A comprehensive experimental study was conducted to produce benchmark wave
kinematics data for five different regular waves and the maxima of four different irregular
wave trains. Two of the irregular waves generated are in the category of rogue waves. A
series of experiments were conducted in a 2-D wave tank at Texas A&M University to
measure wave velocities and accelerations using LDV and PIV systems. The wave crests
of regular and rogue waves are the focus of this study. With the measured wave velocity
field, the wave accelerations were computed using a centered finite difference scheme.
Both local and convective components of the total accelerations are obtained from
experimental data. Also, the nonlinear wave forces on a truncated slender cylinder are
computed by applying the obtained wave kinematics to the Morison equation. The force
results based on measured wave kinematics are compared with those based on the
kinematics of linear extrapolation, Wheeler stretching, and modified stretching. The
Wheeler stretching method generally underestimates the actual wave kinematics. The
linear extrapolation method is very sensitive to the cutoff frequency of the wave spectrum.
The modified stretching method tends to predict the maximum value of wave kinematics
above the still water level (SWL) well except for the convective acceleration. The magnitude of convective acceleration in the regular waves was negligibly small, whereas
the magnitudes of horizontal and vertical convective accelerations in the rogue wave were
increased rapidly above the SWL.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/4797 |
| Date | 25 April 2007 |
| Creators | Choi, Hae-Jin |
| Contributors | Kim, Moo-Hyun |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | 7766865 bytes, electronic, application/pdf, born digital |
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