Measurements of Water-Wave Cloaking by an Array of Circular Cylinders

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

An experiment is performed to demonstrate water-wave cloaking of a surface-piercing cylinder by an array of eightsurrounding cylinders. The objective is to confirm cloaking for one wave number (5 rad m−1) and steepness (305%) bymeasuring the second-order mean drift force on the inner cylinder and the far-field surface elevation. The influences ofthe tank walls and viscous forces are explored, and uncertainties in the measured quantities are evaluated. A geometry isselected using a linear potential-flow solver coupled with an optimizer, and an apparatus is built for tank testing. For theconfiguration tested, tank-wall effects are important, but viscous forces and load-cell cross talk effects are small. Eliminationof the measured second-order mean drift force is observed with the addition of the outer cylinders. Experimental waveamplitudes are in agreement with numerical predictions at almost all measurement points.
Original languageEnglish
JournalInternational Journal of Offshore and Polar Engineering
Volume28
Issue number2
Pages (from-to)128-134
ISSN1053-5381
DOIs
Publication statusPublished - 2018

Keywords

  • Water wave
  • Cloaking
  • Mean drift force
  • Diffraction

Cite this

@article{e26b564ee5ff4e8da9013f4a4019f2f0,
title = "Measurements of Water-Wave Cloaking by an Array of Circular Cylinders",
abstract = "An experiment is performed to demonstrate water-wave cloaking of a surface-piercing cylinder by an array of eightsurrounding cylinders. The objective is to confirm cloaking for one wave number (5 rad m−1) and steepness (305{\%}) bymeasuring the second-order mean drift force on the inner cylinder and the far-field surface elevation. The influences ofthe tank walls and viscous forces are explored, and uncertainties in the measured quantities are evaluated. A geometry isselected using a linear potential-flow solver coupled with an optimizer, and an apparatus is built for tank testing. For theconfiguration tested, tank-wall effects are important, but viscous forces and load-cell cross talk effects are small. Eliminationof the measured second-order mean drift force is observed with the addition of the outer cylinders. Experimental waveamplitudes are in agreement with numerical predictions at almost all measurement points.",
keywords = "Water wave, Cloaking, Mean drift force, Diffraction",
author = "Robert Read and Bingham, {Harry B.} and John Newman",
year = "2018",
doi = "10.17736/ijope.2018.jc714",
language = "English",
volume = "28",
pages = "128--134",
journal = "International Journal of Offshore and Polar Engineering",
issn = "1053-5381",
publisher = "International Society of Offshore and Polar Engineers",
number = "2",

}

Measurements of Water-Wave Cloaking by an Array of Circular Cylinders. / Read, Robert; Bingham, Harry B.; Newman, John.

In: International Journal of Offshore and Polar Engineering, Vol. 28, No. 2, 2018, p. 128-134.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Measurements of Water-Wave Cloaking by an Array of Circular Cylinders

AU - Read, Robert

AU - Bingham, Harry B.

AU - Newman, John

PY - 2018

Y1 - 2018

N2 - An experiment is performed to demonstrate water-wave cloaking of a surface-piercing cylinder by an array of eightsurrounding cylinders. The objective is to confirm cloaking for one wave number (5 rad m−1) and steepness (305%) bymeasuring the second-order mean drift force on the inner cylinder and the far-field surface elevation. The influences ofthe tank walls and viscous forces are explored, and uncertainties in the measured quantities are evaluated. A geometry isselected using a linear potential-flow solver coupled with an optimizer, and an apparatus is built for tank testing. For theconfiguration tested, tank-wall effects are important, but viscous forces and load-cell cross talk effects are small. Eliminationof the measured second-order mean drift force is observed with the addition of the outer cylinders. Experimental waveamplitudes are in agreement with numerical predictions at almost all measurement points.

AB - An experiment is performed to demonstrate water-wave cloaking of a surface-piercing cylinder by an array of eightsurrounding cylinders. The objective is to confirm cloaking for one wave number (5 rad m−1) and steepness (305%) bymeasuring the second-order mean drift force on the inner cylinder and the far-field surface elevation. The influences ofthe tank walls and viscous forces are explored, and uncertainties in the measured quantities are evaluated. A geometry isselected using a linear potential-flow solver coupled with an optimizer, and an apparatus is built for tank testing. For theconfiguration tested, tank-wall effects are important, but viscous forces and load-cell cross talk effects are small. Eliminationof the measured second-order mean drift force is observed with the addition of the outer cylinders. Experimental waveamplitudes are in agreement with numerical predictions at almost all measurement points.

KW - Water wave

KW - Cloaking

KW - Mean drift force

KW - Diffraction

U2 - 10.17736/ijope.2018.jc714

DO - 10.17736/ijope.2018.jc714

M3 - Journal article

VL - 28

SP - 128

EP - 134

JO - International Journal of Offshore and Polar Engineering

JF - International Journal of Offshore and Polar Engineering

SN - 1053-5381

IS - 2

ER -