Flow of Numerical Prediction for Seedling Production with Density Function Method

The purpose of this paper is to quantitatively predict the flow in a circular tank for seedling production by numerical calculation. Also this is to provide basic knowledge to fishery science and seed production for engineers. Although there are many factors on the initial depletion, hence the influ...

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Bibliographic Details
Published in2018 OCEANS - MTS/IEEE Kobe Techno-Oceans (OTO) pp. 1 - 5
Main Authors Tsubogo, Koichi, Sumida, Tetsuya
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.05.2018
Subjects
density function method
Density functional theory
early mortality
Mathematical model
Numerical models
Production
rearing tank
Storage tanks
Stress
velocity vector
Visualization
vorticity
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Summary:The purpose of this paper is to quantitatively predict the flow in a circular tank for seedling production by numerical calculation. Also this is to provide basic knowledge to fishery science and seed production for engineers. Although there are many factors on the initial depletion, hence the influence of water flow on initial depletion is pointed out, and the problem is almost untouched. Apparently, during the seedling production, the amount of air (bubbles) that generates water flow is adjusted by experience and intuition, such as sound and visual observation. If there is even a mistake in setting the ventilation, there is a possibility of causing massive death of larvae. Therefore, it is necessary to clarify the relationship between flow rates as basic information. In this paper, numerical prediction of flow in a circular tank for seedling production by density function method is performed. As a result of numerical calculation by the density function method, the solution do not diverge at the flow field of aeration quantity Q=25 mL/min or more, and numerical prediction becomes possible. From this point, the density function method can deal with weak points of the conventional one-pressure two-fluid model. The results of the numerical calculation in this paper are approximately in agreement with the vortex center position which is measured from the visualization experiment and it was confirmed from the vorticity distribution diagram that the strength of the large vortex expands when the aeration volume increases.
DOI:10.1109/OCEANSKOBE.2018.8559234