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Drifting Rogue Packets

[+] Author Affiliations
Amin Chabchoub

University of Sydney, Sydney, Australia

Norbert Hoffmann

Hamburg University of Technology, Hamburg, Germany

Nail Akhmediev

Australian National University, Canberra, Australia

Takuji Waseda

University of Tokyo, Kashiwa, Japan

Paper No. OMAE2018-77904, pp. V003T02A006; 6 pages
doi:10.1115/OMAE2018-77904
From:
  • ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Structures, Safety, and Reliability
  • Madrid, Spain, June 17–22, 2018
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5122-7
  • Copyright © 2018 by ASME

abstract

Modulation instability (MI) is one possible mechanism to explain the formation of extreme waves in uni-directional and narrow-banded seas. It can be triggered, when side-bands around the main frequency are excited and subsequently follow an exponential growth. In physical domain this dynamics translates to periodic pulsations of wave groups that can reach heights up to three times the initial amplitude of the wave train. It is well-known that these periodic wave groups propagate with approximately half the waves phase speed in deep-water. We report an experimental study on modulationally unstable wave groups that propagate with a velocity that is higher than the group velocity since the modulation frequency is complex. It is shown that when this additional velocity to the wave groups is small a good agreement with exact nonlinear Schrödinger (NLS) models, that describe the nonlinear stage of MI, is reached. Otherwise a significant deviation is observed that could be compensated when increasing accuracy of the water wave modeling beyond NLS.

Copyright © 2018 by ASME

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