Fast computation for vibration study of partially submerged structures using low resolution hydrodynamic model

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

Fast computation for vibration study of partially submerged structures using low resolution hydrodynamic model

Sepehrirahnama, S

Ong, ET Lee, HP Lim, KM

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Publisher:: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Type:: Journal Article
Citation:: Journal of Fluids and Structures, 2019, 91
Issue Date:: 2019-11-01

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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	2022-09-26T00:24:31Z
dc.date.available	2022-09-26T00:24:31Z
dc.date.issued	2019-11-01
dc.identifier.citation	Journal of Fluids and Structures, 2019, 91
dc.identifier.issn	0889-9746
dc.identifier.issn	1095-8622
dc.identifier.uri	http://hdl.handle.net/10453/162058
dc.description.abstract	A fast computation scheme is presented for simulating fluid–structure interaction of partially submerged structures. Fluid added mass is simulated using the boundary element method, which only requires a mesh at the fluid–structure interface while satisfying the far field boundary conditions in a semi-infinite domain. The boundary element solver is coupled to a finite element solver for structural vibration analysis. To speed up the boundary element simulation, a low resolution and geometrically simplified surface mesh was used. A projection scheme is introduced to map fluid elements to structural elements, allowing proper transfer of displacement and fluid loading between the two solvers. A series of low-resolution meshes for a realistic container ship model were used to study the efficiency of the proposed scheme, comparing the errors incurred in calculating the wet natural frequencies against the speed-up in computation. With a 20 times decrease in the number of boundary elements, the relative error in wet natural frequency calculation was found to be less than 10%, while computation speed-up was found to be almost 500 folds.
dc.language	English
dc.publisher	ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
dc.relation.ispartof	Journal of Fluids and Structures
dc.relation.isbasedon	10.1016/j.jfluidstructs.2019.102756
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	09 Engineering
dc.subject.classification	Fluids & Plasmas
dc.title	Fast computation for vibration study of partially submerged structures using low resolution hydrodynamic model
dc.type	Journal Article
utslib.citation.volume	91
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	*
dc.date.updated	2022-09-26T00:24:26Z
pubs.publication-status	Published
pubs.volume	91

Abstract:

A fast computation scheme is presented for simulating fluid–structure interaction of partially submerged structures. Fluid added mass is simulated using the boundary element method, which only requires a mesh at the fluid–structure interface while satisfying the far field boundary conditions in a semi-infinite domain. The boundary element solver is coupled to a finite element solver for structural vibration analysis. To speed up the boundary element simulation, a low resolution and geometrically simplified surface mesh was used. A projection scheme is introduced to map fluid elements to structural elements, allowing proper transfer of displacement and fluid loading between the two solvers. A series of low-resolution meshes for a realistic container ship model were used to study the efficiency of the proposed scheme, comparing the errors incurred in calculating the wet natural frequencies against the speed-up in computation. With a 20 times decrease in the number of boundary elements, the relative error in wet natural frequency calculation was found to be less than 10%, while computation speed-up was found to be almost 500 folds.

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http://hdl.handle.net/10453/162058