The importance of the possible existence of so-called freak waves regarding structural design is discussed. At first the framework for design of offshore structures on the Norwegian continental shelf is presented for the purpose of indicating the annual exceedance probabilities of concern regarding design. The adequacy of the second order random model for the sea surface process is briefly indi...

MultiFEBE integrates multiple finite element and boundary models for solving linear static time harmonic multi-domain interaction problems within the field of computational mechanics. It allows to couple bounded or unbounded two- three-dimensional continuum inviscid fluids, elastic solids poroelastic media with beam shell structural elements. This paper summarizes numerical methods implemented ...

Keywords: KP–BBM-II equations Crank–Nicholson method Finite difference scheme Convergence Stability a b s t r a c t In this paper, the finite difference method is employed to solve Kadomtsev–Petviashvili– Benjamin–Bona–Mahony II (KP–BBM-II) partial differential equations. The time and space variable are discretized by the Crank–Nicholson method and the central-difference scheme, respectively. T...

In this paper prediction of the fatigue reliability of a fixed jacket offshore wind turbine designed for a North Sea site in a water depth of 70 m is performed. The longterm statistical distribution of stress ranges of tubular joints is obtained by combination of time domain simulation for representative sea states. The load histories are normalised to ensure that fatigue design criteria based ...

The levels of non-proportionality in fatigue stress-time series are difficult to determine. Approaches from literature not easy interpret and predicts different for variable constant amplitude stresses. In this paper, an extension the PCA-based method is proposed which stresses transformed into equivalent by scaling stress reversal points. This ensures robust easily interpretable results. compa...