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

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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

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