Second Order Wave Generation in the OEB II

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TypeTechnical Report
Series titleTechnical Report
SubjectSecond Order wave; shallow water; steepness
AbstractWhen first-order natural waves are reproduced in the laboratory using the first order wave generation technique, the primary waves and their locked bounded waves are generated along with some unwanted free waves. Those free waves are evidently generated and propagate towards the test model and reflect from the boundaries. The free waves, having the same frequency of the bounded wave are reproduced, as the boundary conditions of the wave paddle are not properly satisfied up to second-order. The other two types of free waves are due to the wave paddle displacement and local disturbances. These so-called free waves cause an amplification of low frequency and/or high frequency wave phenomena, such as harbour resonance and oscillations of moored ships and, propagation and breaking of waves on floating or fixed structures that may exert huge hydrodynamic loads. The so-called second order wave generation technique could eliminate these alleged free waves. In this experiment second order wave generation technique is successfully used to reproduce the correct bounded waves along with elimination of the unwanted free waves from the wave profiles. This experiment is implemented by means of compensating free waves imposed on the system by second-order paddle motion. The control signal for this motion has to be introduced along with the primary waves.
Publication date
PublisherNational Research Council Canada. Institute for Ocean Technology
PlaceSt. John's, NL
AffiliationNRC Institute for Ocean Technology; National Research Council Canada
Access conditionUnclassified - Unlimited
Peer reviewedNo
NRC number6426
NPARC number8896075
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Record identifierd69c7faf-0dd9-47d6-ad38-e7f2d45d1a00
Record created2009-04-22
Record modified2016-10-03
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