Applicability of Nonlinear Wavemaker Theory

Generation of high-quality waves is essential when making numerical or physically model tests. When using a wavemaker theory outside the validity area, spurious waves are generated. In order to investigate the validity of different wave generation methods, new model test results are presented where...

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Bibliographic Details
Published in:Journal of marine science and engineering 2019-01, Vol.7 (1), p.14
Main Authors: Eldrup, Mads Røge, Lykke Andersen, Thomas
Format: Article
Language:English
Subjects:
Energy
Irregular waves
Kinematics
linear waves
Mathematical models
Model testing
Nonlinear waves
Numerical models
Regular waves
Stream functions
Theories
Wave generation
wavemaker applicability
wavemaker theory
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Summary:Generation of high-quality waves is essential when making numerical or physically model tests. When using a wavemaker theory outside the validity area, spurious waves are generated. In order to investigate the validity of different wave generation methods, new model test results are presented where linear and nonlinear wave generation theories are tested on regular and irregular waves. A simple modification to the second-order wavemaker theory is presented, which significantly reduces the generation of spurious waves when used outside its range of applicability. For highly nonlinear regular waves, only the ad-hoc unified wave generation based on stream function wave theory was found acceptable. For irregular waves, similar conclusions are drawn, but the modified second-order wavemaker method is more relevant. This is because the ad-hoc unified generation method for irregular waves requires the wave kinematics to be calculated by a numerical model, which might be quite time-consuming. Finally, a table is presented with the range of applicability for each wavemaker method for regular and irregular waves.
ISSN:2077-1312
2077-1312
DOI:10.3390/jmse7010014