A semi-linear method for particle kinematics under steep randomwave crests

Nwaka Chuks Ojieh, Nigel Barltrop

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

Abstract

The determination of random wave kinematics in high sea-states especially in the region above mean water surface has been a major challenge and most proposed methods are not robust. In this work, a method which is similar to stretching and extrapolation in its simplicity is developed based on a simplified form of wave-wave interaction which is robust to 2nd order. To check the usefulness of the new method, horizontal particle velocity results are compared with Zhang's HWM, Wheeler stretching, linear extrapolation above MWL, experimental measurements and theoretical computations of Longridge et al (1996), Skjelbriea et al (1991) and Stansberg et al (2006). Results of the new method show good agreement with the results of Skjelbriea et al (1991) and are closer to experiment than 2nd order results of Stansberg et al (2006) while only showing a qualitative agreement with Longridge et al (1996). The poorer comparison with Longridge et al (1996) is probably because it was not possible to reproduce the exact time series used by Longridge et al as the exact amplitudes and phases were not available. The improved capability of the new method over existing methods has thus been demonstrated and its advantage over the HWM lies in being simpler to implement.

Original languageEnglish
Title of host publication2008 Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008
Pages157-163
Number of pages7
DOIs
Publication statusPublished - 1 Dec 2008
Event27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008 - Estoril, Portugal
Duration: 15 Jun 200820 Jun 2008
Conference number: 27

Publication series

NameProceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
Volume4

Conference

Conference27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008
Abbreviated titleOMAE2008
CountryPortugal
CityEstoril
Period15/06/0820/06/08

Keywords

  • particle kinematics
  • steep random-wave crests

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    Ojieh, N. C., & Barltrop, N. (2008). A semi-linear method for particle kinematics under steep randomwave crests. In 2008 Proceedings of the 27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE 2008 (pp. 157-163). (Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE; Vol. 4). https://doi.org/10.1115/OMAE2008-57240