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On the parametric dependence of Springing Damping of TLP and Spar Columns

Lookup NU author(s): Professor Longbin Tao

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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 b from 89236 to 435298. 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 2pi/(D/Td)(D = diameter of the cylinder, and Td = 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.

Publication metadata

Author(s): Tao L, Thiagarajan K, Cheng L

Publication type: Article

Publication status: Published

Journal: Applied Ocean Research

Year: 2000

Volume: 22

Issue: 5

Pages: 281-294

Print publication date: 23/10/2000

Date deposited: 07/05/2010

ISSN (print): 0141-1187

ISSN (electronic): 1879-1549

Publisher: Pergamon

URL: http://dx.doi.org/10.1016/S0141-1187(00)00017-1

DOI: 10.1016/S0141-1187(00)00017-1

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