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Green Water on Ship-type Offshore Structures

AuthorsBuchner, B.
Conference/JournalPhD-thesis Delft University of Technology
DateOct 31, 2002
The main objective of this study is to develop methods for the evaluation of green water on ship-type offshore structures based on a clear description of the green water physics.

As concluded in Chapter 1, there is limited insight in the physics of the non-linear and strongly complex green water problem, which resulted in a wide range of assumptions in prediction methods. Therefore, in this chapter these physics are studied for ship-type offshore structures.

Model tests were performed with a model representing a Floating Production Storage and Offloading (FPSO) unit. The weather-vaning character of FPSOs around their rotating turret exposes important equipment and superstructures on the bow to the most critical wave conditions.
Two series of initial model tests were performed:
• Pilot tests with a traditional full bow (Test Series A);
• Comparative tests with a traditional full bow and alternative thin bow (Test Series B).

To describe the main physics of the green water problem at the bow, in these initial model tests only head wave conditions were considered. In later test series also other wave directions are studied.

First the two test series will be described. Then the observations from the model tests will be presented. Finally the green water process will be discussed step by step:
1. Motions and relative wave motions
2. Water flow onto the deck
3. Water behaviour and loading on the deck
4. Green water impact on structures.

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stability, seakeeping and ocean engineeringwaves, impacts and hydrostructuralcfd developmentcfd/simulation/desk studiesmeasurements and controldata sciencetime-domain simulationsrenewablesoil and gasinfrastructuremarine systemslife at seatransport and shippingmodel testingmotionssimulationwavesoffshore engineering