Subjects -> EARTH SCIENCES (Total: 771 journals)
    - EARTH SCIENCES (527 journals)
    - GEOLOGY (94 journals)
    - GEOPHYSICS (33 journals)
    - HYDROLOGY (29 journals)
    - OCEANOGRAPHY (88 journals)

OCEANOGRAPHY (88 journals)

Showing 1 - 79 of 79 Journals sorted by number of followers
Hydrobiology     Open Access   (Followers: 38)
Deep Sea Research Part II: Topical Studies in Oceanography     Hybrid Journal   (Followers: 28)
Limnology and Oceanography     Hybrid Journal   (Followers: 26)
Estuaries and Coasts     Hybrid Journal   (Followers: 25)
Deep Sea Research Part I : Oceanographic Research Papers     Hybrid Journal   (Followers: 23)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 21)
Frontiers in Marine Science     Open Access   (Followers: 20)
New Zealand Journal of Marine and Freshwater Research     Hybrid Journal   (Followers: 19)
Journal of Marine Biology & Oceanography     Hybrid Journal   (Followers: 19)
Progress in Oceanography     Hybrid Journal   (Followers: 18)
Journal of Marine Sciences     Open Access   (Followers: 18)
Coastal Engineering     Hybrid Journal   (Followers: 16)
Advances in Oceanography and Limnology     Open Access   (Followers: 16)
Maritime Studies     Open Access   (Followers: 13)
Journal of Oceanography     Hybrid Journal   (Followers: 12)
Advances in Statistical Climatology, Meteorology and Oceanography     Open Access   (Followers: 10)
Bulletin of Marine Science     Full-text available via subscription   (Followers: 9)
Atmospheric and Oceanic Science Letters     Open Access   (Followers: 9)
Fisheries Oceanography     Hybrid Journal   (Followers: 8)
International Journal of Oceanography     Open Access   (Followers: 8)
Physical Oceanography     Hybrid Journal   (Followers: 6)
Open Journal of Marine Science     Open Access   (Followers: 6)
Limnology and Oceanography: Fluids and Environments     Full-text available via subscription   (Followers: 6)
Journal of Oceanography and Marine Science     Open Access   (Followers: 6)
Oceanography : Open Access     Open Access   (Followers: 6)
Limnology and Oceanography: Methods     Hybrid Journal   (Followers: 6)
Paleoceanography and Paleoclimatology     Full-text available via subscription   (Followers: 5)
Marine Science     Open Access   (Followers: 5)
Journal of Oceanology and Limnology     Hybrid Journal   (Followers: 4)
Journal of Marine Science and Engineering     Open Access   (Followers: 4)
Ocean Yearbook Online     Hybrid Journal   (Followers: 4)
Limnology and Oceanography Letters     Open Access   (Followers: 4)
African Journal of Marine Science     Hybrid Journal   (Followers: 3)
Journal of Marine Science and Application     Hybrid Journal   (Followers: 3)
Oceanology     Hybrid Journal   (Followers: 3)
Journal of Operational Oceanography     Hybrid Journal   (Followers: 3)
Journal of Coastal Development     Open Access   (Followers: 3)
Ciencias Marinas     Open Access   (Followers: 3)
Journal of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 3)
Limnology and Oceanography e-Lectures     Open Access   (Followers: 3)
Development and Applications of Oceanic Engineering     Open Access   (Followers: 2)
Indian Journal of Geo-Marine Sciences     Open Access   (Followers: 2)
Regional Studies in Marine Science     Hybrid Journal   (Followers: 2)
Limnology and Oceanography: Bulletin     Hybrid Journal   (Followers: 2)
Mediterranean Marine Science     Open Access   (Followers: 2)
Annals of Marine Science     Open Access   (Followers: 2)
Annals of Limnology and Oceanography     Open Access   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 1)
Scientia Marina     Open Access   (Followers: 1)
Western Indian Ocean Journal of Marine Science     Open Access   (Followers: 1)
Marine Technology Society Journal     Full-text available via subscription   (Followers: 1)
Journal of Ocean Engineering and Science     Open Access   (Followers: 1)
Ocean Life     Open Access   (Followers: 1)
Acta Aquatica : Aquatic Sciences Journal     Open Access   (Followers: 1)
Journal of Ocean Engineering and Technology     Open Access   (Followers: 1)
Tropical Oceanography     Open Access   (Followers: 1)
Marine Systems & Ocean Technology     Hybrid Journal   (Followers: 1)
Marine Life Science & Technology     Hybrid Journal   (Followers: 1)
Coastal Engineering Proceedings : Proceedings of the International Conference on Coastal Engineering     Open Access   (Followers: 1)
Asian Journal of Fisheries and Aquatic Research     Open Access  
Thalassas : An International Journal of Marine Sciences     Hybrid Journal  
Oceans     Open Access  
Aquatic Research     Open Access  
Jurnal Kelautan Tropis     Open Access  
Depik Jurnal Ilmu-Ilmu Perairan, Pesisir dan Perikanan     Open Access  
Journal of Agricultural and Marine Sciences     Open Access  
Turkish Journal of Maritime and Marine Sciences     Open Access  
Arquivos de Ciências do Mar     Open Access  
Scientific Drilling     Open Access  
Jurnal Kelautan : Indonesian Journal of Marine Science and Technology     Open Access  
Oceanologia     Open Access  
Revista de Gestão Costeira Integrada     Open Access  
Revista Ciencias Marinas y Costeras     Open Access  
Egyptian Journal of Aquatic Research     Open Access  
China Ocean Engineering     Hybrid Journal  
Revista de Biología Marina y Oceanografía     Open Access  
Latin American Journal of Aquatic Research     Open Access  
Acta Oceanologica Sinica     Hybrid Journal  
Similar Journals
Journal Cover
Marine Systems & Ocean Technology
Number of Followers: 1  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1679-396X - ISSN (Online) 2199-4749
Published by Springer-Verlag Homepage  [2468 journals]
  • Robust depth position tracking control of an AUV using $$H_{\infty }$$
           synthesis

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      Abstract: Abstract This paper addresses the tracking control for the diving motion of an autonomous underwater vehicle (AUV). The primary control objective is to effectively track the desired depth position, in the presence of parametric uncertainties, underwater disturbances, and input delays. A third-order linearized model is employed to describe the dynamics of the diving system. This dynamic system comprises an inner pitch control loop and an outer depth control loop, each intended for independent control. In order to achieve this, a cascade control structure is adopted for control synthesis. In this context, \(H_{\infty }\) control law for the inner pitch control loop and a proportional (P) control law for the outer depth control loop are proposed, aiming to attain the specified control objectives. The robustness of the control design accounts for parametric uncertainties within the nominal model, input delays, and external disturbances, such as ocean currents. The closed-loop stability of the proposed controller is verified, and closed-loop performance is evaluated through a series of various simulation studies. To maintain practical relevance, we used the experimentally validated parameters of AUV REMUS 100 in the simulation model. The performance of the proposed control scheme is compared with two benchmark control scheme, namely proportional-derivative plus proportional ( \(PD+P\) ) and \(H_{2}\) control. The comparison considers parametric uncertainties, underwater disturbances, and input delay.
      PubDate: 2024-04-12
       
  • Ocean quadcopters: persistent and autonomous aerial surveillance of large
           maritime areas by quadcopters self-powered by ocean waves

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      Abstract: Abstract In this work consideration is given to the possibility for persistent aerial surveillance of oceans by means of quadcopters capable of taking off and landing on the sea and charging their batteries by the waves from the ocean. Clusters of relatively inexpensive ocean quadcopters equipped with conventional CCD cameras could be scattered over large and abandoned maritime areas to perform continuous and random aerial surveillance of the region. Utilizing a simple physical model, the feasibility of this novel approach for monitoring large maritime areas is assessed. Additional R & D is required in order to explore the possibilities offered by oceans quadcopters
      PubDate: 2024-03-15
       
  • Wells turbine power enhancement by simultaneous and opposite motion of the
           turbine-chamber system

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      Abstract: Abstract In this note, consideration is given to a possible practical strategy by which the power from a Wells turbine in an oscillating water column could be enhanced. In this strategy and contrariwise traditional approaches in which turbine and chamber are at rest, the motion of the turbine and the chamber are both in motion and driven by a common heaving float. However, while the motion of the turbine is in one direction, the motion of the chamber is reversed owing to a lever or pulley system. In this way, from the point of view of the turbine framework the relative velocity of air passing through the Wells turbine may be, idealized, doubled and thus the extractable power output. The strategy could also be used in linear inductance generators in which case by doubling the relative velocity between coil and magnet which taking into account that the electrical power is related to the square of relative velocity the strategy is worthy to be considered.
      PubDate: 2024-03-04
       
  • Linear quadratic regulation for a 10-MW tension leg platform floating
           offshore wind turbine operating under normal and extreme turbulence model
           conditions

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      Abstract: Abstract New concepts of floaters have been developed for multimegawatt wind turbines aiming to reduce the cost of renewable energy generation in deep waters. This paper presents the preliminary design and tuning of a linear quadratic regulator (LQR) for a floating offshore wind turbine (FOWT) constituted of the DTU 10-MW offshore reference wind turbine (RWT) and the CENTEC-TLP tension leg platform (TLP). The goal of the LQR is to improve the performance of the 10-MW CENTEC-TLP FOWT above the rated wind speed using the collective blade pitch actuator within the saturation limits. The LQR design is based on a verified control-oriented FOWT model considering the measurement of surge and pitch floater motions in addition to the rotor speed. Wind and wave disturbances are assumed to be unmeasured. The LQR performance is evaluated for two above-rated operational cases, involving normal and extreme turbulence models combined with relevant sea states. Simulation results show that the designed LQR can yield a reduction of approximately 67% in the rotor speed and power standard deviations compared with a baseline proportional-integral (PI) controller. With the baseline controller, the maximum rotor speed and maximum electrical power are about 15% higher than the rated speed and power, respectively, while this value is reduced to about 6% with the LQR controller. The designed LQR can also yield a TLP pitch reduction of approximately 21%, while keeping the surge amplitude and nacelle axial acceleration below their respective limits.
      PubDate: 2024-02-08
       
  • Iceberg draft prediction using gradient boosting regression algorithm

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      Abstract: The Arctic area is one of the best destinations for the development of oil and gas loading equipment. However, the recent development of oil and gas facilities, including the submarine pipelines and wellheads crossing the Arctic area, has elevated the need for more attention to iceberg draft (under-water height of icebergs) estimation during an ice scouring event. This means if the draft of an iceberg is more than the ocean deepness, the iceberg tip can gouge the ocean floor and collide with the subsea assets; as a result, the operational integrity of the submarine infrastructures is threatened. Hence, the estimation of the iceberg drafts is vital for the oil and gas operators in the Arctic waters. In the present study, the use of the Gradient Boosting Regression (GBR) algorithm was proposed to simulate the iceberg drafts for the first time. Initially, the parameters governing the iceberg drafts were recognized, and nine GBR models were then developed. The premium GBR model along with the most important inputs was known by conducting a sensitivity analysis, e.g., the value of correlation coefficient (R) and Akaike Information Criteria (AIC) for the premium GBR model was obtained at 0.907 and 12.571, while the iceberg length ratio (L⁄H) and iceberg width ratio ( \(W/H\) ) were recognized as the most influential input parameters to predict the iceberg drafts. The best GBR model was compared with Support Vector Regression (SVR) and K-Nearest Neighbors Regression (KNR) algorithms, rather the GBR algorithm had the highest degree of accuracy and correlation as well as the lowest amount of complexity. The error analysis demonstrated that roughly 34% of the iceberg draft predicted by the premium GBR model had an error of less than 10%; however, this value for the SVR and KNR models was almost 19%. Lastly, the performed uncertainty analysis proved that the superior GBR model possessed the narrowest bound of uncertainty, with an overestimated performance in the iceberg draft simulation. Graphical
      PubDate: 2024-01-08
      DOI: 10.1007/s40868-023-00132-7
       
  • A nonlinear optimal control approach for unmanned surface vessels

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      Abstract: Abstract The ability of unmanned surface vessels for performing dexterous maneuvering is important for improving vessels’ safety, reliability and operational capacity. The article proposes a nonlinear optimal control approach for unmanned surface vessels. These vessels exhibit three degrees of freedom while their dynamic model can be formulated in analogy to the one of robotic manipulators. This model undergoes approximate linearization around a temporary operating point that is recomputed at each time-step of the control method. The linearization relies on Taylor series expansion and on the associated Jacobian matrices. For the linearized state-space model of the system a stabilizing optimal (H-infinity) feedback controller is designed. This controller stands for the solution to the nonlinear optimal control problem under model uncertainty and external perturbations. To compute the controller’s feedback gains an algebraic Riccati equation is repetitively solved at each iteration of the control algorithm. The stability properties of the control method are proven through Lyapunov analysis. Finally, to implement state estimation-based control without the need to measure the entire state vector of the vessel, the H-infinity Kalman Filter is used as a robust state estimator. The article’s results can be extended to the case of underactuation, that is when the 3-DOF vessel has no thrusters to enable propulsion along its transversal axis. The solution of the nonlinear optimal control problem for unmanned surface vessels allows for reducing energy consumption by their propulsion and navigation system and thus it permits to improve the vessels’ autonomy and operational capacity.
      PubDate: 2023-12-21
      DOI: 10.1007/s40868-023-00126-5
       
  • Numerical investigation of offshore wind turbine combined with wave energy
           converter

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      Abstract: Abstract The coupled dynamic analysis is performed for three different types of offshore floating platforms combined with a wave energy converter (WEC) mounting a 5-MW NREL (National Renewable Energy Laboratory) wind turbine. The Response Amplitude Operators (RAOs) are analysed for the three concepts of combined wind and wave energy platforms for different wind and wave conditions. The hydrodynamic performance for the three different platforms is conducted considering different load cases. The time domain aero-servo-hydro-elastic tool is used to study the motion responses of the combined system under real operational conditions. The platform’s responses are observed to increase with the increase in the wind speed. In the case of floating hybrid platform, surge responses are minimal for the hybrid spar-tours combination for any load case condition. Minimum surge and sway ensure higher wind power absorption. The study further focuses on the tower base forces and moments to study the impact of wind and waves on the combined floater. Fore-aft shear forces and fore-aft bending moments are higher for the platforms indicating the importance of wind-wave loading. The time domain responses are further used as the transfer function to predict the most probable maximum values of motion amplitude expected to occur during the life-time of the structure which can be used for designing a floating wind turbine (FWT) against overturning in high waves. The long-term models are constructed using various short-term situations expected to occur during the structure’s life-time and weighing them appropriately. The long-term distribution uses North Atlantic wave data, and short-term responses are calculated considering Rayleigh distribution. A brief comparative study of the three combined offshore floaters is performed to understand the structural integrity, power performance and dynamic motions of the floating wind energy platform combined with WECs.
      PubDate: 2023-12-11
      DOI: 10.1007/s40868-023-00127-4
       
  • Stochastic assessment of oil spill trajectory: a case study Paradeep
           Offshore, Odisha

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      Abstract: Abstract The present study aims to identify and forecast the probability of impact due to any oil spill near Paradeep coast, Odisha. Different hypothetical spill cases in different time intervals on the coast generate a probability map for oil spills consequences. A stochastic oil spill modelling approach is followed to understand the potential impacts of the oil spill in and around Paradeep, a busy port on the east coast of India. The study considers oil spills at one location on various dates (15 to be precise) spread over the seasons (summer, rainy, and winter). The 15 scenarios with different environmental conditions throughout the whole year are studied in a stochastic modelling approach. The probabilistic calculation of risk and forecasting of possible consequences of oil spill in the model can be used for oil spill risk assessment of Odisha marine environment. The stochastic modelling results of the scenarios showed that any spill near the Paradeep coast affects a large area of the coast.
      PubDate: 2023-12-01
      DOI: 10.1007/s40868-023-00130-9
       
  • Surrogate models for the stiffened catenaries: applications in subsea pipe
           laying

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      Abstract: Abstract In this paper, the governing nonlinear ODE of the suspended stiffened catenary is reinvestigated. It is shown that strong nonlinearity arises from stiffened catenary length, which should be checked by an iterative numerical solution. The two concepts of stiffened catenary (guessed length) and natural catenary (known length) geometries of the suspended pipe, are compared and critically commented upon. In applying the theory to subsea pipeline installation, it is shown that natural catenary assumption, underestimates the installation stresses, particularly in shallow water and low laying depth. However, the true values of the stresses can be computed via stiffened catenary theory, in which the bending stiffness of the suspended pipe is not ignored. Thereafter, substantial iterative numerical solution of the governing nonlinear differential equation, in each load case is carried out. From these batch simulations, a surrogate expression is developed via optimization techniques. This model provides a correction factor by which, the accurate installation stress can be found. Moreover, the accuracy of results is verified by FEM analysis. It is concluded that for the initial estimation of the stresses, the simple natural catenary assumption, which is currently practiced can be used. However, the results should be corrected by the new surrogate expression, that has been produced in this paper. This can eliminate the underestimation of the installation stresses when a simple computational procedure is used.
      PubDate: 2023-11-29
      DOI: 10.1007/s40868-023-00131-8
       
  • MURA: a Multipurpose Underwater Robotic Arm mounted on Kalypso UUV in
           aquaculture

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      Abstract: Abstract Underwater vehicles utilized in net cages at aquaculture facilities are commonly utilized for the purpose of examining the deterioration of nets and the accumulation of biofouling. The implementation of a robotic system for repairing damages has the potential to decrease the expenses associated with employing divers while reducing the risk of their injury. This study details the development, fabrication, and simulation of a cost-effective subaquatic manipulator, denoted as MURA, which can be seamlessly incorporated into submersible vehicles. The Kalypso unmanned underwater vehicle (UUV) is utilized in this study. MURA exhibits a high degree of modularity, enabling seamless alteration of the end-effector tool. Additionally, its low-cost nature renders it a viable option for integration with any underwater vehicle. Three end-effectors were subjected to testing, one designed for the purpose of disposing fish morts, another intended for removing litters from net cages in fisheries, and a third for repairing net tears. This study outlines the MURA design, including the arm’s fabrication and constituent components. In addition, the modeling of the manipulator is presented accompanied by a water flow simulation of the three manipulators. Ultimately, the experimental findings are analyzed and evaluated. These include the field experiments performed at Kefalonia fisheries, along with the duration to complete each task. For instance, the capture of fish morts typically necessitates approximately 30 s, encompassing the entire process from initial targeting to actual capture. In a similar vein, the procedure of mending tears in a net necessitates an approximate duration of 70 s on average, encompassing the stages of initial identification and subsequent detachment. The suggested design exhibits adaptability and durability while upholding affordability when utilized in aquaculture.
      PubDate: 2023-11-16
      DOI: 10.1007/s40868-023-00129-2
       
  • A model of service-oriented architecture of e-certification system to
           support boat registration and site visit inspection to support maritime
           safety and crew health inspection

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      Abstract: Abstract This article describes the architecture of software services that provide registration of small boat data to build maritime safety. The proposed system architecture which so-called SIMKAPEL aims to support small boat registration for maritime safety. It is developed from a conventional service-oriented architecture (SOA) with an open standard for data interoperability between elements. The goal of this research is to implement and evaluate the proposed architecture to support small boat registration and e-certification. Several parts of the architecture have been implemented as a platform that provides core services and data sources to be used by Ministry of Transportation, Directorate General of Sea Transportation, and other government agencies. Finally, the proposed SIMKAPEL platform with the SOA architecture is evaluated for its benefits to users through the expert opinion survey to measure its efficiency. The analysis results showed that SOA-based SIMKAPEL is feasible to use as a boat e-certification system. Furthermore, experiment results provide three parameters (e.g., maritime safety, namely, cargo/passengers, boat safety facilities, and maritime safety systems) with efficiency values of 42%, 46%, and 42%, respectively. The parameter with the highest efficiency shows a big effect on the level of safety of the boat and passengers. Thus, the parameters that need to be prioritized and need boat owners’ attention are cargo/passenger, boat safety equipment, and maritime safety system.
      PubDate: 2023-09-25
      DOI: 10.1007/s40868-023-00128-3
       
  • Numerical investigation of Edinburgh Duck wave energy converter integrated
           with floating breakwaters

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      Abstract: Abstract Hydrodynamic performance of hybrid floating structures consisting of Edinburgh Duck Wave Energy Converter (ED-WEC) integrated to different shapes of Floating Breakwaters (FBW) namely (i) box-type FBW, (ii) trapezoidal-type FBW, (iii) \(\pi\) -type FBW, (iv) parabolic-type FBW and (v) semi-circular-type FBW are investigated based on small amplitude wave theory. The study is performed on the harvesting of wave energy and increasing the wave power absorption from the scattered and the reflected waves due to the presence of oceanic structures integrated with WEC. The hydrodynamic analysis for the hybrid floating breakwater-WEC system is analysed using Ansys AQWA. The associated diffractions and motions of the hybrid floating breakwater-WEC system are examined. The motion responses and resulting wave forces for the heave motion of ED-WEC with different parameters such as width of ED, draft of ED, distance between ED-WEC and floating breakwater and angle of incident are investigated. Further, the study is carried out for isolated ED-WEC and isolated breakwaters. The study performed will help in developing an efficient and reliable form of device for harnessing maximum wave energy into electricity along with the breakwater having practical application of ED-WEC at the initial stages of design. The study will provide a potential solution of generating power from the wave energy and as a coastal defence structure with the presence of floating breakwaters.
      PubDate: 2023-07-10
      DOI: 10.1007/s40868-023-00125-6
       
  • Constructal Design on full-scale numerical model of a submerged horizontal
           plate-type wave energy converter

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      Abstract: Abstract Considering the growing worldwide energy demand, the available energy in ocean waves is an important resource in the field of renewable energy. In this paper, a numerical assessment of the design of the Submerged Horizontal Plate device in full scale was performed aiming to improve its performance. In this sense, the Constructal Design method was applied to define the constraints, performance parameter and degree of freedom. The two-dimensional numerical wave channel on a model scale performed in previous work was full scaled according to Froude similitude criteria. The hydrodynamic performance and similarity among the results of both model and full scale are analyzed. The degree of freedom relative plate height (X) was performed from 20.00% up to 90.00%. Conservation equations of mass and momentum were solved using Computational Fluid Dynamics software based on the Finite Volume Method, adopting the multiphase model Volume of Fluid. The similarity between model and full scale was achieved with a mean difference of 1.15% among the device efficiency results. The analysis results showed an improvement in device performance of up to 35.61% between the worst and the best-studied geometries. The optimal geometry was achieved at X = 90.00% resulting in a device efficiency of 37.15%.
      PubDate: 2023-05-23
      DOI: 10.1007/s40868-023-00124-7
       
  • CFD optimization of a displacement catamaran’s configuration for
           minimized calm water resistance

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      Abstract: Abstract In this paper, a CFD simulation of the flow about a displacement catamaran model (Delft 372 catamaran model) is carried out over a range of forward speeds by solving the Reynold Average Navier–Stokes equation (RANSE). The Shear-Stress Transport (SST) turbulence model is selected, and the volume of fluid (VOF) method is adopted to capture the free surface flow about the catamaran. Results are validated by comparison with experimental data available in the literature. The aim of this study is to investigate the effect of the separation–length ratio and the non-parallel configuration of the demi-hulls on the total resistance and wave pattern generated by the catamaran over a range of forward speeds. Subsequently, the Response Surface Method for optimization is applied at a particular Froude number and over a selected range of separation–length ratios and non-parallel configurations of the demi-hulls to provide minimum total resistance. Obtained results are satisfactory with a reduction in the total resistance at about 5% as compared to that of the original configuration.
      PubDate: 2023-01-03
      DOI: 10.1007/s40868-022-00123-0
       
  • Oblique wave propagation through composite permeable porous structures

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      Abstract: Abstract In the present study, the porous breakwater system consisting of a porous block and a permeable barrier is analysed to understand the wave dissipation due to the composite porous structure. The linearised wave theory is adopted to analyse the wave interaction with three different configurations of the composite structures including (a) porous structure and fully extended vertical barrier, (b) porous structure and bottom-standing barrier and (c) porous structure and surface-piercing barrier. The eigenfunction expansion method along with orthogonal mode-coupling relation is adopted to determine the wave reflection and transmission characteristics along with wave force on the porous structure and barrier, and surface deflection in incident and transmitted region. The experimental investigation is performed for the composite breakwater system and the results obtained are compared and validated with the numerical results. The composite breakwater system is studied for various parameters such as relative water depth, porosity of structure and barrier, structural thickness to wavelength ratio, water depth to wavelength ratio and gap between the structure and barrier. Further, the comparative study is performed with the results available in the literatures. The proposed study exhibits an informative result for the wave energy attenuation by the composite breakwater system which can be designed and implemented in coastal and harbour regions for achieving the tranquillity.
      PubDate: 2022-12-20
      DOI: 10.1007/s40868-022-00122-1
       
  • Experimental study of an oscillating water column wave energy converter
           based on regular waves

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      Abstract: Abstract Increasingly, marine renewable energies are taking over as one of the most relevant solutions to minimize dependence on fossil fuels. The management and exploitation of such energy requires the optimization of converters that will, later on, ensure the conversion of hydraulic energy into electrical energy; among these converters are the oscillating water column. An OWC is characterized by its simplicity and its effectiveness against turbulent ocean conditions. The performance of OWCs depends strongly on the geometrical parameters of the air chamber such as: chamber walls, width, thickness of the front wall, slope at the bottom of the chamber and size of the opening. In this sense, the manuscript presents a parametric approach to investigate, by experimental tests, the hydrodynamic properties and the performance of oscillating water column wave energy converter (OWC). The effects of some geometrical key parameters of the system are analyzed. The tests are carried out on a small‐size OWC. The work seems to be interesting in view of its experimental aspect. We have realized a prototype of an oscillating water column (OWC) which consists of a box (an air chamber) having the shape of parallelepipeds. The experimental results found by this study showed different optimums of: (a) the distance between the wave generator and the device (2 positions). (b) The depth of water in the hydraulic channel. (c) The immersion depth of the front wall of the chamber. (d) The opening at the bottom of the prototype. The results obtained show that the coupling of the geometrical parameters of the device and the conditions of installation leads to an improvement of the hydrodynamic performances of the OWC. The study also shows that the various optimums found give a considerable increase in the energy output.
      PubDate: 2022-11-11
      DOI: 10.1007/s40868-022-00121-2
       
  • A comprehensive review on exploration and exploitation of offshore
           geothermal energy

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      Abstract: Abstract World’s ocean has abundance of geothermal energy. Exploration and exploitation of the same is in nascent stage. Several exploration sensors like magnetic, optical, chemical, etc., are towed from ships to sea floor for exploration. Several researches are carried out for drilling these explored hot spots. Once the energy is exploited, the same is transferred to power plant located on land. In this paper, three different types of power plants are discussed namely onshore power plant, offshore power plant, and power generation using the thermoelectric method. This paper narrates the current status of offshore geothermal technology which also includes the technology readiness level of this method. The paper also mentions the parameters which are required for designing of offshore geothermal power plants. Along with the technical aspects of offshore geothermal exploration and exploitation, this paper also talks about the environmental impact of these techniques on marine life. Demonstrative case studies from Indonesia and Italy are presented in this paper. The technical and economic study of the case studies are also briefed. The learnings from these countries may be utilized for the exploration and exploitation of offshore geothermal hotspots of India. Through this paper, it will be easy to understand the technical, financial, and environmental aspects of offshore geothermal technology for developing countries in the field of geothermal.
      PubDate: 2022-10-24
      DOI: 10.1007/s40868-022-00120-3
       
  • Two-dimensional modelling of free-surface flows in presence of a spherical
           object using the Modified Volume of Fluid technique

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      Abstract: Abstract In this paper, a two-dimensional numerical simulation of water entry of a spherical object is achieved using the Modified Volume of Fluid (MVOF) technique. Continuity and Navier–Stokes equations along with an equation for tracking the free-surface motion are considered as the governing equations for 2D incompressible fluid flow. The free-surface deformation is modelled via integration of the fast fictitious domain method into the MVOF technique. The computational domain includes everywhere even the spherical object where the governing equations are solved. A rigid motion of the spherical object is generated by applying the linear and angular conservation laws. To exert the no-slip condition on the solid–liquid interface implicitly, the viscosity of the region arranged within the solid object is increased artificially. The numerical results obtained using the MVOF method are compared with those of the experiments in the literature and the conventional Volume of Fluid method. The results show that the effects of the artificial compression term on the free-surface deformation is very dominant for coarse meshes while this factor becomes minor for fine meshes.
      PubDate: 2022-09-29
      DOI: 10.1007/s40868-022-00117-y
       
  • Retraction Note: Numerical and experimental evaluation of cavitation
           flow around axisymmetric cavitators

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      PubDate: 2022-09-28
      DOI: 10.1007/s40868-022-00119-w
       
  • A reduced-order model to predict the natural frequencies of offshore wind
           turbines considering soil–structure interaction

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      Abstract: Abstract Analytical reduced-order models (ROMs) are derived aiming at determining the natural frequencies of offshore wind turbines (OWTs). Case studies based on six wind turbines are developed considering two boundary conditions, namely fixed base (perfectly clamped) and elastic base, representing soil–structure interaction (SSI). For the elastic-base boundary condition, the stiffness of the pile-soil system at the seabed is represented by a set of three springs: \(K_{\rm L}\) (lateral spring), \(K_{\rm R}\) (rocking spring) and \(K_{\rm LR}\) (cross-coupling spring). The novel aspect herein is the presentation of an analytical mathematical model that allows obtaining different natural frequencies and the representation of the vibration modes. This mathematical model tackles the problem without the transformation of the beam of a variable section into a beam of a uniform section with equivalent properties that must be adjusted to each case. The different natural frequencies predicted by the ROMs are compared with those obtained by using higher-order hierarchical models using the Finite Element Method (FEM). In addition, the values of the first natural frequency of all OWTs predicted by ROMs are compared with the measured frequencies. The results show that the derived model accurately predicts the fundamental frequency of existing turbines, with errors below 8.2%. This proposed methodology can be of great interest in the early stages of the design of OWTs, provided the expeditious analysis and good accuracy in estimating natural frequencies. It also presents generality of use, since it does not require any previous definition of equivalent properties.
      PubDate: 2022-08-24
      DOI: 10.1007/s40868-022-00116-z
       
 
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