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Author: search.filters.author.Shaik, S.

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    Numerical Investigations on Different Shapes of Offshore Fish Cages Subjected to Regular Waves
    (Springer Science and Business Media Deutschland GmbH, 2024) Shaik, S.; Thuvanismail, N.; Kumar, P.; Eslavanth, S.K.N.
    The global population is increasing and the demand for seafood is also growing. Since the capture production is becoming unsustainable, aquaculture production has to meet the requirements of sea food demand. The primary production is coming from the nearshore cage system in developing countries. The aquaculture industry is now keen to establish a sophisticated infrastructure in offshore, due to better water quality and higher production capacity. The present study describes about different shapes of offshore cages, such as square, circular, hexagon and octagon subjected to regular waves. The frequency and time domain analysis are carried out for each cage using ANSYS AQWA. The added mass, radiation potential damping and response amplitude operators are studied for free floating conditions. The circular cage obtained highest added mass in both heave and pitch and hexagon cage obtained highest radiation damping. Octagon cage obtained highest RAOs in both frequency domain and time domain analysis and highest mooring line tension. The hexagon cage is better performing in all the wave conditions considered. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Dynamic analysis of a porous wall fencing offshore fish cage subjected to regular waves
    (SAGE Publications Ltd, 2024) Shaik, S.; Thuvanismail, N.; Sai Kiran Naik, E.; Vijaykumar, M.
    Global aquaculture is in exponential trend to fulfil the demand for seafood due to the rise in world population. Most countries have implemented nearshore farming and reached their limits, which impacts water quality parameters. Offshore farming is the alternative option to counteract this nearshore farming issue and balance the aquaculture demand and supply. The present study construes on the numerical study of the porous wall fencing offshore fish cage subjected to regular waves. The numerical analysis is carried out for four cages by varying porous hole diameters from 0.5 to 0.7 m and without porosity. All the cages are placed at the same water depth of 200 m, interacting with a constant wave height of 6m with wave periods ranging from 6.92 to 19.05 s. Both frequency and time domain analysis are conducted to study the variation of hydrodynamic parameters, namely added mass, wave excitation forces, radiational potential damping, motion responses, and mooring line tension. Among all cage configurations, the cage with 0.5 m diameter porous hole fencing performs better for all wave conditions considered. Also, a scaled model of 1:75 was considered in both experimental and numerical studies for the purpose of validation. It is learnt that experimental parameters such as motion responses and mooring line tension are in good agreement. © IMechE 2023.