Modelling of Drag Forces on a Closed Flexible Fish Cage

Strand, Ida Marlen; Sørensen, Asgeir J.; Lader, Pål; Volent, Zsolt

doi:10.3182/20130918-4-jp-3022.00014

Cited by 10 publications

(23 citation statements)

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“…Even though the parachute is an open volume, and the CFFC is a closed volume and thereby also dependent on the internal flows and motions of the bag, parallels can be drawn. The drag coefficients found for the cylindrical and cubical bag in Strand et al (2013) and Lader et al (2015) were close to the drag coefficient rage found for parachutes and hemispherical cups (Hoerner, 1958).…”

Section: Introductionsupporting

confidence: 77%

“…For Reynolds numbers below Re ≤ 4 · 10 4 (low velocities), the bag did not appear to deform, but remained the shape as it appeared for only static pressure (Strand et al, 2013). The shape of the bag in still water for pure static pressure were found to be dependent on the load history of the bag (Strand et al, 2014).…”

Section: Introductionmentioning

confidence: 89%

“…The deformation resembled the local deformation pattern given by Rudi and Solaas (1993), only in a larger scale. For Reynolds numbers (Re > 4 · 10 4 ) at filling levels below 90 % the local deformations in the front described by Strand et al (2013), Lader et al (2015 and Rudi and Solaas (1993) could resemble the shape of a regular parachute. Even though the parachute is an open volume, and the CFFC is a closed volume and thereby also dependent on the internal flows and motions of the bag, parallels can be drawn.…”

Section: Introductionmentioning

confidence: 97%

“…However, there might arise situations where the bag is in a condition where it is less than full. Strand et al (2013) and Lader et al (2015) studied experimentally the effect on filling level on the drag force for different geometries. The experiments were conducted in the small towing tank at the US Naval Academy in August 2012.…”

Section: Introductionmentioning

confidence: 99%

“…The experiments were conducted in the small towing tank at the US Naval Academy in August 2012. Strand et al (2013) analysed the results for a cylindrical bag, and Lader et al (2015) compared four different geometries : a cylindrical bag with a cone at the bottom, a cubical bag with a pyramid at the bottom, a conical bag and a pyramidal bag. Velocities in the range 0.021-0.127 m/s were studied, giving Reynolds numbers on the range Re = 1 − 8 · 10 4 .…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of current forces and deformations on a half ellipsoidal closed flexible fish cage

Strand

Sørensen

Volent

et al. 2016

Journal of Fluids and Structures

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Closed Flexible Fish Cages are proposed as a new concept in marine aquaculture, replacing the conventional net cages in order to meet ecological challenges related to fish lice and escapes. It is important to understand the response of the cage exposed to current loads. Then more knowledge about forces and deformations on the Closed Flexible Fish Cage for different filling levels is needed. A scaled model of a Closed Flexible Fish Cage shaped like a half ellipsoid was tested in a towing-tank. Global drag forces and bag deformations were measured for four different filling levels between 70-100 %, and steady current velocities between 0.04 m/s and 0.22 m/s in model scale, corresponding to Reynolds numbers in the range Re = 3 − 17 · 10 4 . Findings from the experiments showed that the drag force increased for decreasing filling levels. This increase was caused by a large deformation of the front of the bag affecting the drag coefficient.

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Section: Introductionsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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