CFD approach to heave damping of spar with heave plates with experimental validation

Spar, tension leg platform, and semi-submersibles use heave plates to reduce heave response by increasing heave damping and added mass. Conventional practice is to use a linear damping ratio, which is typically obtained from free heave decay tests or Computational Fluid Dynamics (CFD) simulations. H...

Full description

Saved in:
Bibliographic Details
Published in:Applied ocean research 2021-03, Vol.108, p.102517, Article 102517
Main Authors: Rao, Mahesh J., Nallayarasu, S., Bhattacharyya, S.K.
Format: Article
Language:English
Subjects:
CFD
Damping
Decay
Fluid dynamics
Free heave decay
Heave damping
Heave plate
Heave response
Heaving
Hydrodynamics
Mass
Mathematical models
Offshore structures
Quadratic damping
Spar
Submersibles
Tension leg platforms
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Spar, tension leg platform, and semi-submersibles use heave plates to reduce heave response by increasing heave damping and added mass. Conventional practice is to use a linear damping ratio, which is typically obtained from free heave decay tests or Computational Fluid Dynamics (CFD) simulations. However, with the addition of heave plates, the system damping becomes nonlinear. Understanding such nonlinear damping behavior of spar with circular heave plates in various configurations could be useful in the design of heave compensation devices. Experimental and numerical investigation on heave damping and added mass of a scaled model of spar with a variety of heave plate configurations have been carried out using free heave decay for a range of initial heave displacements. Applicability of the linear and quadratic damping models have been assessed for all configurations. The effects of parameters such as heave plate diameter, location of heave plate above the keel, and spacing between two plates on damping and added mass have also been studied. Flow fields obtained from numerical simulations are presented, and their implication on damping discussed.
ISSN:0141-1187
1879-1549
DOI:10.1016/j.apor.2020.102517