Drag and inertia coefficients of live and surrogate shellfish dropper lines under steady and oscillatory flow

OCEAN ENGINEERING

卷:235

Article

Landmann, Jannis¹  Froehling, Lukas¹  Gieschen, Rebekka²  Buck, Bela H.^3,4  Heasman, Kevin⁵  Scott, Nicholas⁵  Smeaton, Malcolm⁵  Goseberg, Nils^2,6  Hildebrandt, Arndt¹ 

[1] Leibniz Univ Hannover, Ludwig Franzius Inst Hydraul Estuarine & Coastal, Nienburger Str 5, D-30167 Hannover, Germany

[2] Tech Univ Carolo Wilhelmina Braunschweig, Leichtwess Inst Hydraul Engn & Water Resources, Div Hydromech Coastal & Ocean Engn, Beethovenstr 51a, D-38106 Braunschweig, Germany

[3] Helmholtz Zentrum Polar & Meeresforsch, Alfred Wegener Inst, Bussestr 27, D-27570 Bremerhaven, Germany

[4] Univ Appl Sci Bremerhaven, Appl Marine Biol & Aquaculture, Karlstadt 8, D-27568 Bremerhaven, Germany

[5] Cawthron Inst, 98 Halifax St East, Nelson 7010, New Zealand

[6] Joint Res Facil Leibniz Univ Hannover & Tech Univ, Coastal Res Ctr, Hannover, Germany

关键词: Aquaculture engineering;    Bivalves;    Hydrodynamic coefficients;    Drag;    Inertia;    Mussels;    Offshore;   

DOI  :  10.1016/j.oceaneng.2021.109377

来源: Elsevier

【 摘 要 】

Against the background of a drastically increased demand of marine proteins, off-bottom, bivalve aquaculture, provides significant potential for production growth when moved into more energetic marine waters. Hence, research, industry and politics are currently proposing the development of new offshore sites. The highly energetic conditions at these sites present a challenging environment for bivalve aquaculture. In this work, physical experiments of suspended bivalves provide new knowledge on the commonly used design parameters: the drag and inertia coefficients. Live bivalves and manufactured surrogate models at a 1:1 scale were tested in a towing tank as well as under waves. The drag coefficient of live blue mussels was determined to be Cd = 1.6 for Reynolds numbers between 2.3 x 104 and 1.4 x 105. The inertia coefficient obtained from the wave tests was Cm = 2.1 for Keulegan Carpenter numbers KC < 10. In a pursuit to better understand the differences between live mussels and surrogates in laboratory conditions, the analysis revealed that appropriate surrogates can be identified. A method to determine the characteristic diameter of mussel dropper lines is suggested. The results facilitate the future design of aquaculture systems in high-energy environments and allow for an integration into numerical models.

【 授权许可】

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