Wave interaction effects for non-compliant TLP
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The paper investigates the problem of estimating the deck clearance for a TLP under extreme wave conditions. Numerical predictions obtained with a second order diffraction program is compared to experimental results from model tests in an offshore basin. The main focus is put on evaluating higher order wave effects and related topics. The variability and quality of laboratory waves is considered to be particularily relevant, and is discussed in some detail. Wave surface effects are approached at different levels of complexity in order to highlight the more fundamental aspects of non linear wave diffraction: For plane, progressive waves in the absence of the structure, the linear and second order potential solutions are compared to corresponding results obtained from experiments. Wave diffraction effects in periodic waves is investigated for a range of frequencies at designated locations within the confines of the TLP. The relevance of non linear corrections of order higher than two is discussed at some l ength. Extreme value predictions for wave height/deck clearance are obtained from stochastic analysis performed on extensive experimental wave records.
