Browsing by Author "Thuvanismail, N."

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A Review on Nearshore and Offshore Fish Cage Developments in Open Seas
(Springer Science and Business Media Deutschland GmbH, 2024) Shaik, A.S.; Thuvanismail, N.
Despite the fact that cage culture has been in practice for centuries, commercialization has only begun in the last few decades. Farmers are keen to relocate to offshore locations since most nearshore sites are entirely utilized, with limited potential for additional fish production and environmental groups are raising concerns about pollution, conservation, and recreation. The cage culture system classifies into nearshore and offshore farming. In this review, the nearshore cage system investigates on cage materials, classifications, and net shapes. It provides a brief overview of cage deformation, velocity reduction, cage hydrodynamic features, motion responses, mooring line tension of single cage and grid system. The definitions of offshore and the design challenges that must overcome to relocate offshore are discussed. The offshore system analyses distinct designs in open cages depending on submergence depth and closed contaminant tanks under harsh environmental conditions. An assessment is carried out on experimental studies, in-situ tests, and numerical and analytical methods of the cage culture system. The evolution, development, and present scenario of sea cage culture in India are also reviewed. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.
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.
Effect of porous baffle on sloshing dynamics in a barge mounted container subjected to wave excitation
(2017) Thuvanismail, N.; Shah, A.P.; Surahonne, D.J.; Annamalaisamy, S.S.
An experimental investigation was carried out to determine the effect of porous baffle walls on sloshing dynamics of a sloshing tank that is partially filled with liquid and rigidly mounted in a barge. The experimental setup is subjected to beam sea regular wave excitations and hence the barge experiences combined sway heave and roll excitations. An aspect ratio (hs/l, where hs is still water level and l is length of tank) of 0.488 is considered which corresponds to 75% fill condition with respect to tank height. Three porosities of 15%, 20%, and 25% are considered. The barge system was subjected to regular waves of frequency (fw) ranging from 0.45Hz to 1.54Hz. The effectiveness of porous baffles on the dissipation of sloshing energy is studied in comparison with without baffle condition. The effect of wave excitation frequency on the sloshing dynamics has also been analysed and the prominent results are here in reported. � Copyright 2017 ASME.
Effect of porous baffle on sloshing dynamics in a barge mounted container subjected to wave excitation
(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2017) Thuvanismail, N.; Shah, A.P.; Surahonne, D.J.; Sannasiraj, S.S.
An experimental investigation was carried out to determine the effect of porous baffle walls on sloshing dynamics of a sloshing tank that is partially filled with liquid and rigidly mounted in a barge. The experimental setup is subjected to beam sea regular wave excitations and hence the barge experiences combined sway heave and roll excitations. An aspect ratio (hs/l, where hs is still water level and l is length of tank) of 0.488 is considered which corresponds to 75% fill condition with respect to tank height. Three porosities of 15%, 20%, and 25% are considered. The barge system was subjected to regular waves of frequency (fw) ranging from 0.45Hz to 1.54Hz. The effectiveness of porous baffles on the dissipation of sloshing energy is studied in comparison with without baffle condition. The effect of wave excitation frequency on the sloshing dynamics has also been analysed and the prominent results are here in reported. Â© Copyright 2017 ASME.
Effect of porous baffle on sloshing pressure distribution in a barge mounted container subjected to wave excitation
(2017) Thuvanismail, N.; Surahonne, D.J.; Shah, A.P.; Annamalaisamy, S.S.
An experimental study has been carried out to assess the sloshing pressure expected on the tank walls. Three porosities of 15%, 20.2%, 25.2% and baffle wall placed at center of tank is considered. The sloshing tank is fitted into the freely floating barge of model scale 1:43.The barge is kept inside the wave flume in the beam sea conditions. The effects of wave excitation frequencies and on the sloshing pressure variation have been studied in detail and, the salient results are herein reported. � Copyright 2017 ASME.
Effect of porous baffle on sloshing pressure distribution in a barge mounted container subjected to wave excitation
(American Society of Mechanical Engineers (ASME) infocentral@asme.org, 2017) Thuvanismail, N.; Surahonne, D.J.; Shah, A.P.; Sannasiraj, S.S.
An experimental study has been carried out to assess the sloshing pressure expected on the tank walls. Three porosities of 15%, 20.2%, 25.2% and baffle wall placed at center of tank is considered. The sloshing tank is fitted into the freely floating barge of model scale 1:43.The barge is kept inside the wave flume in the beam sea conditions. The effects of wave excitation frequencies and on the sloshing pressure variation have been studied in detail and, the salient results are herein reported. Â© Copyright 2017 ASME.
Numerical Investigation on Different Configurations of Offshore Fish Cages in Submerged Conditions Subjected to Regular Waves
(Editorial Board of Journal of Harbin Engineering, 2023) Shaik, A.S.; Thuvanismail, N.; Vijayakumar, M.; Kumar, P.
The present research work concerns about the hydrodynamic behaviors of the open net offshore fish cages of single, double and 4-cage systems subjected to regular sinusoidal waves. The open net semisubmersible rigid cage is square in shape and analyzed numerically using ANSYS AQWA software. Frequency and time domain analyses are carried out for each case. The hydrodynamic parameters such as added mass, radiation potential damping, motion responses and mooring line tensions are considered as performance indicators to conclude as the best arrangements among three different cages. The single cage and windward side of all cages exhibit identical performance in all hydrodynamic parameters. The leeward side of each cage shows lesser parametric values than the windward side cages. Based on the performance indicators, it is concluded that the grid system containing four cage arrangements provides better performance than three other cage configurations. An experimental model of 1: 75 scale is fabricated and wave flume studies are conducted to validate the present numerical model. The cage is placed at a water depth of 55 cm and subjected to wave heights of 12 cm and 14 cm with wave periods ranging from 0.8 s to 2.2 s with an interval of 0.2 s are considered. The same wave flume boundary conditions are adopted for numerical simulations and results are in good agreement with experimental work results. © 2023, Harbin Engineering University and Springer-Verlag GmbH Germany, part of Springer Nature.
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. Â© The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
Shoreline Changes Around Three Estuarine Harbours on Kerala Coast in India
(Seventh Sense Research Group, 2023) Paravath, K.; Thuvanismail, N.
The shoreline, the land and water boundary is subjected to periodic changes due to different dynamic factors like, bathymetry, wave characteristics, currents, and coastal orientation. Coastline variation leads to erosion and accretion phenomena on the coast. In the present study, the coastal changes around three estuarine harbours along Kerala coast in India are analysed by using numerical method. The impact of harbour constructions on shoreline are assessed from this study. Mike 21 SW and LITPACK modules are used to predict the shoreline changes at these three estuarine harbour sites along Kerala coast. The analyses on coastline oscillations around three estuarine harbours show significant impact of harbour constructions on adjacent coast. © 2023 Seventh Sense Research Group®.