... is not a cost-effective solution to reduce the operational downtime. Other solutions to reduce the downtime to acceptable levels are required. This paper shows, for a location with strong currents parallel to the coast but also with a predominant swell at a 45° angle with the coast, how numerical modelling...

... are generated by TurbSim and imported into OrcaFlex. The simulations account for various environmental conditions which include individual and combined wind, waves, and current. Response statistics are summarized to study the impact of individual environmental component on the system responses. Furthermore...

.... The forces found using the industry-standard regular design-wave methodology are compared to forces based on their respective irregular sea states. A new alternative regular-wave method is also proposed and compared to the other approaches. The results show that the current industry-standard method often...

... wind turbine (JOWT) are carried out. There are the remarkable discrepancies between the natural modes of JOWT-SC and JOWT due to the added aquaculture cage. Meanwhile, the remarkably increased hydrodynamic forces on JOWT-SC under wave and current loads are observed. The influence of aquaculture cage...

... Abstract Both in riser design and life extension exercises, analytical models are used to determine loads and load effects. For cyclic load assessments it is known that applied current load is an important modelling factor. In guidelines and codes for riser systems, such as DNV-RP-E104 and DNV...

... An engineering approach to dynamic analysis of an offshore monopile wind turbine is presented in this paper. The wind-wave coupling for shallow water conditions is considered. Different wind, wave and current loads on the wind turbine within the cut-in and cut-off conditions are taken...

... 01 11 2011 In this paper a linear diffraction method is presented which is able to determine accurately and fast the effect of current on motions of, and first- and second-order wave loads on offshore structures. The current flow is modeled by double-body potential flow, thereby...

... 01 11 2011 This paper presents the experimental results obtained by means of model tests, focused on the analysis of the influence of current effects in the dynamic behavior of a semi-submersible. The tests were accomplished with and without current, in order to establish...

...-term probability distribution of the response extreme values with great efficiency. Key Words: offshore structures, response, extreme values, Morison's equation, current, identification technique, finite- memory. 1 INTRODUCTION For an offshore structure, wind, wave and gravitational forces are all...

... of current, the response of an offshore structure exposed to Morison wave loading, can be approximated by the response of an equivalent finite-memory nonlinear system (FMNS). These models can then be used, with great efficiency, to determine the probability distribution of response extreme values...

.... Marine environment ocean wind wave current sea level ice climate change remote sensing wave spectra numerical modeling probabilistic modeling freak or rogue waves met-ocean climate extreme values design condition operational condition uncertainty Proceedings of the 26th International...

... 05 01 2009 The present paper describes the behavior of a vertical riser in waves, currents and which is excited by displacements at the riser top. Fundamental equations for riser behavior are described and the Ferrari&Bearman model [4] is applied to estimate hydrodynamic load...

... 07 10 2008 In the present paper, a brief introduction of the fundamentals of TTR dynamic behavior is provided along with service life estimation utilizing numerical simulations in time domain. The simulation of riser motions due to environmental loads, ocean waves and marine current...

... system dealing with oil and gas production or exporting petroleum production. In the present study, dynamic behavior of a vertical riser with a subsurface buoy near the sea surface is described. Hydrodynamic loads due to currents and waves in the direction of the loads and in the transverse direction due...