Reciprocal hydrodynamic response estimation in a random spreading sea

Jiannan Yang; Robin Langley; Richard Lines

doi:10.48550/arXiv.2306.11058

Reciprocal hydrodynamic response estimation in a random spreading sea

Jiannan Yang, Robin Langley, Richard Lines

Physics

Research output: Working paper › Preprint

Abstract

Direct estimation of the hydrodynamic response of an offshore structure in a random spreading sea can lead to large computational costs. In this paper the actual spreading sea is replaced by an idealised diffuse wave field and the diffuse field reciprocity (DFR) relationship is derived analytically and verified against diffraction analysis for offshore application. The DFR approach provides an analytical expression for the estimation of the wave loading spectrum in a spreading sea. It is very efficient because only the added damping coefficients are required. Furthermore, if normalised to the peak amplitude of a spreading sea, an upper bound response can be obtained using the reciprocal approach. And this is demonstrated using a spar type floating wind turbine. Given that the hydrodynamic coefficients are routine outputs for offshore structural design, engineers would obtain the upper bound response without additional computational cost using this new approach.

Original language	Undefined/Unknown
Publisher	arXiv
DOIs	https://doi.org/10.48550/arXiv.2306.11058
Publication status	Published - 19 Jun 2023

Bibliographical note

5 figures; 1 table

Keywords

physics.flu-dyn
physics.app-ph
stat.AP

Access to Document

10.48550/arXiv.2306.11058Licence: CC BY

2306.11058v1

Cite this

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title = "Reciprocal hydrodynamic response estimation in a random spreading sea",

abstract = " Direct estimation of the hydrodynamic response of an offshore structure in a random spreading sea can lead to large computational costs. In this paper the actual spreading sea is replaced by an idealised diffuse wave field and the diffuse field reciprocity (DFR) relationship is derived analytically and verified against diffraction analysis for offshore application. The DFR approach provides an analytical expression for the estimation of the wave loading spectrum in a spreading sea. It is very efficient because only the added damping coefficients are required. Furthermore, if normalised to the peak amplitude of a spreading sea, an upper bound response can be obtained using the reciprocal approach. And this is demonstrated using a spar type floating wind turbine. Given that the hydrodynamic coefficients are routine outputs for offshore structural design, engineers would obtain the upper bound response without additional computational cost using this new approach. ",

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author = "Jiannan Yang and Robin Langley and Richard Lines",

note = "5 figures; 1 table",

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T1 - Reciprocal hydrodynamic response estimation in a random spreading sea

AU - Yang, Jiannan

AU - Langley, Robin

AU - Lines, Richard

N1 - 5 figures; 1 table

PY - 2023/6/19

Y1 - 2023/6/19

N2 - Direct estimation of the hydrodynamic response of an offshore structure in a random spreading sea can lead to large computational costs. In this paper the actual spreading sea is replaced by an idealised diffuse wave field and the diffuse field reciprocity (DFR) relationship is derived analytically and verified against diffraction analysis for offshore application. The DFR approach provides an analytical expression for the estimation of the wave loading spectrum in a spreading sea. It is very efficient because only the added damping coefficients are required. Furthermore, if normalised to the peak amplitude of a spreading sea, an upper bound response can be obtained using the reciprocal approach. And this is demonstrated using a spar type floating wind turbine. Given that the hydrodynamic coefficients are routine outputs for offshore structural design, engineers would obtain the upper bound response without additional computational cost using this new approach.

AB - Direct estimation of the hydrodynamic response of an offshore structure in a random spreading sea can lead to large computational costs. In this paper the actual spreading sea is replaced by an idealised diffuse wave field and the diffuse field reciprocity (DFR) relationship is derived analytically and verified against diffraction analysis for offshore application. The DFR approach provides an analytical expression for the estimation of the wave loading spectrum in a spreading sea. It is very efficient because only the added damping coefficients are required. Furthermore, if normalised to the peak amplitude of a spreading sea, an upper bound response can be obtained using the reciprocal approach. And this is demonstrated using a spar type floating wind turbine. Given that the hydrodynamic coefficients are routine outputs for offshore structural design, engineers would obtain the upper bound response without additional computational cost using this new approach.

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KW - physics.app-ph

KW - stat.AP

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