Numerical Modeling of Free-Surface Wave Effects on Flexural Vibration of Floating Structures

Sepehrirahnama, S; Ong, ET; Lee, HP; Lim, KM

Numerical Modeling of Free-Surface Wave Effects on Flexural Vibration of Floating Structures

Sepehrirahnama, S

Ong, ET Lee, HP Lim, KM

Permalink

Publisher:: WORLD SCIENTIFIC PUBL CO PTE LTD
Publication Type:: Journal Article
Citation:: INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS, 2020, 17, (5)
Issue Date:: 2020-06-01

Closed Access

	Filename	Description	Size
	3141-11055-1-PB.pdf		885.59 kB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Sepehrirahnama, S https://orcid.org/0000-0002-3280-3321
dc.contributor.author	Ong, ET
dc.contributor.author	Lee, HP
dc.contributor.author	Lim, KM
dc.date.accessioned	2021-04-23T02:59:49Z
dc.date.available	2021-04-23T02:59:49Z
dc.date.issued	2020-06-01
dc.identifier.citation	INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS, 2020, 17, (5)
dc.identifier.issn	0219-8762
dc.identifier.issn	1793-6969
dc.identifier.uri	http://hdl.handle.net/10453/148295
dc.description.abstract	<jats:p> To investigate flexural vibration of structures in a fluid, a numerical algorithm was developed to relate the added mass and damping effects of the fluid to each mode of vibration. These are separate from the traditional added mass associated with rigid body motion, such as the translational motion along Cartesian axes. In this formulation, small-amplitude free surface waves were accounted for by using a nonsingular implementation of the free-surface Green’s function for a potential flow solver based on Boundary Element Method. The formulation was applied to the forced vibration of structures, namely, a hemispherical shell and a reinforced half cylinder with typical dimensions of ships and offshore structures, to obtain their dynamic response at various excitation frequencies. It is observed that resonance frequency of the structure, in contact with water, decreases due to the added mass effect. The influence of the free-surface wave on the fluid loading was investigated for large structures. It is simpler to relate the fluid added mass to mode shapes rather than distribution of fluid load over wetted surface of the structure in engineering simulations. Moreover, it is found that the vibration energy radiated away by the fluid surface wave has little influence on the vibration response of the shell structures. </jats:p>
dc.language	English
dc.publisher	WORLD SCIENTIFIC PUBL CO PTE LTD
dc.relation.ispartof	INTERNATIONAL JOURNAL OF COMPUTATIONAL METHODS
dc.relation.isbasedon	10.1142/S0219876219400164
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	01 Mathematical Sciences, 08 Information and Computing Sciences, 09 Engineering
dc.subject.classification	Applied Mathematics
dc.title	Numerical Modeling of Free-Surface Wave Effects on Flexural Vibration of Floating Structures
dc.type	Journal Article
utslib.citation.volume	17
utslib.location.activity	Rome, ITALY
utslib.for	01 Mathematical Sciences
utslib.for	08 Information and Computing Sciences
utslib.for	09 Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	closed_access	*
pubs.consider-herdc	false
dc.date.updated	2021-04-23T02:59:48Z
pubs.issue	5
pubs.publication-status	Published
pubs.volume	17
utslib.citation.issue	5

Abstract:

To investigate flexural vibration of structures in a fluid, a numerical algorithm was developed to relate the added mass and damping effects of the fluid to each mode of vibration. These are separate from the traditional added mass associated with rigid body motion, such as the translational motion along Cartesian axes. In this formulation, small-amplitude free surface waves were accounted for by using a nonsingular implementation of the free-surface Green’s function for a potential flow solver based on Boundary Element Method. The formulation was applied to the forced vibration of structures, namely, a hemispherical shell and a reinforced half cylinder with typical dimensions of ships and offshore structures, to obtain their dynamic response at various excitation frequencies. It is observed that resonance frequency of the structure, in contact with water, decreases due to the added mass effect. The influence of the free-surface wave on the fluid loading was investigated for large structures. It is simpler to relate the fluid added mass to mode shapes rather than distribution of fluid load over wetted surface of the structure in engineering simulations. Moreover, it is found that the vibration energy radiated away by the fluid surface wave has little influence on the vibration response of the shell structures.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/148295