Kinematics measurements of regular, irregular, and rogue waves by PIV/LDV

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Title: Kinematics measurements of regular, irregular, and rogue waves by PIV/LDV
Author: Choi, Hae-Jin
Abstract: 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 .
URI: http : / /hdl .handle .net /1969 .1 /4797
Date: 2007-04-25

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Kinematics measurements of regular, irregular, and rogue waves by PIV/LDV. Available electronically from http : / /hdl .handle .net /1969 .1 /4797 .

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