Experimental observation of a near-motion-trapped mode: free motion in heave with negligible radiation

H. A. Wolgamot; P. H. Taylor; Taylor R Eatock; den Bremer TS van; A. C. Raby; C. Whittaker

doi:10.1017/jfm.2015.669

Experimental observation of a near-motion-trapped mode: free motion in heave with negligible radiation

H. A. Wolgamot^*, P. H. Taylor, Taylor R Eatock, den Bremer TS van, A. C. Raby, C. Whittaker

^*Corresponding author for this work

School of Engineering, Computing and Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

A simple geometry that exhibits near motion trapping is tested experimentally, along with perturbed versions of the structure. The motion of the freely floating structure and the surrounding wave field is tracked and the near-motion-trapped mode is found, characterised by a slowly decaying heave motion with very small linear radiation of energy. It is found that the latter property is a better discriminator of the perturbed geometries as viscous damping masks fine differences in radiation damping as far as the motion of the structure is concerned. The magnitude of this viscous damping is reasonably well predicted by a simple Stokes oscillatory boundary layer analysis.

Original language	English
Pages (from-to)	786R 5-1-786 R5-11
Number of pages	0
Journal	Journal of Fluid Mechanics
Volume	786
Issue number	0
DOIs	https://doi.org/10.1017/jfm.2015.669
Publication status	Published - 3 Dec 2015

Access to Document

10.1017/jfm.2015.669

Cite this

@article{36b447da26284437935fea3c21142d4c,

title = "Experimental observation of a near-motion-trapped mode: free motion in heave with negligible radiation",

abstract = "A simple geometry that exhibits near motion trapping is tested experimentally, along with perturbed versions of the structure. The motion of the freely floating structure and the surrounding wave field is tracked and the near-motion-trapped mode is found, characterised by a slowly decaying heave motion with very small linear radiation of energy. It is found that the latter property is a better discriminator of the perturbed geometries as viscous damping masks fine differences in radiation damping as far as the motion of the structure is concerned. The magnitude of this viscous damping is reasonably well predicted by a simple Stokes oscillatory boundary layer analysis.",

author = "Wolgamot, {H. A.} and Taylor, {P. H.} and Eatock, {Taylor R} and van, {den Bremer TS} and Raby, {A. C.} and C. Whittaker",

year = "2015",

month = dec,

day = "3",

doi = "10.1017/jfm.2015.669",

language = "English",

volume = "786",

pages = "786R 5--1--786 R5--11",

journal = "Journal of Fluid Mechanics",

issn = "0022-1120",

publisher = "Cambridge University Press",

number = "0",

}

TY - JOUR

T1 - Experimental observation of a near-motion-trapped mode: free motion in heave with negligible radiation

AU - Wolgamot, H. A.

AU - Taylor, P. H.

AU - Eatock, Taylor R

AU - van, den Bremer TS

AU - Raby, A. C.

AU - Whittaker, C.

PY - 2015/12/3

Y1 - 2015/12/3

N2 - A simple geometry that exhibits near motion trapping is tested experimentally, along with perturbed versions of the structure. The motion of the freely floating structure and the surrounding wave field is tracked and the near-motion-trapped mode is found, characterised by a slowly decaying heave motion with very small linear radiation of energy. It is found that the latter property is a better discriminator of the perturbed geometries as viscous damping masks fine differences in radiation damping as far as the motion of the structure is concerned. The magnitude of this viscous damping is reasonably well predicted by a simple Stokes oscillatory boundary layer analysis.

AB - A simple geometry that exhibits near motion trapping is tested experimentally, along with perturbed versions of the structure. The motion of the freely floating structure and the surrounding wave field is tracked and the near-motion-trapped mode is found, characterised by a slowly decaying heave motion with very small linear radiation of energy. It is found that the latter property is a better discriminator of the perturbed geometries as viscous damping masks fine differences in radiation damping as far as the motion of the structure is concerned. The magnitude of this viscous damping is reasonably well predicted by a simple Stokes oscillatory boundary layer analysis.

U2 - 10.1017/jfm.2015.669

DO - 10.1017/jfm.2015.669

M3 - Article

SN - 0022-1120

VL - 786

SP - 786R 5-1-786 R5-11

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

IS - 0

ER -

Experimental observation of a near-motion-trapped mode: free motion in heave with negligible radiation

Abstract

Access to Document

Fingerprint

Cite this