Tanker approaching structure in complex wind field


Wind Load modelling JIP underway


MARIN is conducting fundamental


research into wind modelling, aiming to develop a


generic, practical outcome for the industry.


The importance of correct wind modelling is increasing with larger, taller floating struc- tures being developed. This is important for port and terminal design, as well as for the offshore industry. Traditionally, wind tunnel models are used but nowadays, CFD is ad- vancing to complex, large domain problems, also enabling wind research.


A comparison between CFD and wind tunnels, or between wind tunnels, results in significant differences. Therefore, the development of adequate guidelines for the reproducibility of wind tunnel tests and CFD calculations is necessary. This had led to the birth of the Wind Load JIP. The Technical University of Eindhoven, DNW, BMT and MARIN initiated the JIP, they would welcome new participants.


Koos Hoefakker c.m.hoefakker@marin.nl


Reliable wind loads Wind loads on single structures will be considered. Addi- tionally, loads on structures in the 3D wake field are of interest. This JIP aims to define a standard for modelling the Atmospheric Boundary Layer (ABL) to determine the level of detail needed to model structures and to gain insight into scaling effects, as well


as determining loads on structures in 3D wind fields. The JIP aims to better under- stand and predict complex wind loads on floating structures.


The ABL is investigated for complex terrain, including a port or terminal with buildings, a bay surrounded by hilly terrain, rough seas or during offshore operations comprising multiple structures. CFD and wind tunnel tests are examined and a modelling standard for both methods will be developed, enabling a reliable prediction of 3D wind fields. The required level of detail of floating structures, scaling effects and overall accuracy of wind loads is investigated by systematically changing parameters in both wind tunnel and CFD models.


The final challenge for the JIP is to translate the insight gained into a practical engineer- ing tool. Currently, an approach is foreseen based on building blocks for different vessel subdivisions. Level of detail is prescribed by the developed guidelines. A 3D wind field, calculated or measured according to the above-mentioned standards, is applied, resulting in the loads on the structure.


report 13


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