Physical Modelling of Blue Mussel Dropper Lines for the Development of Surrogates and Hydrodynamic Coefficients

authored by

Jannis Landmann, Thorsten Ongsiek, Nils Goseberg, Kevin Heasman, Bela H. Buck, Jens André Paffenholz, Arndt Hildebrandt

Abstract

In this work, laboratory tests with live bivalves as well as the conceptual design of additively manufactured surrogate models are presented. The overall task of this work is to develop a surrogate best fitting to the live mussels tested in accordance to the identified surface descriptor, i.e., the Abbott-Firestone Curve, and to the hydrodynamic behaviour by means of drag and inertia coefficients. To date, very few investigations have focused on loads from currents as well as waves. Therefore, tests with a towing carriage were carried out in a wave flume. A custom-made rack using mounting clamps was built to facilitate carriage-run tests with minimal delays. Blue mussels (Mytilus edulis) extracted from a site in Germany, which were kept in aerated seawater to ensure their survival for the test duration, were used. A set of preliminary results showed drag and inertia coefficients C _D and C _M ranging from 1.16-3.03 and 0.25 to 1.25. To derive geometrical models of the mussel dropper lines, 3-D point clouds were prepared by means of 3-D laser scanning to obtain a realistic surface model. Centered on the 3-D point cloud, a suitable descriptor for the mass distribution over the surface was identified and three 3-D printed surrogates of the blue mussel were developed for further testing. These were evaluated regarding their fit to the original 3-D point cloud of the live blue mussels via the chosen surface descriptor.

Organisation(s)

Ludwig-Franzius-Institute of Hydraulics, Estuarine and Coastal Engineering
Geodetic Institute
Leibniz Research Centre FZ:GEO

External Organisation(s)

Technische Universität Braunschweig
Alfred Wegener Institute (AWI) Helmholtz Centre for Polar and Marine Research
Bremerhaven University of Applied Sciences
Cawthron Institute

Type

Article

Journal

Journal of Marine Science and Engineering

Volume

7

Publication date

03.2019

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Civil and Structural Engineering, Water Science and Technology, Ocean Engineering

Electronic version(s)

https://doi.org/10.3390/jmse7030065 (Access: Open)
https://doi.org/10.15488/10173 (Access: Open)

 

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