and T(d) = the draft of the cylinder). From the present numerical estimation, one can conclude that a uniform scaling law cannot be applied, and the scaling laws for the heave damping estimation of a TLP column in two different regimes have been presented. (C) 2000 Elsevier Science Ltd. All rights reserved.

AB - The non-linear viscous damping forces on a Tension Leg Platform (TLP) column experiencing 'springing' vibration are calculated by directly solving the Navier-Stokes equations. Different characteristics of heave damping have been found in two different regimes in the ranges of Keulegan-Carpenter (KC) from 0.001 to 1.0 and β from 89 236 to 435 298. At very low KC, the heave damping force tends to be approximately linear with the velocity, whereas a definite non-linear dependence on the velocity has been found as KC increases. It is found that the laminar boundary layer theory based on the infinite length circular cylinder assumption is still suitable to the friction drag estimation at very low KC, but the leading edge effect is not negligible as KC approaches 2π(D/T(d)) (D = diameter of the cylinder, and T(d) = the draft of the cylinder). From the present numerical estimation, one can conclude that a uniform scaling law cannot be applied, and the scaling laws for the heave damping estimation of a TLP column in two different regimes have been presented. (C) 2000 Elsevier Science Ltd. All rights reserved.

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KW - tension leg platform

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