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Articles 31 - 50 of 50
Full-Text Articles in Ocean Engineering
Experimental And Numerical Analysis Of The Drag Force On Surfboards With Different Shapes, Omar Lahlou
Experimental And Numerical Analysis Of The Drag Force On Surfboards With Different Shapes, Omar Lahlou
Theses and Dissertations
The aim of the present study is to define the hydrodynamic resistance of surfboards with different designs. Decreasing the drag acting on a board helps the surfer to attain higher surfing performances. It helps to attain higher speeds and maneuvering for the surfer. In this thesis, theoretical, experimental and computational approaches are used to explain how the drag changes with different surfboard shapes. Four surfboards with varying shapes were towed at different speeds and the resulting force was recorded. Two computational models were developed using Star CCM and Flowsquare to confirm the experimental results. The drag force on the boards …
Feasibility Study And Hydrodynamics Of Transformable Submersible Hydrofoil Trimaran, Yipeng Pan
Feasibility Study And Hydrodynamics Of Transformable Submersible Hydrofoil Trimaran, Yipeng Pan
Theses and Dissertations
It has been the endeavor of naval architects to design innovative hull forms to address the political, socio-economic climate and sustainability around the world. It is imperative that countries be able to protect their sea lanes and coastal zones from surveillance and infiltration from hostile foreign entities. Hence there is a need to develop radically different hull form, which possess the elusive ability and are capable of high-speed. In order to fulfill the idea, the hypothesis envisioned in this thesis is: the Transformable Submersible Hydrofoil Trimaran (TSHT) as an innovative and ground breaking hull form would address the feasibility of …
Numerical Study On Seakeeping Performance Of Hydrofoil Assisted Submersible Trimaran (Hast), Yuchen Lin
Numerical Study On Seakeeping Performance Of Hydrofoil Assisted Submersible Trimaran (Hast), Yuchen Lin
Theses and Dissertations
The present study focuses on the seakeeping characteristics of Hydrofoil Assisted Submersible Trimaran (HAST). The seakeeping performance is an important part in ship design because it effects the comfort, control, resistance and safety. The motions in wave will reduce the performance of ship which is designed and optimized in calm water. The heave and pitch motions of HAST in calm water and regular waves have been investigated by STAR CCM+, a CFD analysis program. The theory of numerical simulation based on STAR CCM+ has been presented. The basic theory of seakeeping performance studies has been discussed. A series of simulations …
Development, Testing, Analysis, And Efficiency Of A Variable Area Dredge In Combination With A Mobile Ferrate-Based Treatment Facility, Leigh Ann Provost
Development, Testing, Analysis, And Efficiency Of A Variable Area Dredge In Combination With A Mobile Ferrate-Based Treatment Facility, Leigh Ann Provost
Theses and Dissertations
This thesis proposal outlines the development and testing of a mobile slurry treatment trailer coupled with a variable area suction head and further expands on results and procedures shown in Feasibility of Muck Removal in the IRL Watershed and Subsequent Ferrate Treatment to Remove Excess Nutrients. The purpose of this thesis is to evaluate the efficiency and effectiveness of the suction head based on the percent solids maintained during dredging. This thesis also evaluates a scaled design and associated costs for a fully scaled dredging project utilizing the suction head. Additional statistics involving further fitting sediment data to a Weibull …
The Corrosion And Biofouling Characteristics Of Sealed Vs. Perforated Offshore Monopile Interiors: Experiment Design Comparing Corrosion And Environment Inside Steel Pipe, Monica M. Maher
Theses and Dissertations
This research addresses the need to improve on the existing methods for the corrosion control of the monopile interiors used to support wind powered turbines by incorporating a design that also enhances marine habitats and fisheries. Retrofitting monopile interiors with cathodic protection has been attempted on existing windfarms to mitigate corrosion, however, this can cause new problems including water acidification and hydrogen sulfide formation. Such chemistry changes can lead to unique localized corrosion concerns. This study investigated internal corrosion, chemistry and biofouling inside partially submerged hollow steel pipes. Watertight pipes with stagnant water inside were compared to pipes with holes …
Cfd Analysis Of Resistance For Stepless And Stepped Planing Hulls, Bhanu Prakash Valtheru
Cfd Analysis Of Resistance For Stepless And Stepped Planing Hulls, Bhanu Prakash Valtheru
Theses and Dissertations
It is the endeavour of naval architects to design hull forms with the least amount of power consumption. In this respect, Naval Architects have been obsessed with the design of various hull forms optimized for a particular service requiring the lowest amount of fuel consumption keeping in mind effects on the climate change and sustainability. Regardless of the way that a considerable measure of research has been done around this area, there remains a level of uncertainty in the reasonably accurate resistance prediction of stepped hull forms in the early design stage. Model tests and full-scale tests are still the …
Controlled Intake Area Dredging For Fine Sediment Removal To Improve Water Quality In The Indian River Lagoon, Hannah Christine Grisanti
Controlled Intake Area Dredging For Fine Sediment Removal To Improve Water Quality In The Indian River Lagoon, Hannah Christine Grisanti
Theses and Dissertations
This study is an investigation of hydraulic dredging specifically designed to remove muck and other fine sediments from local water systems in Brevard County, Florida. The goal of the project is to improve water quality in the Indian River Lagoon (IRL) and create positive environmental impacts. Dredging is an excavation activity that takes place underwater in shallow seas or freshwater environments to remove material from the bottom surface. Typically, dredging techniques are implemented to keep waterways such as canals, inlets, and harbors navigable for boats and barges. Dredging is also commonly used to move sand from offshore sources to beaches …
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Temporal Transformation Of Barrier Islands A Round Nakdong Estuary, Sukzun Youn
Theses and Dissertations
The Nakdong Estuary system near Busan, South Korea consists of dynamic shorelines characterized by morphological transformations that result from both natural disasters (typhoons and flooding) and construction projects (Nakdong Estuary Dam, gates in the West Nakdong River and Busan New-ports). This study aims to synthesize existing data for tides, waves, bathymetry and meteorological data obtained from a variety of institutions with the objectives of (1) identifying and ranking major factors that influence morphological transformations and (2) determining how these factors influence morphological change over time. These objectives were met by analyzing patterns of flow and sediment transport using Center Point …
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Dynamics Of Asymmetrical Configurations Of Catamaran Hull Forms, Vaibhav Aribenchi
Theses and Dissertations
It is important to understand asymmetrical catamarans motions since it influences the loads which increases stress on structures while causing discomfort to passengers and crew members. Researchers so far have been mainly focused on motions characteristics of the conventional catamaran hull forms. There is scant literature or research work in the public domain on asymmetrical catamaran hull form, with regards to its seakeeping performance. This thesis undertakes a comparative analysis of the motion characteristics between newly developed alternative catamaran hull forms of different asymmetrical configurations. The asymmetrical catamarans developed from the original NPL round bilge catamaran hull forms have a …
Cfd Analysis Of Resistance Characteristics Of High-Speed Displacement Hull Forms Fitted With Hull Vane®, Venkata Karthik Avala
Cfd Analysis Of Resistance Characteristics Of High-Speed Displacement Hull Forms Fitted With Hull Vane®, Venkata Karthik Avala
Theses and Dissertations
Improving the performance and resistance of a high-speed monohull forms has been of interest to Naval Architects for several decades. A considerable amount of research has been carried out in this area by using stern flaps and other appendages. This research thesis investigates the resistance characteristics of high-speed round bilge hull forms fitted with a Hull Vane® in the stern region of the vessel. The Hull Vane® is a fixed foil located below the waterline at the aft of the stern of the vessel. The Hull Vane® reduces the generation of waves at the aft and improves the vessel's motions. …
A Physical And Computational Comparison Of Floating Breakwater Design Efficiencies For Habitat Restoration In The Indian River Lagoon, Abigail Lynn Stehno
A Physical And Computational Comparison Of Floating Breakwater Design Efficiencies For Habitat Restoration In The Indian River Lagoon, Abigail Lynn Stehno
Theses and Dissertations
This study examines the design and implementation of floating breakwaters (FB) in the Indian River Lagoon (IRL) to support and protect living shoreline restoration projects from damaging wave climates. The design significant wave climate of the IRL in a 0.6 m water depth had an incident significant wave height of 0.20 m with a wave period of 1.6 s. Based on previous studies, it has been found that habitat restoration will be successful if the wave height is reduced from 0.20 m to 0.10 m with the use of a FB structure. FB structures attenuate wave energies and are transportable, …
Assessing The Hydrodynamic And Economic Impacts Of Biofouling On The Hull Of Surface Vessels Using Numerical Methods, Letchi Evrard Quentin Anoman
Assessing The Hydrodynamic And Economic Impacts Of Biofouling On The Hull Of Surface Vessels Using Numerical Methods, Letchi Evrard Quentin Anoman
Theses and Dissertations
Marine fouling on the hull of surface vessels is a topic of increasing importance in the maritime field for its environmental and financial impacts. Recent research developments have introduced mathematical models dealing with the frictional resistance associated with fouling, thus enabling to single out their impact on ship hydrodynamics. Herein, two implementations of these models are presented. The first implementation used Computational Fluid Dynamics to assess the additional drag induced by fouling for a specific ship model. With the software STAR CCM+, Reynolds Averaged Navier-Stokes equations have been used to model turbulence, wall laws parameters have been adapted to suit …
Hydrodynamic Resistance Of A Surfboard: An Analytical, Empirical, And Statistical Analysis, Andrew Leonard Kledzik
Hydrodynamic Resistance Of A Surfboard: An Analytical, Empirical, And Statistical Analysis, Andrew Leonard Kledzik
Theses and Dissertations
The objective of the present study defines a drag coefficient for a 9’0” surfboard. The hydrodynamic drag of a surfboard is derived from theory outlining the mathematical foundation used. Analytical solutions provide values for boundary layer thickness, momentum flux width, shear stress, drag force and the drag coefficient. This study also examines maximum velocities attainable from in-situ observations of surfers paddling in a controlled environment. The theoretical predictions are compared with experimental observations of surfboard resistance; while simultaneously validating instrumentation and methods of measurement. A number of problems are highlighted, ranging from mathematical problems on turbulent flow analysis to impacts …
Behavioral Responses Of Sub-Adult Atlantic Sturgeon (Acipenser Oxyrinchus Oxyrinchus) To Electromagnetic And Magnetic Fields Under Laboratory Conditions, Andrew Mcintyre Iii
Behavioral Responses Of Sub-Adult Atlantic Sturgeon (Acipenser Oxyrinchus Oxyrinchus) To Electromagnetic And Magnetic Fields Under Laboratory Conditions, Andrew Mcintyre Iii
Theses and Dissertations
Electromagnetic fields (EMF) produced by high voltage (HV), submarine transmission cables leading from offshore wind energy generation facilities could affect foraging or migratory behaviors of electro-receptive fishes, including endangered Atlantic Sturgeon. However, no published studies have quantitatively evaluated the possible behavioral effects of EMF exposure on sturgeon during residence in coastal waters. This study evaluated behavioral responses by sub-adult Atlantic Sturgeon to electromagnetic and magnetic fields under controlled laboratory conditions. Fabricated EMF generators were used to emulate a range of field EMF conditions that migratory fishes could encounter in proximity to submarine HV sources. Sensor arrays and digital video recorders …
The Design Of An Articulating Five-Headed In-Water Grooming Tool To Maintain Ships Free Of Fouling, Caglar Erdogan
The Design Of An Articulating Five-Headed In-Water Grooming Tool To Maintain Ships Free Of Fouling, Caglar Erdogan
Theses and Dissertations
Biofouling is a major concern to ship owners. Biofouling increases hull roughness, increasing the frictional resistance and fuel consumption while decreasing maximum speed. Finding a way to maintain hulls free from fouling has, therefore, become a research challenge for scientists and engineers. Grooming has been proposed as a novel method for controlling fouling (Tribou and Swain 2010). It refers to the regular proactive light cleaning to maintain the hull free of fouling with minimal impact to ship coatings. The purpose of this thesis is to design, build, and deploy a compliant multiheaded grooming tool which utilized five polypropylene vertically rotating …
Quantification Of Frictional Drag Due To Biofouling On In-Service Ships, John Travis Hunsucker
Quantification Of Frictional Drag Due To Biofouling On In-Service Ships, John Travis Hunsucker
Theses and Dissertations
The purpose of this research was to improve the quantification of frictional drag due to biofouling on in-service ships by advancing the knowledge and methodology used to study the interactions between fouling communities and the surrounding environment. This research examined the influence of hydrodynamic stress on the development and frictional drag of fouling communities that developed on a fouling release coating; investigated the reliability of using ship performance monitoring to detect changes in the hull and propeller condition; and evaluated the feasibility of developing a field deployable instrument capable of measuring the local frictional resistance on a ship hull in …
Resistance Prediction For Asymmetrical Configurations Of High-Speed Catamaran Hull Forms, Srikanth Asapana
Resistance Prediction For Asymmetrical Configurations Of High-Speed Catamaran Hull Forms, Srikanth Asapana
Theses and Dissertations
Predicting the resistance of a high-speed catamaran has been of interest to naval architects for the last three decades. Even though considerable amount of research has been carried out in this area, there remains a degree of uncertainty in the accurate resistance prediction of catamaran hull forms in the early design stage. Researches carried out so far have generally ignored the resistance characteristics of unconventional and unsymmetrical catamaran hull forms. This thesis attempts to undertake a comparative analysis of resistance characteristics between newly developed unconventional catamaran hull forms of different configurations derived from existing conventional NPL series of round bilge …
Impact Of Constructing A Low Crested Weir In Cape Canaveral On Flushing In The Banana River, Atousa Saberi
Impact Of Constructing A Low Crested Weir In Cape Canaveral On Flushing In The Banana River, Atousa Saberi
Theses and Dissertations
The purpose of this study is to determine the extent to which constructing a low crested weir adjacent to Port Canaveral improves ushing in the Banana River. The Banana River is a 50 km long sub-basin of Indian River Lagoon (IRL), located between Cape Canaveral and Merritt Island in Brevard County. Although Port Canaveral locks connect the Banana River to the ocean, the locks remain closed when there are no passing vessels; therefore, it has limited circulation and a long ushing time. Declining water quality can be linked to recent high mortality events of di erent species living in the …
Cfd Investigation Of Resistance Of High-Speed Trimaran Hull Forms, Chang Hwan Son
Cfd Investigation Of Resistance Of High-Speed Trimaran Hull Forms, Chang Hwan Son
Theses and Dissertations
Although catamarans continue to increase in size and application with bigger and better designs than the present generation, trimaran and multi-hull forms for high-speed operation are a recent phenomenon due to speed of turnaround time and payload. To fulfill the stringent requirement for commercial and military transportation, various versions of optimum design are being undertaken recently. In particular, the high-speed ferry industry is presently looking at novel hull forms such as the form of trimarans and pentamarans which are considered in one of the most affordable hull forms for high-speed operation around the world. However, few published articles are in …
Re-Evaluation Of Resistance Prediction For High-Speed Round Bilge Hull Forms, Jae Won
Re-Evaluation Of Resistance Prediction For High-Speed Round Bilge Hull Forms, Jae Won
Theses and Dissertations
Predicting the resistance of a high-speed monohull has been of interest to Naval Architects for several decades. Even though considerable amount of research has been carried out in this area, there remains a degree of uncertainty in the accurate resistance prediction in the early design stage. This research thesis attempts to investigate a method for enhancing the accuracy of resistance prediction methods for high-speed round-bilge monohull form vessels for a wide range of volumetric Froude numbers (Fn). While a number of systematic series are in existence, their data are either not readily available or scattered in various internal reports and …