Hydrodynamic considerations for FLNG concepts

Clauss, GF; Mavrakos, SA; Sprenger, F; Testa, D; Dudek, M

dc.contributor.author	Clauss, GF	en
dc.contributor.author	Mavrakos, SA	en
dc.contributor.author	Sprenger, F	en
dc.contributor.author	Testa, D	en
dc.contributor.author	Dudek, M	en
dc.date.accessioned	2014-03-01T02:53:18Z
dc.date.available	2014-03-01T02:53:18Z
dc.date.issued	2011	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36226
dc.subject.other	Cargo tanks	en
dc.subject.other	Drift motion	en
dc.subject.other	Free fluids	en
dc.subject.other	Frequency shift	en
dc.subject.other	High energy densities	en
dc.subject.other	Intact stability	en
dc.subject.other	Liquid motion	en
dc.subject.other	Marine locations	en
dc.subject.other	Motion behavior	en
dc.subject.other	Multi-body	en
dc.subject.other	Re-gasification	en
dc.subject.other	Resonant tanks	en
dc.subject.other	Surge motions	en
dc.subject.other	Transfer period	en
dc.subject.other	Transport distances	en
dc.subject.other	Vessel motions	en
dc.subject.other	Arctic engineering	en
dc.subject.other	Gas supply	en
dc.subject.other	Hulls (ship)	en
dc.subject.other	Liquefied natural gas	en
dc.subject.other	Natural frequencies	en
dc.subject.other	Natural gas transportation	en
dc.subject.other	Tanks (containers)	en
dc.subject.other	Tankers (ships)	en
dc.title	Hydrodynamic considerations for FLNG concepts	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1115/OMAE2011-50132	en
heal.identifier.secondary	http://dx.doi.org/10.1115/OMAE2011-50132	en
heal.publicationDate	2011	en
heal.abstract	The current demand in liquefied natural gas (LNG) encouraged the design of various concepts for floating LNG (FLNG) liquefaction or regasification facilities. With increasing transport distance, e.g. from remote marine locations to the onshore gas supply net, gas pipelines become uneconomic compared to shuttle carriers for LNG (LNGC). Due to its high energy density, offshore transfer from processing terminals to carriers and from carriers back to receiving terminals has to be analyzed in detail. During the transfer period, free fluid surfaces occurring in the cargo tanks of the LNGC are leading to a significant decrease of the initial intact stability and altered motion behavior. This paper focusses on the influence of resonant tank sloshing on the LNGC's roll and surge motions. Analyses of transverse and longitudinal sloshing yield a surprising phenomenon: the frequency shift Dw between the theoretical natural frequency of the tank alone and the respective motion peak for a vessel with four tanks mounted to the hull. Force measurements between tank and hull reveal a peak at the tank's natural frequency that causes strong liquid motions with related forces and moments on the hull but no increased vessel motions. Additional investigations comprise the offloading situation with a multi-body arrangement of LNGC and a FLNG (the MPLS20 system) in tandem and briefly also in side-by-side configuration. The slow drift motions on the turretmoored FLNG are exemplarily investigated in head seas. Copyright © 2011 by ASME.	en
heal.journalName	Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE	en
dc.identifier.doi	10.1115/OMAE2011-50132	en
dc.identifier.volume	1	en
dc.identifier.spage	723	en
dc.identifier.epage	735	en