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http://dx.doi.org/10.3796/KSFT.2004.40.3.214

Dynamic analysis of a cage affected by the current  

Lee, Mi-Kyung (Pukyong National University)
Lee, Chun-Woo (Pukyong National University)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.40, no.3, 2004 , pp. 214-224 More about this Journal
Abstract
A large cage system for the purpose of fishes farming in the open sea was influenced by various forces from the ocean environment. The deformation of the cage by these forces affects the safety of the cage itself, as well as that of the cultivated creatures. In this research, theoretical model was established to analyzing dynamic movement influenced by current for cage. Also, to increase the accuracy of calculations, the reduction ratio of flow speed acquired using the flume tank experiment. Applying the reduction ratio of flow speed to the numerical calculation, the calculation values were compared with the measured values in the flume tank experiment using cage model. The results were as follows ; 1. When the flow speed of the flume tank is fixed, the decrease of the velocity of flow which is passed the upper panel side is proportion to the increase of porosity ratio of netting. 2. When the porosity ratio is fixed, the increase of the velocity of flow which is passed the upper panel side is proportion to the increase of velocity of flow. 3. When the porosity ratio and the flow speed of the flume tank are fixed, the decrease of the velocity of flow which is passed the upper panel side is proportion to the increase of attack angle. 4. As a result of comparison between the underwater shape by simulation which is applying the reduction ratio of flow speed from the experiment using plane netting and that by model experiment, it was found out that the result of the simulation was very close to that of model gear within ${\pm}$ 5 % error range.
Keywords
numerical method; simulation; cage system; dynamic movement; reduction ratio flow speed;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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