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Second-order statistics and 'designer' waves for violent free-surface motion around multi-column structures
J R Grice1, P H Taylor2, R Eatock Taylor2
1Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, UK jamesgrice23@gmail.com.
Summary
Extreme wave interactions with structures can double wave crest heights, particularly due to near-trapped modes. A designer incident wave can predict extreme crest elevations for various sea states and return periods.
Area of Science:
- Ocean Engineering
- Fluid Dynamics
- Naval Architecture
Background:
- Understanding extreme wave-structure interactions is crucial for offshore engineering.
- Previous studies often simplify wave conditions or structure complexity.
Purpose of the Study:
- To investigate extreme wave-structure interactions using advanced theoretical methods.
- To quantify the amplification of surface elevation around multi-column structures.
Main Methods:
- Employed second-order diffraction theory for wave analysis.
- Utilized Monte Carlo-type simulations to model severe sea states.
- Analyzed surface elevation statistics around a realistic four-column structure.
Main Results:
- Extreme crest elevations more than double those in the incident wave field were observed.
- Second-order near-trapped modes significantly contribute to increased wave heights.
- A 'designer' incident wave concept was introduced to predict extreme responses.
Conclusions:
- Multi-column structures can dramatically amplify wave crests.
- Second-order effects and near-trapped modes are key drivers of extreme interactions.
- The 'designer' wave approach offers a scalable method for predicting extreme wave responses.
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