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 ...

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 ...

Decommissioning activity offshore is expected to increase significantly in the next few years and will include some very large concrete platforms in the northern North Sea. The two studies included in this report examine possible methods of removal and demolition, including complete removal, part-removal to below the water line and leaving the concrete bases in place after removing the topsides...

In the North Sea, an array of wind profiling wind lidars were deployed mainly on offshore platforms. The purpose was to observe free stream winds at hub height. Eight lidars were validated prior to offshore deployment with observations from cup anemometers at 60, 80, 100 and 116 m on an onshore met mast situated in flat terrain. The so-called “NORSEWInD standard” for comparing lidar and mast wi...

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...

Brazil began to explore its seas in the 60’s of XX Century looking for petroleum. This journey Northeast and first oil field produced offshore was Guaricema Field, State Sergipe. During 70’s, Petrobrás found Campos Basin, between States Espírito Santo Rio de Janeiro, that became most important province until discovery Pre-Salt province, Santos Basin. As these fields are producing a long time, m...