AuthorsJ. Grue, J. S. Dokken and L. P. Karstensen
TitleWave analysis of porous geometry with linear resistance law
AfilliationScientific Computing
Project(s)No Simula project
Publication TypeJournal Article
Year of Publication2017
JournalWave analysis of porous geometry with linear resistance law
Date Published10/2017
PublisherHarbin Engineering University
Place Published
Keywordsadded mass, damping, fish cages, mean drift force, wave analysis, wave exciting force

The wave diffraction-radiation problem of a porous geometry of arbitrary shape located in the free surface of a fluid is formulated by a set of integral equations, assuming a linear resistance law at the geometry. The linear forces, the energy relation and the mean horizontal drift force are evaluated for non-porous and porous geometries. A geometry of large porosity has an almost vanishing added mass. The exciting forces are a factor of 5–20 smaller compared to a solid geometry. In the long wave regime, the porous geometry significantly enhances both the damping and the mean drift force, where the latter grows linearly with the wavenumber. The calculated mean drift force on a porous hemisphere and a vertical truncated cylinder, relevant to the construction of fish cages, is compared to available published results.

Citation Key25634