Oscillatory Forces on Square Cylinder and Cubes

E. D. Christensen*, F. Nielsen, M. Borup

*Corresponding author for this work

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Large scale porous structures are a very common part of coastal and offshore structures such as breakwaters for coastal or harbors protection, and scour protection layers for offshore wind turbine foundations. Much research has been carried out on for instance breakwaters from a statistical point of view. This has led to design formulas. In this paper, we present an approach where the forces on large porous structures were measured directly. The goal was to investigate the variability of the wave forces on different structural elements depending on the spatial position in the protection layer. The study indicated that the elements or stones on the edge of a protection layer experienced the largest force away from the protection layer under the influence to an oscillatory outer flow (i.e. a simplification of wave dynamics). The KC-number ranged from 2 to 12. The results indicated a potentially spreading mechanism and explained instability of the outer positioned stones.
Original languageEnglish
Title of host publicationCoastal Structures 2019
EditorsNils Goseberg, Torsten Schlurmann
Place of PublicationKarlsruhe
PublisherBundesanstalt für Wasserbau
Publication date2019
ISBN (Electronic)978-3-939230-64-9
Publication statusPublished - 2019
EventCoastal Structures 2019 - Hannover, Germany
Duration: 30 Sep 20192 Oct 2019


ConferenceCoastal Structures 2019

Bibliographical note

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  • Oscillatory forces
  • Forces on cubes
  • Porous structures
  • Stone protection layer

Cite this

Christensen, E. D., Nielsen, F., & Borup, M. (2019). Oscillatory Forces on Square Cylinder and Cubes. In N. Goseberg, & T. Schlurmann (Eds.), Coastal Structures 2019 (pp. 851-861). Bundesanstalt für Wasserbau. https://doi.org/10.18451/978-3-939230-64-9_085