Task 30 Navigation

Task 30 –

OC4 Phase I:
Jacket support structure

Activity during OC3, Phase III focused on a multi-braced steel support structure, and the participants in OC4 build on those findings. Attention is given to aspects such as the buoyancy calculation and methods of accounting for additional masses (such as hydrodynamic added mass). Also, investigation of local modes and dynamics of a jacket is in the scope of interest.. This work is useful to industry because jackets are increasingly used in and suggested for wind power facilities—e.g., the recently completed wind park “alpha ventus” in the German portion of the North Sea—and for several proposed projects in the United States.

Furthermore, precise model input and boundary conditions are available:

Figure 1 Description of Phase I Jacket Support Structure

A set of load cases of increasing complexity is supplied to participants. The simulation results are consolidated by Fraunhofer IWES and made available for further analysis. Confidentiality is minimal to allow new partners to easily join before and during the project. Participants may compare the design basis and results with their own code after the project is completed. This is ensured by choosing publicly available jacket and turbine designs to be used by all the participants.

Phase I is already completed and its results are published in Proceedings of the 22nd International Ocean and Polar Engineering Conference (ISOPE). The results already obtained within Phase I received the international recognition in the academic and industrial sectors.