An approximation model for nonlinear wave induced moment on a vertical surface-piercing column

Xingya Feng; P. H. Taylor; S. Dai; S. Day; T. A.A. Adcock

An approximation model for nonlinear wave induced moment on a vertical surface-piercing column

Xingya Feng, P. H. Taylor, S. Dai, S. Day, T. A.A. Adcock

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

1 Citation (Scopus)

23 Downloads (Pure)

Abstract

This study focuses on the analysis of the higher harmonic wave moments (around the seabed) on a vertical cylinder under the action of focused wave groups. The moment is known to be more nonlinear than the horizontal wave force; however, it is not very much investigated in the literature due to the difficulty of measuring accurately the mudline moment. We analysed the carefully measured wave loads from the tests in the Kelvin tank in the University of Strathclyde where a four-phase method is employed to extract the harmonic wave loads. The mudline moment shows a ‘Stokes-like’ underlying harmonic structure similar to the horizontal force. An approximation model is established to estimate the harmonic moment from the linear moment component. The model requires the nonlinear horizontal force coefficients and the moment arm of each harmonic. The moment arm for each higher harmonic is found from the measured forces and moments. The approximation model is demonstrated to be successful from both the measured data and numerical simulation.

Original language	English
Title of host publication	30th International Ocean and Polar Engineering Conference
Publisher	International Society of Offshore and Polar Engineers
Pages	1889-1895
Number of pages	7
ISBN (Electronic)	9781880653845
Publication status	E-pub ahead of print - 11 Oct 2020
Event	30th International Ocean and Polar Engineering Conference, ISOPE 2020 - Virtual, Online, China Duration: 11 Oct 2020 → 16 Oct 2020

Publication series

Name	Proceedings of the International Offshore and Polar Engineering Conference
Volume	2020-October
ISSN (Print)	1098-6189
ISSN (Electronic)	1555-1792

Conference

Conference	30th International Ocean and Polar Engineering Conference, ISOPE 2020
Country/Territory	China
City	Virtual, Online
Period	11/10/20 → 16/10/20

Funding

This work was funded by UK/China ORE funding (EPSRC grant EP/R007632/1) and the United Kingdom Centre for Marine Energy Research (UKCMER) (EPSRSC grant P/R007632/1). The authors would also like to acknowledge the use of the University of Oxford Advanced Research Computing (ARC) facility in carrying out the numerical work.

Keywords

focused waves
higher harmonics
monopile
nonlinear loads
offshore wind
arctic engineering
structural loads
harmonic structures

Access to Document

Feng-etal-ISOPE2020-An-approximation-model-nonlinear-wave induced-moment-vertical-surface-piercing-columnAccepted author manuscript, 523 KB

https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE20/All-ISOPE20/ISOPE-I-20-3127/446574

Cite this

Feng, X., Taylor, P. H., Dai, S., Day, S., & Adcock, T. A. A. (2020). An approximation model for nonlinear wave induced moment on a vertical surface-piercing column. In 30th International Ocean and Polar Engineering Conference (pp. 1889-1895). Article ISOPE-I-20-3127 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2020-October). International Society of Offshore and Polar Engineers. Advance online publication. https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE20/All-ISOPE20/ISOPE-I-20-3127/446574

@inproceedings{72e4877c420642e4a7d01567c739473b,

title = "An approximation model for nonlinear wave induced moment on a vertical surface-piercing column",

abstract = "This study focuses on the analysis of the higher harmonic wave moments (around the seabed) on a vertical cylinder under the action of focused wave groups. The moment is known to be more nonlinear than the horizontal wave force; however, it is not very much investigated in the literature due to the difficulty of measuring accurately the mudline moment. We analysed the carefully measured wave loads from the tests in the Kelvin tank in the University of Strathclyde where a four-phase method is employed to extract the harmonic wave loads. The mudline moment shows a {\textquoteleft}Stokes-like{\textquoteright} underlying harmonic structure similar to the horizontal force. An approximation model is established to estimate the harmonic moment from the linear moment component. The model requires the nonlinear horizontal force coefficients and the moment arm of each harmonic. The moment arm for each higher harmonic is found from the measured forces and moments. The approximation model is demonstrated to be successful from both the measured data and numerical simulation.",

keywords = "focused waves, higher harmonics, monopile, nonlinear loads, offshore wind, arctic engineering, structural loads, harmonic structures",

author = "Xingya Feng and Taylor, {P. H.} and S. Dai and S. Day and Adcock, {T. A.A.}",

note = "Funding Information: This work was funded by UK/China ORE funding (EPSRC grant EP/R007632/1) and the United Kingdom Centre for Marine Energy Research (UKCMER) (EPSRSC grant EP/R007632/1). The authors would also like to acknowledge the use of the University of Oxford Advanced Research Computing (ARC) facility in carrying out the numerical work. Feng, Xingya, Taylor, P. H., Dai, S., Day, S., and T. A. A. Adcock. {"}An Approximation Model for Nonlinear Wave Induced Moment on a Vertical Surface-Piercing Column.{"} Paper presented at the The 30th International Ocean and Polar Engineering Conference, Virtual, October 2020; 30th International Ocean and Polar Engineering Conference, ISOPE 2020 ; Conference date: 11-10-2020 Through 16-10-2020",

year = "2020",

month = oct,

day = "11",

language = "English",

series = "Proceedings of the International Offshore and Polar Engineering Conference",

publisher = "International Society of Offshore and Polar Engineers",

pages = "1889--1895",

booktitle = "30th International Ocean and Polar Engineering Conference",

address = "United States",

}

Feng, X, Taylor, PH, Dai, S, Day, S & Adcock, TAA 2020, An approximation model for nonlinear wave induced moment on a vertical surface-piercing column. in 30th International Ocean and Polar Engineering Conference., ISOPE-I-20-3127, Proceedings of the International Offshore and Polar Engineering Conference, vol. 2020-October, International Society of Offshore and Polar Engineers, pp. 1889-1895, 30th International Ocean and Polar Engineering Conference, ISOPE 2020, Virtual, Online, China, 11/10/20. <https://onepetro.org/ISOPEIOPEC/proceedings-abstract/ISOPE20/All-ISOPE20/ISOPE-I-20-3127/446574>

An approximation model for nonlinear wave induced moment on a vertical surface-piercing column. / Feng, Xingya; Taylor, P. H.; Dai, S. et al.
30th International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers, 2020. p. 1889-1895 ISOPE-I-20-3127 (Proceedings of the International Offshore and Polar Engineering Conference; Vol. 2020-October).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution book

TY - GEN

T1 - An approximation model for nonlinear wave induced moment on a vertical surface-piercing column

AU - Feng, Xingya

AU - Taylor, P. H.

AU - Dai, S.

AU - Day, S.

AU - Adcock, T. A.A.

N1 - Funding Information: This work was funded by UK/China ORE funding (EPSRC grant EP/R007632/1) and the United Kingdom Centre for Marine Energy Research (UKCMER) (EPSRSC grant EP/R007632/1). The authors would also like to acknowledge the use of the University of Oxford Advanced Research Computing (ARC) facility in carrying out the numerical work. Feng, Xingya, Taylor, P. H., Dai, S., Day, S., and T. A. A. Adcock. "An Approximation Model for Nonlinear Wave Induced Moment on a Vertical Surface-Piercing Column." Paper presented at the The 30th International Ocean and Polar Engineering Conference, Virtual, October 2020

PY - 2020/10/11

Y1 - 2020/10/11

N2 - This study focuses on the analysis of the higher harmonic wave moments (around the seabed) on a vertical cylinder under the action of focused wave groups. The moment is known to be more nonlinear than the horizontal wave force; however, it is not very much investigated in the literature due to the difficulty of measuring accurately the mudline moment. We analysed the carefully measured wave loads from the tests in the Kelvin tank in the University of Strathclyde where a four-phase method is employed to extract the harmonic wave loads. The mudline moment shows a ‘Stokes-like’ underlying harmonic structure similar to the horizontal force. An approximation model is established to estimate the harmonic moment from the linear moment component. The model requires the nonlinear horizontal force coefficients and the moment arm of each harmonic. The moment arm for each higher harmonic is found from the measured forces and moments. The approximation model is demonstrated to be successful from both the measured data and numerical simulation.

AB - This study focuses on the analysis of the higher harmonic wave moments (around the seabed) on a vertical cylinder under the action of focused wave groups. The moment is known to be more nonlinear than the horizontal wave force; however, it is not very much investigated in the literature due to the difficulty of measuring accurately the mudline moment. We analysed the carefully measured wave loads from the tests in the Kelvin tank in the University of Strathclyde where a four-phase method is employed to extract the harmonic wave loads. The mudline moment shows a ‘Stokes-like’ underlying harmonic structure similar to the horizontal force. An approximation model is established to estimate the harmonic moment from the linear moment component. The model requires the nonlinear horizontal force coefficients and the moment arm of each harmonic. The moment arm for each higher harmonic is found from the measured forces and moments. The approximation model is demonstrated to be successful from both the measured data and numerical simulation.

KW - focused waves

KW - higher harmonics

KW - monopile

KW - nonlinear loads

KW - offshore wind

KW - arctic engineering

KW - structural loads

KW - harmonic structures

UR - http://www.scopus.com/inward/record.url?scp=85090909164&partnerID=8YFLogxK

UR - https://publications.isope.org/proceedings/ISOPE/ISOPE%202020/data/pdfs_Vol3/3127-20TPC-0901.pdf

M3 - Conference contribution book

AN - SCOPUS:85090909164

T3 - Proceedings of the International Offshore and Polar Engineering Conference

SP - 1889

EP - 1895

BT - 30th International Ocean and Polar Engineering Conference

PB - International Society of Offshore and Polar Engineers

T2 - 30th International Ocean and Polar Engineering Conference, ISOPE 2020

Y2 - 11 October 2020 through 16 October 2020

ER -

Feng X, Taylor PH, Dai S, Day S, Adcock TAA. An approximation model for nonlinear wave induced moment on a vertical surface-piercing column. In 30th International Ocean and Polar Engineering Conference. International Society of Offshore and Polar Engineers. 2020. p. 1889-1895. ISOPE-I-20-3127. (Proceedings of the International Offshore and Polar Engineering Conference). Epub 2020 Oct 11.

An approximation model for nonlinear wave induced moment on a vertical surface-piercing column

Abstract

Publication series

Conference

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Kelvin Hydrodynamics Laboratory

Cite this

An approximation model for nonlinear wave induced moment on a vertical surface-piercing column

Abstract

Publication series

Conference

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Equipment

Kelvin Hydrodynamics Laboratory

Cite this