The influence of steel catenary risers on wave induced motions of a semi submersible

With the increasing number of risers attached to floating oil and gas production platforms, it is necessary to include the influence of risers in the motion analysis of the platform in waves. The motion analysis is required to determine the workability of the unit and the loads on the structure, therefore accurate results are of great importance...

Investigation of Nonlinearities in the Superposition of Ship Motions by 6DOF Forced Oscillations

The Floating Transshipment Container terminal

Compared to land, rail and air, sea transport has proven to have the largest contribution to the transport of goods and is witnessing a continuous growth over the years. The existing ports are dealing with an increasing flow of goods and the transporting vessels, resulting in capacity problems. New innovations and technology are needed to...

Numerical modeling of nonlinear Newwaves for impact assessment on offshore structures

Offshore structures are designed to resist the impact of the extreme wave. Shell EP Projects desires a computer model that is able to simulate the impact of the design wave on gravity based offshore platforms, such as the Sakhalin PA-B platform. Comflow is a numerical model that simulates fluid flow, by solving the Navier-Stokes equations using...

Improved calculation method for the workability during pipe laying: Composition of a standard format

To support cost calculations for tendering a pipe lay project, the influence of weather conditions has to be incorporated by applying workability predictions for the pipe lay vessel. When assuming constant good weather conditions it is possible to accurately determine the duration of an offshore pipe lay project. In practice however, changing...

Wave focussing in a laboratory flume

Amplification of waves by a Concrete Gravity Substructure

Diffraction of both regular and irregular waves by a Concrete Gravity Sub-structure (CGS) was investigated using both experimental surface elevation measurements and computational results of the linear diffraction code DELFRAC. The influence of the box-shaped base that supports the four vertical columns was studied independently from the columns...

Computer simulation of the behaviour of an LNG carrier moored to an open jetty

In the design of oil and gas terminals Six Degree of Freedom (SDF) models are used to calculate the motions of the moored ship as well as forces in mooring lines. TERMSIM II (LNG) is one of those SDF-models, developed by MARIN under a Joint Industry Program with Shell as one of the main sponsors and users. Although the simulation programs have...

Power from ocean waves: A study to power conversion with the Archimedes Wave Swing

The analysis of model measurements concerning the behaviour of moored ships in long waves

When designing a new port it is important to predict the operation efficiency of the port. In this respect, it is desirable to predict the possible downtime of a new port in an early phase of the design process. Downtime depends strongly on the moored ship motions. In the past decades several numerical models were developed to predict the...

The analysis of prototype measurements concerning the behaviour of moored ships in long waves

In the past decades several numerical models were developed to predict the behaviour of moored ships in waves. They are referred to as Six Degrees of Freedom models. These models need quite detailed input data. For the planning phase of a port or an offshore facility, a need has grown for a model which estimates the ship's behaviour and possible...

Buenos Aires port expansion 2020

Economic outlook and capacity of the port The port of Buenos Aires has known a large growth of container throughputs in the last few years: in 1991 233,000 TEU were handled, in 1995638,000 and in 1998 over 1.1 million TEU were handled by the container terminals in Puerto Nuevo and Dock Sud. The end of this growth is not expected soon and various...

Horizontal oscillation tests on a planing model

A number of captive tests were done in the towing tank at Delft University of Technology. These tests have the goal to learn more about the forces and moments on planing ships, to determine the effect of motions as pure yaw, pure sway and the coupling between sway and yaw on planing ships. To determine the influence of draught, pitch, speed,...

The Deep Water Breakwater: An investigation of possibilities

As a result of a number of causes, more and more human activities are shifting to offshore locations, resulting in a fast growing number of offshore structures. Not only the number of (planned) offshore structures increases, but also the diversity of the designs is growing. Nowadays these structures are often situated in deeper water. It is...

The influence of Mooring Lines on the Damping of Low Frequency Motions of Moored Offshore Structures

For years it has been customary, in the prediction the Low Frequency (LF) dynamic behaviour of moored offshore structures, to assume that the mooring system only influences the restoring force characteristics. The contribution of the mooring system to the total system damping was neglected. Research and model tests in recent years have shown...

Zanddiodes voor Delfland: Onderzoek naar de invloed van drijvende Offshore golfbrekers op de Delflandse kust

Onderzoek naar de invloed van drijvende golfbrekers op de kust van Delfland. Om de werking te zien van het zanddiode-principe in te zien, is zowel voor het langstransport als het dwarstransport, een mathematisch model toegepast op de Delflandse kust. Uit de berekeningen van het langstransport kwam naar voren, dat het mogelijk was om het netto...