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Journal articles on the topic 'Of Naval Architecture and Marine Engineering'

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Published: 4 June 2021
Last updated: 18 February 2022

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1

Ray, T., R. P. Gokarn, and O. P. Sha. "Neural network applications in naval architecture and marine engineering." Artificial Intelligence in Engineering 10, no. 3 (August 1996): 213–26. http://dx.doi.org/10.1016/0954-1810(95)00030-5.

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2

Sharma, Bhupendra Kumar. "Comment on "Induced magnetic field with radiating fluid over a porous vertical plate: Analytical study" by Sahin Ahmed [Journal of Naval Architecture and Marine Engineering 7(2010), 83-94]." Journal of Naval Architecture and Marine Engineering 9, no. 1 (June 20, 2012): T1—T2. http://dx.doi.org/10.3329/jname.v9i1.10579.

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3

Altosole, M., and Massimo Figari. "Effective simple methods for numerical modelling of marine engines in ship propulsion control systems design." Journal of Naval Architecture and Marine Engineering 8, no. 2 (December 30, 2011): 129–47. http://dx.doi.org/10.3329/jname.v8i2.7366.

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In the last year, the Department of Naval Architecture and Marine Engineering of Genoa University (now Department of Naval Architecture, Marine Technology and Electrical Engineering) collaborated to the design of the propulsion automation of two different naval vessels; within these projects the authors developed different ship propulsion simulators used to design and test the propulsion control schemes. In these time-domain simulators, each propulsion component is represented by a specific mathematical model, mainly based on algebraic and differential equations. One of the key aspects of the propulsion simulation is the engine dynamics. This problem in principle can be dealt with models based on thermodynamic principles, which are able to represent in detail the behaviour of many variables of interest (engine power and speed, air and gas pressures, temperatures, stresses, etc.). However, thermodynamic models are often characterized by a long computation-time and moreover their development usually requires the knowledge of specific engine information not always available. It is generally preferable to adopt simpler simulation models, for the development of which, very few kinds of information are necessary. In fact, for the rapid prototyping of control schemes, it is generally more important to model the whole plant (in a relatively coarse way) rather than the detailed model of some components. This paper deals with simple mathematical methods, able to represent the engine power or torque only, but they can be suitably applied to many types of marine engines in a straightforward way. The proposed simulation approaches derived from the authors’ experience, gained during their activity in the marine simulation field, and they are particularly suitable for a fast prototyping of the marine propulsion control systems. The validation process of these particular models, regarding a Diesel engine, a marine gas turbine and an electric motor, is illustrated based on the sea trials data and engine manufacturers’ data. Keywords: Dynamic simulation; marine engines performance; gas turbine; propulsion control. doi: http://dx.doi.org/10.3329/jname.v8i2.7366 Journal of Naval Architecture and Marine Engineering 8(2011) 129-147
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4

Lamley, Rachel A. "A Model for an Engineering Education." Marine Technology and SNAME News 33, no. 02 (April 1, 1996): 119–21. http://dx.doi.org/10.5957/mt1.1996.33.2.119.

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College students have the impression that education stops at the door of the classroom. However, in today's technically based society it is difficult for a student to master all the skills required of their profession in the classroom. Valuable experience can be gained outside the classroom through various work study programs. These programs allow students to work on realistic projects rather than on simplified classroom problems. This paper looks at various naval architecture and marine engineering related work study programs and a case example.
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Bunch, Howard M. "Catalogue of Ship Producibility Improvement Concepts." Journal of Ship Production 11, no. 03 (August 1, 1995): 203–7. http://dx.doi.org/10.5957/jsp.1995.11.3.203.

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This catalogue is the product of a multi-year project to organize information relating to the improved producibility of Navy ships. This information is largely of a qualitative nature, and deals with all aspects of ship design and construction. Individual suggestions are presented in the form of very short abstracts. These are organized according to the Navy ship Work Breakdown Structure (WBS) coding system. The catalogue is intended to provide a ready reference of producibility information for the student and naval designer. This report has been prepared under the Memorandum of Understanding to Support Program Development in Naval Architecture and Marine Engineering between the United States Naval Sea Systems Command and the University of Michigan. It has been funded by an Office of Naval Research Grant (Number N00014-90-J-1404).
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Kaklis, P. D. "Editorial: Special issue on: Parametric CAD modeling for Naval Architecture, Ocean & Marine Engineering (NAOME)." Ocean Engineering 223 (March 2021): 108655. http://dx.doi.org/10.1016/j.oceaneng.2021.108655.

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7

INOZU, BAHADIR, and BILAL M. AYYUB. "Reliability, Maintenance and Risk Assessment in Naval Architecture and Marine Engineering Education in the US." European Journal of Engineering Education 24, no. 3 (September 1999): 333–38. http://dx.doi.org/10.1080/03043799908923567.

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8

Ridwan, Mohd, and Eko Yulianto. "KOMPETENSI PROGRAM STUDI DIPLOMA TEKNIK PERKAPALAN DALAM INDUSTRI MARITIM INDONESIA." Gema Teknologi 16, no. 1 (October 23, 2010): 16. http://dx.doi.org/10.14710/gt.v16i1.319.

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Mohd Ridwan, Eko Yulianto, in paper competency of naval architecture diploma program on Indonesian maritime industry explain that Shipbuilding engineering professionals is part of the leading maritime industry is expected to become the motor of development of national maritime fleet in the implementation of cabotage (Impres No.5, 2005), this will reduce foreign exchange spending nearly 99 trillion rupiah per year due to the use of foreign fleets, and the creation of new jobs as a supporter of the maritime industry. So the presence of workers who have competence in the field of shipbuilding (ship building, naval architecture, marine engineering enginerring and maritime transportation) is urgently needed and their capability to compete with other countries that previously controlled the sea as a source of national income should be the Indonesian government's attention. Keywords: Professional shipbuilding techniques, competency
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9

陈, 建平. "Research on Construction Model of Naval Architecture and Marine Engineering Subject Based on Lattice Order Method." Creative Education Studies 05, no. 01 (2017): 53–61. http://dx.doi.org/10.12677/ces.2017.51009.

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10

Parsons, Michael G., and Klaus-Peter Beier. "Microcomputer Software for Computer-Aided Ship Design." Marine Technology and SNAME News 24, no. 03 (July 1, 1987): 246–64. http://dx.doi.org/10.5957/mt1.1987.24.3.246.

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The rapid evolution of the microcomputer has changed the software needs of today's naval architects. The Department of Naval Architecture and Marine Engineering at The University of Michigan has been a leader in the application of computers in ship design education. The computer environment readily available to the department's students has changed dramatically in the past few years with the evolution of the Computer-Aided Marine Design Laboratory within the department and the creation of the Computer Aided Engineering Network (CAEN) within the College of Engineering. The microcomputer facilities available to the students are briefly described. To fully integrate this capability into the department's curriculum, a coordinated suite of computer-aided ship design software has been developed for use on the Macintosh and IBM-PC/XT/AT microcomputers provided for the students. To support the use of this and other software on a wide range of computers, a portable, device-independent computer graphics subprogram package M-PLOT has been developed. The educational philosophy behind this design software and its scope, capabilities, and use in ship design education are described. Examples of the use of selected programs are presented to illustrate these capabilities. Plans for further work are outlined. The effort is well toward the goal of a complete, microcomputer-based ship design software environment.
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11

Nugroho, Wibowo Harso, Nanang J. H. Purnomo1, Ogi Ivano, and S. Handoyo. "Rekayasa Desain dan Analisis Struktur perangkat dasar laut Ocean Bottom Unit (OBU) untuk INA – TEWS." Rekayasa Energi Manufaktur 1, no. 2 (April 11, 2017): 49. http://dx.doi.org/10.21070/r.e.m.v1i2.601.

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This paper briefly describes the design and analysis of the structure of ocean bottom units (OBU) as a pair of surface buoys to detect tsunami early. This engineering work such as any other marine construction is based on naval architecture. The design concept OBU is firstly made then the stability calculation is conducted, finally the structural strength is calculated for load case of hydrostatic and impact as the OBU landed on approximately 2000m of ocean depths.
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12

Renilson, M., J. E. Soholt, and G. Macfarlane. "RECENT DEVELOPMENTS IN OCEAN ENGINEERING EDUCATION." APPEA Journal 41, no. 1 (2001): 783. http://dx.doi.org/10.1071/aj00047.

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Ocean engineering is a broad branch of engineering covering all aspects of engineering associated with the design, construction and operation of fixed and floating structures in the marine environment. It differs from naval architecture which traditionally focusses on ships and related ocean vehicles, and is of relevance to engineers in the offshore oil and gas industry.The Australian Maritime College (AMC) commenced running Australia’s first Bachelor of Engineering (Ocean Engineering) degree in 1997, with the first students graduating in 2000. The program was designed to meet the growing need of the Australian offshore oil and gas industry for graduate engineers skilled in the analysis and design of structures and facilities capable of operating in ever-increasing water depths. It builds on the already successful naval architecture degree offered by AMC, and has the first year completely in common.AMC makes use of its uniquely maritime focus and its wide variety of specialist facilities to produce graduates with a strong hands-on approach to complement their theoretical studies. The program features a unique blend of traditional marine and ocean-related subjects with a thorough grounding in hydrodynamics, wave theories, reservoir engineering, drilling technology, well design, offshore operations, oil and gas production technology and sub-sea engineering. As such, it is believed that the syllabus has a composition that is basically unique in the world.To support this new degree, AMC has commissioned the construction of a new Model Test Basin to complement its existing towing tank. This will have a plan form of 35 x 12 m and will be equipped with multi-directional wavemakers, making it ideal for student use, as well as consulting and staff research.The aim of the program is to produce engineering graduates with a broad theoretical background and a practical approach to problem solving. The ocean engineering graduates from AMC will be exceptionally well equipped to pursue successful careers within the international oil and gas industry.This paper describes briefly the various subjects that are unique to the ocean engineering degree and shows how the subject syllabi come together into a coherent program which will produce systems engineers rather than specialists. The course has just recently received Full Accreditation from The Institution of Engineers, Australia (IEAust).
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13

Cahill, Patrick D., and Howard M. Bunch. "A Comparative Study of U.S. and Foreign Naval Acquisition, Design, and Construction Policy and Practices." Journal of Ship Production 12, no. 03 (August 1, 1996): 178–88. http://dx.doi.org/10.5957/jsp.1996.12.3.178.

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In an effort to reduce the cost of Navy ships without significantly reducing capability, the U.S. Navy has performed a series of ongoing investigations into areas of potential cost reduction. One of these investigations was a literature study done at the University of Michigan Department of Naval Architecture and Marine Engineering to identify and compare acquisition, design and construction practices in a number of different countries. Recommendations for potential cost saving changes to the U.S. Navy system, including reduction of administrative costs, design to cost, and changes in labor policies, were made based on the comparisons. This paper is a modified version of the final report submitted to the Department of the Navy.
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14

Kara, F., and D. Vassalos. "Time Domain Computation of the Wave-Making Resistance of Ships." Journal of Ship Research 49, no. 02 (June 1, 2005): 144–58. http://dx.doi.org/10.5957/jsr.2005.49.2.144.

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The Ship Stability Research Centre, Department of Naval Architecture and Marine Engineering, The Universities of Glasgow and Strathclyde, Scotland, UKA linearized three-dimensional potential flow formulation in time domain is applied to calculate wave-making resistance of ships in calm water. Steady-state perturbation potentials for resistance are obtained as the steady-state limit of the surge radiation impulse response function using the transient free surface source distribution over the body surface. Five different vessels are used to validate the present numerical approximation. The results, including steady-state wave-making resistance, sinkage force, trim moment, and wave profile along the waterline, are compared with other published numerical and experimental results.
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15

Zaraphonities, George, Gregory J. Grigoropoulos, Dimitra P. Damala, and Dimitris Mourkoyannis. "Seakeeping Analysis of two Medium-speed Twin-hull Models." Journal of Ship Production and Design 31, no. 03 (August 1, 2015): 192–200. http://dx.doi.org/10.5957/jspd.2015.31.3.192.

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The use of twin-hull ships for high-speed passenger and car-passenger transportation is widespread, whereas their potential use for high-speed cargo transportation was estimated as limited. The present article discusses the seakeeping performance of two twin-hull models of an innovative medium-speed container ship design. Their hull form was the result of a thorough hydrodynamic optimization performed at the School of Naval Architecture and Marine Engineering of NTUA aiming to minimize the calm water resistance within the EU-funded project "EU-CargoXpress." The seakeeping analysis was performed by applying numerical tools and also by performing a series of experiments in the towing tank of NTUA and MARINTEK. The obtained results are presented and discussed.
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16

Reddy, P. Sreehari, A. S. Nagarajan, and M. Sivaiah. "Hydro Magnetic Elastic Free Convection of a Conducting Elastico-Viscous Liquid Between Heated Vertical Plates." Journal of Naval Architecture and Marine Engineering 5, no. 2 (June 20, 2009): 47–56. http://dx.doi.org/10.3329/jname.v5i2.2694.

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The natural convection flow of a conducting visco-elastic liquid between two heated vertical plates under the influence of a transverse magnetic field has been studied in this paper. Dimensionless equations of the problem have been solved by the method of successive approximation. Numerical solutions for velocity and temperature have been obtained. The results obtained are discussed with the help of graphs. The effect of magnetic parameter M, Visco-elastic parameter RC and the product of Prandtl and Eckert numbers [PE] on velocity and temperature fields are investigatedKey words: Visco-elastic liquid, viscous dissipation, vertical plates, convection, successive approximation.DOI: 10.3329/jname.v5i2.2694Journal of Naval Architecture and Marine Engineering 5(2)(2008) 47-56
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17

Gomatam, Sreekar, S. Vengadesan, and S. K. Bhattacharyya. "Numerical simulations of flow past an autonomous underwater vehicle at various drift angles." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 24, 2012): 135–52. http://dx.doi.org/10.3329/jname.v9i2.12567.

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Three dimensional (3D) flow past an Autonomous Underwater Vehicle (AUV) is simulated using a Computational Fluid Dynamics (CFD) approach at a Reynolds (Re) number of 2.09x106. A non-linear k-? (NLKE) turbulence model is used for solving the Reynolds Averaged Navier-Stokes (RANS) equations. The effect of control surfaces over the flow, the flow interaction between the hull and the appendages at various Angles of Attack (AoA) and the effect of the symmetry plane is studied. Flow structure, variation of flow variables and force distribution for various AoA are presented and discussed in detail.DOI: http://dx.doi.org/10.3329/jname.v9i2.12567 Journal of Naval Architecture and Marine Engineering 9(2012) 135-152
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18

Gorla, Rama Subba Reddy, Ali J. Chamkha, and Eisa Al-Meshaiei. "Melting heat transfer in a nanofluid boundary layer on a stretching circular cylinder." Journal of Naval Architecture and Marine Engineering 9, no. 1 (June 16, 2012): 1–10. http://dx.doi.org/10.3329/jname.v9i1.7416.

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A boundary layer analysis is presented for the warm, laminar nanoliquid fluid flow to a melting cylindrical surface moving parallel to a uniform stream. The resulting system of non-linear ordinary differential equations is solved numerically using Runge-Kutta method with shooting techniques. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the friction factor, local Nusselt number and local Sherwood number for several values of the parameters, namely, the Reynolds number, Prandtl number and nanofluid parameters. The obtained results are presented graphicallyand in tabular form and the physical aspects of the problem are discussed.DOI: http://dx.doi.org/10.3329/jname.v9i1.7416 Journal of Naval Architecture and Marine Engineering 9(2012) 1-10
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19

Zakaria, N. M. Golam, Mir Tareque Ali, and Kh Akhter Hossain. "Underlying problems of ship recycling industries in Bangladesh and way forward." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 19, 2012): 91–102. http://dx.doi.org/10.3329/jname.v9i2.10515.

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Ship recycling in Bangladesh has been playing as a catalyst for the economy by supporting steel industry, shipbuilding industry and other industries and it has also been generating huge employments for the country. But, existing problems of this industry in terms of safety, health and environmental issues bring negative image for the country sometimes. This paper is aimed to identify the underlying problems of ship recycling industry and then analyze the nature of the problems to make it helpful overcoming the obstacles. A brief overview about strength, weakness, opportunity and threat of the industries in global perspective has been also discussed.DOI: http://dx.doi.org/10.3329/jname.v9i2.10515 Journal of Naval Architecture and Marine Engineering 9(2012) 91-102
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20

Rahman, M. M., and M. A. Alim. "Numerical study of magnetohydrodynamic free convective heat transfer flow along a vertical flat plate with temperature dependent thermal conductivity." Journal of Naval Architecture and Marine Engineering 6, no. 1 (March 28, 2010): 16–29. http://dx.doi.org/10.3329/jname.v6i1.2654.

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The present numerical work describes the effect of the magnetohydrodynamic (MHD) free convective heat transfer flow along a vertical flat plate with temperature dependent thermal conductivity and heat conduction. The governing equations reduce to local non-similarity boundary layer equations using suitable transformation have been integrated by employing an implicit finite difference method together with the Keller box technique. Comparison with previously published work is performed and excellent agreement is observed. Profiles of the dimensionless velocity and temperature distributions as well as the local skin friction coefficient and surface temperature distribution are shown graphically for various values of the magnetic parameter M, thermal conductivity variation parameter g and Prandtl number Pr.Keywords: Implicit finite difference method, free convection flow, vertical flow, vertical flat plate, temperature dependent thermal conductivityDOI: 10.3329/jname.v6i1.2654Journal of Naval Architecture and Marine Engineering Vol.6(1) 2009 16-29
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21

Gorla, Rama S. R., Ali J. Chamkha, and Abdulkareem Aloraier. "Melting heat transfer in a nanofluid flow past a permeable continuous moving surface." Journal of Naval Architecture and Marine Engineering 8, no. 2 (July 14, 2011): 83–92. http://dx.doi.org/10.3329/jname.v8i2.6830.

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A boundary layer analysis is presented for the warm, laminar nanoliquid flow to a melting surface moving parallel to a uniform free stream. The resulting system of non-linear ordinary differential equations is solved numerically using Runge-Kutta method with shooting techniques. Numerical results are obtained for the velocity, temperature and concentration distributions, as well as the friction factor, local Nusselt number and local Sherwood number for several values of the parameters, namely the velocity ratio parameter, melting parameter and nanofluid parameters. The obtained results are presented graphically and in tabular form and the physical aspects of the problem are discussed.Keywords: Suction/injection; moving surface; nanofluid; boundary layer; shooting technique. doi: http://dx.doi.org/10.3329/jname.v8i2.6830 Journal of Naval Architecture and Marine Engineering 8(2011) 83-92
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22

Kumar, Rushi, and K. Gangadhar. "Heat generation effects on MHD boundary layer flow of a moving vertical plate with suction." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 26, 2012): 153–62. http://dx.doi.org/10.3329/jname.v9i2.8550.

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This work is focused on the numerical solution of a two-dimensional, steady, incompressible electrically conducting, laminar free convection boundary layer flow of a continuously moving vertical porous plate in the presence of a transverse magnetic field and heat generation. The basic equations governing the flow are in the form of partial differential equations and have been reduced to a set of non-linear ordinary differential equations by applying suitable similarity transformations. The problem is solved numerically using shooting techniques with the forth order Runge-Kutta method. The physical behavior of different parameters for velocity, temperature and concentration has been examined graphically and analyzed quantitatively.DOI: http://dx.doi.org/10.3329/jname.v9i2.8550 Journal of Naval Architecture and Marine Engineering 9(2012) 153-167
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23

Islam, A. K. M. Safiqul, M. A. Alim, M. M. A. Sarker, and A. F. M. Khodadad Khan. "Effects of temperature dependent thermal conductivity on natural convection flow along a vertical flat plate with heat generation." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 20, 2012): 113–22. http://dx.doi.org/10.3329/jname.v9i2.9025.

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The effects of temperature dependent thermal conductivity on natural convection flow of an electrically conducting fluid along a vertical flat plate with heat generation have been investigated in this paper. The governing equations with associated boundary conditions for this phenomenon are converted to dimensionless forms using a suitable transformation. The transformed non-linear equations are then solved using the implicit finite difference method. Numerical results of the velocity and temperature profiles, skin friction coefficient and surface temperature profiles for different values of the thermal conductivity variation parameter, Prandtl number and heat generation parameters are presented graphically. Detailed discussion is given for the effects of the aforementioned parameters.DOI: http://dx.doi.org/10.3329/jname.v9i2.9025 Journal of Naval Architecture and Marine Engineering 9(2012) 113-122
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24

Patel, M. H. "On the Hydrodynamics of Tandem-Hull Marine Vehicles." Journal of Ship Research 30, no. 04 (December 1, 1986): 275–86. http://dx.doi.org/10.5957/jsr.1986.30.4.275.

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The development of ship-shape marine vehicles in naval architecture and semisubmersibles in offshore engineering has proceeded along separate lines with each type of vessel being used for quite different operational needs. A tandem-hull marine vehicle offers a design that bridges the gap in between with a hydrodynamic performance that includes the desirable characteristics of both ships and semisubmersibles for floating oil production applications. A tandem-hull vessel consists of a fully submerged hull positioned a small distance below a surface-piercing hull with interhull bracing connections between the two. However, there are a number of unifying considerations which suggest that all three types of vessels can be regarded as part of a wider family of hull shapes. This paper presents a survey of floating vessel designs to illustrate this point and to highlight the position of a tandem hull as being a design midway between ship and semisubmersible. Leading particulars of the surveyed vessels are manipulated into nondimensional ratios and plotted to show their relationship with each other. The paper also presents a simplified hydrodynamic analysis for heave motion of a tandem hull to highlight the main features underlying its hydrodynamic behavior. The tandem-hull design is also analyzed in detail by a more exact diffraction theory based analysis for wave-induced motions and interhull forces. These predicted motions and forces are compared with data from 1: 75 scale model tests. The analyses and model tests are used to illustrate the principal features that govern hydrodynamic behavior of tandem-hull marine vehicles and that lead to some of their operational advantages as floating oil production vessels.
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De, Abhijit, and Ashish Kumar. ""Opti-Marine-Ware" (Optimization of Vessel's Parameters through Spreadsheet Model)." Journal of Naval Architecture and Marine Engineering 3, no. 2 (June 13, 2009): 49–58. http://dx.doi.org/10.3329/jname.v3i2.919.

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[THIS PAPER IS PLAGIARIZED FROM 'Artana, K. B. and Ishida, K.(2003): The Determination of Optimum Ship’s Design and Power Prediction Using Spreadsheet Model, Journal of the JIME, Vol. 37, No. 6', http://www.mesj.or.jp/mesj_e/english/pub/ap_papers/pdf/2003AP7.pdf]The objective of this paper is to describe and evaluate a scheme of engineering-economic analysis for determining optimum ship's main dimensions and power requirement at basic design stage. We have divided the optimization problem into five main parts, namely, Input, Equation, Constraint, Output and Objective Function. The constraints, which are the considerations to be fulfilled, become the director of this process and a minimum and a maximum value are set on each constraint so as to give the working area of the optimization. The outputs (decision variables) are optimized in favor of minimizing the objective function. Microsoft Excel-Premium Solver Platform (a spreadsheet modeling tool is utilized to model the optimization problem). This paper is commenced by the description of the general optimization problems, and is followed by the model construction of the optimization. A case study on the determination of ship's main dimensions and its power requirement is performed with the main objective to minimize the Economic Cost of Transport (ECT). After simulating the model and verifying the results, it is observed that the spreadsheet model yields considerably comparable results with the main dimensions and power requirement data of the real operated ships (tanker). It is also experienced that this kind of optimization process needs no exhaustive efforts in producing programming codes, if the problem and the optimization model have been well defined.Keywords: Optimization; design; Ship power requirementDOI: 10.3329/jname.v3i2.919Journal of Naval Architecture and Marine Engineering 3(2006) 49-58
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Reddy, M. M. Gnaneswara, and N. Bhaskar Reddy. "Thermal radiation and mass transfer effects on MHD free convection flow past a vertical cylinder with variable surface temperature and concentration." Journal of Naval Architecture and Marine Engineering 6, no. 1 (March 27, 2010): 1–15. http://dx.doi.org/10.3329/jname.v6i1.2615.

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The interaction of free convection with thermal radiation of a viscous incompressible unsteady MHD flow past a vertical cylinder with variable surface temperature and concentration is analyzed. The fluid is a gray, absorbing-emitting but non-scattering medium and the Rosseland approximation is used to describe the radiative heat flux in the energy equation. The governing equations are solved using an implicit finite-difference scheme of Crank-Nicolson type. Numerical results for the transient velocity, the temperature, the concentration, the local as well as average skin-friction, the rate of heat and mass transfer are shown graphically. It is observed that the presence of as well as increase in the magnetic field leads to decrease in the velocity field and rise in the thermal boundary thickness. The numerical predications have been compared with the existing information in the literature and good agreement is obtained.Keywords: Heat Transfer, radiation, finite-difference Scheme, vertical cylinderDOI: 10.3329/jname.v5i2.2615Journal of Naval Architecture and Marine Engineering 6(1)(2009) 1-24
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Tu, Wanli, Hong Xu, Yiqun Xu, Qiubo Ye, and Mingxian Shen. "Research on 2.4 GHz Wireless Channel Propagation Characteristics in a Steel Ship Cabin." International Journal of Antennas and Propagation 2021 (January 19, 2021): 1–12. http://dx.doi.org/10.1155/2021/6623638.

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Wireless sensor network (WSN) has become a popular technology and has a good potential application in naval architecture and marine engineering field. Analysis of transmission ability of wireless signal in steel ship environment is important for network deployment including base station and node installation, which would directly impact network performance and has become a hot research field. This paper investigates 2.4 GHz frequency wireless signal propagation characteristics in the steel ship cabin. A 3D ray-tracing model of 2.4 GHz wave propagation in the ship cabin is established, a multipath propagation prediction is carried on, and receiving power is calculated. Besides, the experimental test is performed in the real ship. The simulated and experimental results are processed and compared; the influence law of large obstacles on the signal is discussed, and the guidance scheme for node and base station deployment of the wireless sensor network is proposed. The results show that this analysis could provide valid interpretation of wireless channel propagation characteristics in steel ships.
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Islam, Md Shahidul. "Improving the quality of hexahedral mesh generated by automatic mesh generators." Journal of Naval Architecture and Marine Engineering 8, no. 2 (December 30, 2011): 121–28. http://dx.doi.org/10.3329/jname.v8i2.5646.

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Automatic hexahedral mesh generation is a very deserving solution for better performance of finite element analysis of complex large structures. At present plastering, whisker weaving and whisker weaving based plastering algorithm are available to perform such tasks. As these hexahedral mesh generation processes are fully automatic, it is possible to form some elements, which don’t have high enough qualities for finite element analysis. For this reason, a reliable post-processing method is presented in this paper which can modify the shapes of the already generated hexahedrons. Four different structural models are tested and the results show that the proposed method can effectively modify the quality of the inverted hexahedrons and eliminate the invalid ones.Keywords: Doublet; triplet; quadruplet; Whisker weaving based plastering algorithm; hexahedral meshDOI: http://dx.doi.org/10.3329/jname.v8i2.5646Journal of Naval Architecture and Marine Engineering 8(2011) 121-128
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Suneetha, S., N. Bhaskar Reddy, and V. Ramachandra Prasad. "Thermal Radiation Effects on MHD Free Convection Flow Past an Impulsively Started Vertical Plate with Variable Surface Temperature and Concentration." Journal of Naval Architecture and Marine Engineering 5, no. 2 (June 20, 2009): 57–70. http://dx.doi.org/10.3329/jname.v5i2.2695.

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Thermal radiation effects on hydromagnetic free convection flow past an impulsively started vertical plate with variable surface temperature and concentration is analyzed, by taking into account the heat due to viscous dissipation. The governing boundary layer equations of the flow field are solved by an implicit finite difference method of Crank-Nicholson type. A parametric study is performed to illustrate the influence of radiation parameter, magnetic parameter, Grashof number, Prandtl number, Eckert number on the velocity, temperature and concentration profiles. Also, the local and average skin-friction coefficient, Nusselt number and Sherwood number are presented graphically. The numerical results reveal that an increase in thermal radiation reduces both the velocity and temperature in the boundary layer and a rise in viscous dissipation accelerates the flow. Key words: Thermal radiation, MHD, viscous dissipation, vertical plate. DOI: 10.3329/jname.v5i2.2694 Journal of Naval Architecture and Marine Engineering 5(2)(2008) 57-70
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Alam, Mahmud Md, M. Delower Hossain, and M. Arif Hossain. "Viscous dissipation and Joule heating effects on steady MHD combined heat and mass transfer flow through a porous medium in a rotating system." Journal of Naval Architecture and Marine Engineering 8, no. 2 (December 29, 2011): 105–20. http://dx.doi.org/10.3329/jname.v8i2.5055.

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Viscous dissipation and Joule heating effects on steady MHD combined heat and mass transfer flow through a porous medium along a semi-infinite vertical porous plate in a rotating system has been studied numerically. The boundary layer equations have been transformed into dimensionless coupled nonlinear ordinary differential equations by appropriate transformations. The similarity solutions of the transformed dimensionless equations for the flow field and heat and mass transfer characteristics are obtained by shooting iteration technique. Numerical results are presented in the form of primary and secondary velocities, temperature and concentration distributions within the boundary layer for different parameters entering into the analysis. Finally, the effects of the pertinent parameters on the Skin-friction coefficients, Nusselt number and Sherwood number are also examined.Keywords: MHD; Joule heating; porous medium; rotating system simulation. doi: http://dx.doi.org/10.3329/jname.v8i2.5055 Journal of Naval Architecture and Marine Engineering 8(2011) 105-120
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31

Katalinić, Marko, and Joško Parunov. "Uncertainties of Estimating Extreme Significant Wave Height for Engineering Applications Depending on the Approach and Fitting Technique—Adriatic Sea Case Study." Journal of Marine Science and Engineering 8, no. 4 (April 6, 2020): 259. http://dx.doi.org/10.3390/jmse8040259.

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Studies on the extrapolation of extreme significant wave height, based on long-term databases, are extensively covered in literature. An engineer, working in the field of naval architecture, marine engineering, or maritime operation planning, when tackling the problem of extreme wave prediction, would typically follow relevant codes and standards. Currently, authorities in the field of offshore operation within its guidelines propose several methods: the initial-distribution, extreme value, and peak-over threshold approaches. Furthermore, for each proposed method, different mathematical fitting techniques are applicable to optimize the candidate distribution parameters: the least-square method, the method of moments, and the maximum likelihood method. A comprehensive analysis was done to determine the difference in the results depending on the choice of method and fitting technique. All combinations were tested on a long-term database for a location in the Adriatic Sea. The variability of the results and trends of extreme wave height estimates for long return periods are presented, and the limitations of certain methods and techniques are noted.
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32

Nasrin, R., and M. A. Alim. "Combined effects of viscous dissipation and temperature dependent thermal conductivity on MHD free convection flow with conduction and joule heating along a vertical flat plate." Journal of Naval Architecture and Marine Engineering 6, no. 1 (March 31, 2010): 30–40. http://dx.doi.org/10.3329/jname.v6i1.2648.

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Combined effects of viscous dissipation and temperature dependent thermal conductivity on MHD free convection flow with heat conduction and Joule heating along a vertical flat plate have been described in the present work. The governing boundary layer equations with associated boundary conditions for this phenomenon are converted to non-dimensional form using a suitable transformation. The resulting non-linear partial differential equations are then solved using the implicit finite difference method with Keller-box scheme. The numerical results in terms of the skin friction coefficient, the surface temperature, the velocity and the temperature profiles over the whole boundary layer are shown graphically for different values of the Prandtl number Pr, the magnetic parameter M, the thermal conductivity variation parameter γ, viscous dissipation parameter N and the Joule heating parameter J. Numerical results of the local skin friction co-efficient and the surface temperature profile for different values of N are presented in tabular form.Keywords: Joule heating; MHD; conduction; temperature dependent thermal conductivity; viscous dissipation;natural convection.DOI: 10.3329/jname.v5i2.2648Journal of Naval Architecture and Marine Engineering 6(1)(2009) 30-40
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Parveen, Nazma, and M. A. Alim. "Joule heating effect on magnetohydrodynamic natural convection flow along a vertical wavy surface." Journal of Naval Architecture and Marine Engineering 9, no. 1 (May 26, 2012): 11–24. http://dx.doi.org/10.3329/jname.v9i1.5954.

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In this paper, the effect of Joule heating on magnetohydrodynamic natural convection flow of viscous incompressible fluid along a uniformly heated vertical wavy surface has been investigated. The governing boundary layer equations with associated boundary conditions for this phenomenon are converted to nondimensional form using a suitable transformation. The equations are mapped into the domain of a vertical flat plate and then solved numerically employing the implicit finite difference method, known as the Keller-box scheme. Effects of pertinent parameters, such as the Joule heating parameter (J), Prandtl number (Pr), magnetic parameter (M) and the amplitude of the wavy surface ? on the surface shear stress in terms of the skin friction coefficient (Cfx), the rate of heat transfer in terms of local Nusselt number (Nux), the streamlines and the isotherms are discussed. A comparison with previously published work is performed and the results show excellent agreement. DOI: http://dx.doi.org/10.3329/jname.v9i1.5954 Journal of Naval Architecture and Marine Engineering 9(2012) 11-24
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Thuvanismail, Nasar, Sannasiraj Sannasi, and Sundar Vallam. "Liquid sloshing dynamics in a barge carrying container subjected to random wave excitation." Journal of Naval Architecture and Marine Engineering 9, no. 1 (June 17, 2012): 43–65. http://dx.doi.org/10.3329/jname.v9i1.7600.

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The sloshing phenomenon of liquid in a partially filled tank mounted rigidly on a barge exposed to random beam waves has been investigated through a well controlled experimental program. Four relative liquid depths, (liquid depth, hs/ length of tank, l) of 0.163, 0.325, 0.488 and 0.585 were considered for the tests. The sloshing oscillation was measured along the length of the tank at predefined locations. The effect of variation of the peak wave excitation frequency on the sloshing oscillation in the frequency domain is studied. The dominant energy is found to be concentrated around lowest nth sloshing mode frequency and, secondary peaks are observed at higher order sloshing frequencies. Odd modes contributions are dominating even modes irrespective of the excitation peak frequency. The sacrifice of second mode is observed while the excitation peak frequency is closer to its primary resonance. DOI: http://dx.doi.org/10.3329/jname.v9i1.7600 Journal of Naval Architecture and Marine Engineering 9(2012) 43-65
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Rouf, RA, MS Alam, and MAH Khan. "Approximation approach to multiple singularities of flow through a porous pipe with decelerating wall." Journal of Naval Architecture and Marine Engineering 9, no. 1 (June 18, 2012): 35–42. http://dx.doi.org/10.3329/jname.v9i1.9283.

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The multiple singularity behaviour of flow through a porous pipe with decelerating wall is numerically studied in the present paper. The behaviour of the Riccati equation is introduced as a model problem. Then the steady axisymmetric flow of a viscous incompressible fluid driven along a pipe by the combined effect of the wall deceleration and suction is investigated. Our approach uses the power series in order to observe the instability of the problems. The series is then summed by using various generalizations of the Pade´-Hermite approximants. Analysis based on approximate method suggests that the convergence of the series of stream-function, skin friction and centerline axial velocity in powers of Reynolds number is limited by a number of singularities. The location and nature of the singularities in the real plane are presented. The bifurcations of skin friction and centerline axial velocity are also depicted graphically. DOI: http://dx.doi.org/10.3329/jname.v9i1.9283 Journal of Naval Architecture and Marine Engineering 9(2012) 35-42
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36

Mukhopadhyay, Swati, and Rama S. R. Gorla. "Unsteady MHD boundary layer flow of an upper convected Maxwell fluid past a stretching sheet with first order constructive/destructive chemical reaction." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 24, 2012): 123–33. http://dx.doi.org/10.3329/jname.v9i2.12541.

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The mass transfer of unsteady two-dimensional flow of MHD non-Newtonian Maxwell fluid over a stretching surface in the presence of first order constructive/destructive chemical reaction is presented. Upper convected Maxwell (UCM) fluid model is used here to characterize the non-Newtonian behavior of the fluid. Using similarity solutions the governing partial differential equations are transformed to ordinary differential equations and are then solved numerically by shooting method. The flow field and mass transfer are significantly influenced by the governing parameters. The results show that fluid velocity initially decreases with increasing unsteadiness parameter (0 to 0.3) and concentration decreases significantly due to unsteadiness. The effect of increasing values of the Maxwell parameter (0 to 0.4) is to suppress the velocity field. The concentration is enhanced with increasing Maxwell parameter. The fluid velocity decreases with increasing magnetic parameter (0 to 0.3). DOI: http://dx.doi.org/10.3329/jname.v9i2.12541 Journal of Naval Architecture and Marine Engineering 9(2012) 123-133
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37

Vergara, Julio A., and Chris B. McKesson. "Marine Technology Nuclear Propulsion in High-Performance Cargo Vessels." Marine Technology and SNAME News 39, no. 01 (January 1, 2002): 1–11. http://dx.doi.org/10.5957/mt1.2002.39.1.1.

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It has been about 40 years since nuclear-powered merchant ships were seriously discussed in the naval architecture community. But recent developments in commercial shipping include bigger, faster, and more powerful ships, where nuclear propulsion may be an option worth considering. The development of advanced ship designs opens an opportunity for high-speed maritime transportation that could create new markets and recover a fraction of the high value goods currently shipped only by air. One of the vessels being considered is FastShip, a large monohull ship that would require 250 MW in 5 gas turbine-waterjet units. An estimate of the operation cost of FastShip reveals that its success relies heavily, among other things, on the fuel price, a single factor that comprises more than one third of the total operating costs. The alternative, a nuclear FastShip, would save, per trip, almost 5000 tons of exposure to fuel price fluctuation, and about half of this savings would further be available for additional cargo and revenues. Nuclear power results in a more stable operation due to the relatively constant low price of nuclear fuel. The nuclear power option is suitable for high-power demand and long-haul applications and a reactor pack could be available within the decade. A candidate design would be the helium-cooled reactor, which has been revisited by several nuclear reactor design teams worldwide. For the FastShip a suggested plant would consist of two modular helium reactors, each one with two 50 MW helium turbines and compressors geared to waterjet pumps, plus a single 50 MW gas turbine. This vessel becomes more expensive to build but saves in fuel, and still provides margin for cost, weight and size optimization. This paper discusses general characteristics of a FastShip with such a nuclear power plant and also highlights the benefits, drawbacks, pending issues and further opportunities for nuclear-powered high-speed cargo ships.
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38

Moran, K., M. Paulson, M. Lengkeek, P. Jeffery, and A. Frazer. "Deep Water Scientific Drilling in Lake Malawi, Africa." Marine Technology Society Journal 40, no. 1 (March 1, 2006): 29–35. http://dx.doi.org/10.4031/002533206787353637.

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A new deep water drilling system was developed and applied to recover deeply buried sediments for scientific analyses in one of the deep rift valley lakes of Africa—Malawi. This approach overcame the difficulty of maintaining position over a drill site in a remotely located, large, deep lake. Environmental conditions in Lake Malawi are similar to deep water marine settings and, as such, a marine approach was adopted for the Lake Malawi Drilling Project (LMDP). In February and March 2005, the modified pontoon, Viphya, successfully completed a scientific drilling expedition in Lake Malawi. This expedition recovered core at depths greater than 380 m below lake-floor in water depths as great as 600 m. The major refit of Viphya included installation of a moonpool, bridge, crew accommodations, mess, washroom, power system, dynamic positioning, and a drilling system. These major modifications required early pontoon surveys and naval architectural analyses and design work prior to their commencement. The expedition also used modified scientific coring tools with a marine geotechnical drilling rig for the first time, resulting in excellent core recovery and quality.
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39

Ranji, Ahmad Rahbar. "Rule-based equation for elastic tripping analysis of angle bar stiffeners." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 19, 2012): 103–11. http://dx.doi.org/10.3329/jname.v9i2.10443.

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Tripping is one of buckling modes in stiffened plates which could be occurred in the stiffeners with high flexural rigidity and low torsional rigidity. Rule-base expressions for calculation of sectorial moment of inertia of angle-bar stiffeners are scattered. An expression for calculation of sectorial moment of inertia of angle-bar stiffeners is derived based on energy method and beam theory. Sectorial moment of inertia of different angle-bar stiffeners are calculated and compared with the values calculated by different classification society rules. It is found that some of the rule-based equations for calculation of sectorial moment of inertia of angle-bar stiffeners are inaccurate. Euler tripping stress of different angle bars are calculated by energy method and compared with rule-based equation and finite element method. It is found that, rule-based expression for calculation of polar moment of inertia of angle-bar stiffeners neglects one term, which could lead up to 10% overestimation of Euler tripping stress. DOI: http://dx.doi.org/10.3329/jname.v9i2.10443 Journal of Naval Architecture and Marine Engineering 9(2012) 105-111
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40

Liu, Yingyi, Shigeo Yoshida, Hiroshi Yamamoto, Akinori Toyofuku, Guanghua He, and Shunhan Yang. "Response Characteristics of the DeepCwind Floating Wind Turbine Moored by a Single-Point Mooring System." Applied Sciences 8, no. 11 (November 20, 2018): 2306. http://dx.doi.org/10.3390/app8112306.

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In recent years, the SPM (Single-Point Mooring) concept has been widely employed in several branches of the naval architecture and marine engineering field, such as FPSOs (Floating Production, Storage and Offloading units), offshore oil rigs, etc., but not yet popular in the offshore wind energy. To investigate the response characteristics of an SPM-moored FWT (Floating Wind Turbine), in the present work, we perform a numerical study on the DeepCwind semisubmersible wind turbine, using the state-of-the-art open-source tool FAST. The free-decay test results show that the SPM layout affects the natural periods of the wind turbine in rotational modes, as well as the mooring stiffness of the diagonal rotational and crossing rotational-translational terms, especially in relation to the yaw mode. Comparisons of the RAOs (Response Amplitude Operators) elucidate that the presence of wind influences significantly the sway, roll and yaw motions of the SPM layout. Finally, the weathervane test shows that an asymmetry exists in the free-yaw motion response when the semisubmersible wind turbine is moored by an SPM system.
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41

Lee, Charles M. "A Review of Some Performance Characteristics of Monohull High-Speed Small Craft." Marine Technology and SNAME News 32, no. 04 (October 1, 1995): 258–66. http://dx.doi.org/10.5957/mt1.1995.32.4.258.

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ABSTRACT This paper presents a review of some parametric interrelationships between size, weight, hull proportions, propulsion power, and craft speed of modern, monohull, planing-type, marine craft. Parametric relationships are presented in terms related to lifting-surface theory rather than in more conventional "naval architectural" terms such as hull volume coefficients and area coefficients. The scope of the paper includes a brief review of the technical approach used to accomplish the analysis and typical results of the work. Charts which provide a means for approximation of power/ performance relationships are also presented. Performance estimates derived by means of the charts are compared with data derived from the careful and thorough testing of several full-size craft.
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42

Mostafa, N., M. Murai, R. Nishimura, O. Fujita, and Y. Nihei. "Study of motion of spar-type floating wind turbines in waves with effect of gyro moment at inclination." Journal of Naval Architecture and Marine Engineering 9, no. 1 (June 30, 2012): 67–79. http://dx.doi.org/10.3329/jname.v9i1.10732.

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Recently, a number of research groups have paid much attention to the study of Floating Offshore Wind Turbines (FOWTs). Similar to other offshore structures, the FOWTs are subjected to irregular waves and wind loads which cause a dynamic response in the structures. Under marine environmental conditions, they face many forces which prevent them from floating in the upright condition; they incline as a result of the winds, strong currents, typhoons, cyclones, storms etc. The motion of the FOWT might be changed by a change in gyroscopic effect which depends on the angular velocity and moment of inertia of the blade. Therefore, to investigate the effect of the gyro moment on the motion of the FOWT, two types of experiment were carried out in a water tank using a 1/360 scale model of a prototype FOWT. Firstly, the interaction between the rotary motion of the wind turbine blade and the dynamic motion of the SPAR-type FOWT was studied at small angles of inclination in regular waves. Secondly, the interaction between the change of rotational speed as well as moment of inertia of the blade and the motion of the FOWT was studied. In this paper, numerical calculations have been carried out using potential theory based on the 3D panel method. Finally, the experimental results are compared with the results of numerical simulation and findings are discussed. DOI: http://dx.doi.org/10.3329/jname.v9i1.10732 Journal of Naval Architecture and Marine Engineering 9(2012) 67-79
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43

Nasrin, Rehena. "Influence of centered conducting obstacle on MHD combined convection in a wavy chamber." Journal of Naval Architecture and Marine Engineering 8, no. 2 (November 22, 2011): 93–104. http://dx.doi.org/10.3329/jname.v8i2.7392.

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The development of centered heat conducting obstacle effect on combined magnetoconvective flow in a lid driven chamber has been numerically studied. The enclosure considered has rectangular horizontal lower surfaces and vertical side surfaces. The lower and upper surfaces are insulated. The left wall is mechanically lid driven having uniform temperature Ti and velocity v0 while other vertical side is wavy and maintains higher temperature Th than the lid. The governing two-dimensional flow equations have been solved by using Galerkin weighted residual finite element technique. The investigations are conducted for different values of Richardson number (Ri) and physical parameter i.e. diameter (D) of square solid body. Various characteristics such as streamlines, isotherms and heat transfer rate in terms of the mean Nusselt number (Nu), the average temperature (?av) of the fluid and temperature of obstacle center (?c) are presented. The results indicate that the mentioned parameters strongly affect the flow phenomenon and temperature field inside the chamber. Conducting largest obstacle is preferable for effective heat transfer mechanism in presence of magnetic field.Keywords: Combined convection, MHD, wavy chamber, heat conducting obstacle, finite element simulation.doi: http://dx.doi.org/10.3329/jname.v8i2.7392 Journal of Naval Architecture and Marine Engineering 8(2011) 93-104
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44

Nasrin, Rehena, and MA Alim. "Laminar Free and Forced magnetoconvection through an Octagonal Channel with a Heat Generating Circular Cylinder." Journal of Naval Architecture and Marine Engineering 9, no. 1 (May 26, 2012): 25–34. http://dx.doi.org/10.3329/jname.v9i1.7891.

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In this paper, hydromagnetic flow and thermal behaviors of fluid on free and forced convection inside an octagonal vertical channel are investigated. The channel consists of a centered heat generating hollow solid circular cylinder. The vertical and inclined walls of the octagon are insulated perfectly. The input and output opening are situated at the bottom and top surface respectively. The octagon is filled with electrically conducting fluid. The integral forms of the governing equations are solved numerically using Galerkin’s Weighted Residual Finite Element method. Computational domains are divided into finite numbers of body fitted control volumes with collocated variable arrangement. Results are presented in the form of average Nusselt number (Nu) and maximum temperature (?max) of the fluid for a selected range of magnetic parameter Hartmann number Ha (0 - 50). Streamlines and isothermal lines are also displayed for three different values (0.1, 1 and 10) of convection parameter (Ri) and for a fluid having magnetic field. The results indicate that the highest Nu and ?max are found for the absence of Ha in all convection regions. DOI: http://dx.doi.org/10.3329/jname.v9i1.7891 Journal of Naval Architecture and Marine Engineering 9(2012) 25-34
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45

Billah, Md Masum, M. J. H. Munshi, A. K. Azad, M. S. Uddin, and M. M. Rahman. "Numerical simulation of magneto-hydrodynamics mixed convection in an open channel having a semi-circular heater." Journal of Naval Architecture and Marine Engineering 9, no. 2 (December 19, 2012): 81–90. http://dx.doi.org/10.3329/jname.v9i2.8020.

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The present study is conducted to investigate heat and fluid flow in an open channel having a circular heater on the bottom surface under magnetic field. The semi-circle is heated isothermally and the other walls of the channel are kept adiabatic. The consequent mathematical model is governed by the coupled equations of mass, momentum and energy and solved by employing Galerkin weighted residual method of finite-element technique. A wide range of pertinent parameters such as Rayleigh numbers (Ra), and Hartmann numbers (Ha) are considered in the present study. In addition, the mixed convection regime is occurred due to buoyancy and shear forces. Various characteristics such as streamlines, isotherms and heat transfer rate in terms of the average Nusselt number (Nuav), average fluid temperature (?av), and Drag force (D) is investigated for the aforesaid parameters. The magnetic field is found as a control parameter on heat and fluid flow, particularly at higher Rayleigh numbers. It is observed that Hartmann numbers have a significant effect on average Nusselt number, average fluid temperature and Drag force.DOI: http://dx.doi.org/10.3329/jname.v9i2.8020 Journal of Naval Architecture and Marine Engineering 9(2012) 81-90
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46

Rahman, Mustafizur, M. A. Alim, Suman Saha, and M. K. Chowdhury. "Mixed Convection in a Vented Square Cavity with a Heat Conducting Horizontal Solid Circular Cylinder." Journal of Naval Architecture and Marine Engineering 5, no. 2 (June 15, 2009): 37–46. http://dx.doi.org/10.3329/jname.v5i2.2504.

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A finite element method based computational study of steady laminar mixed convection flow inside a vented square cavity with a heat conducting horizontal solid circular cylinder placed at the center of the cavity is carried out in this paper. The developed mathematical model is governed by the coupled equations of continuity, momentum and energy. The present work simulates practical systems such as cooling of electronic devices, ventilation of building etc. The effects of cylinder size and Richardson number on fluid flow and heat transfer performance are investigated. Richardson number is varied from 0.0 to 5.0 and the cylinder diameter is varied from 0.0 to 0.6. The results for the case of without cylinder are compared to those with cylinder to observe the effects cylinder on the flow and heat transfer inside the cavity. The phenomenon inside the cavity for the case of with and without cylinder is analyzed through streamline and isotherm patterns. It is found that the streamlines, isotherms, average Nusselt number at the heated surface, average temperature of the fluid in the cavity and dimensionless temperature at the cylinder center strongly depend on the Richardson number as well as the diameter of the cylinder.Keywords: Mixed convection, finite element method, Richardson number, cylinder diameter, vented cavity and diffusion.DOI: 10.3329/jname.v5i2.2504Journal of Naval Architecture and Marine Engineering 5(2)(2008) 37-46
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47

Hadipour, A., K. A. V. Abadi, H. Khanzadi, and H. Motahari. "Hydrodynamic Analysis of Noise Propagation By the High Skew Marine Propeller Working in Non-Uniform Inflow." International Journal of Applied Mechanics and Engineering 26, no. 1 (January 29, 2021): 104–21. http://dx.doi.org/10.2478/ijame-2021-0007.

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Abstract Being able to predict ship and marine propulsion noise is an important issue for naval architectures and the international maritime community. The main objective of this paper is the numerical investigation on the noise propagation by the high skew marine propeller working in a non-uniform inflow via RANS solver in the broadband frequency range. The pressure fluctuations were monitored at three points on the propeller blade, then by using the FFT operator we computed the blade passing frequency (BPF) for different propeller loading conditions. Based on these pressure pulses and adopting the Fowcs Williams-Hawking model we calculated noise radiated at the monitoring points. The results showed the BPF and noise level increased by increasing the load on the blades and we also observed that the noise generated at the leading edge was greater than at other points. Furthermore, the study of pressure fluctuations showed the propeller tip has more pressure variations in one revolution than other regions of the propeller surface.
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48

Mauro, Francesco, Luca Braidotti, and Giorgio Trincas. "A Model for Intact and Damage Stability Evaluation of CNG Ships during the Concept Design Stage." Journal of Marine Science and Engineering 7, no. 12 (December 8, 2019): 450. http://dx.doi.org/10.3390/jmse7120450.

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To face the design of a new ship concept, the evaluation of multiple feasible solutions concerning several aspects of naval architecture and marine engineering is necessary. Compressed natural gas technologies are in continuous development; therefore, there are no available databases for existing ships to use as a basis for the design process of a new unit. In this sense, the adoption of a modern multi-attribute decision-based method can help the designer for the study of a completely new ship prototype. A database of compressed natural gas ships was generated starting from a baseline hull, varying six hull-form parameters by means of the design of experiment technique. Between the attributes involved in the concept design process, stability is for sure one of the most relevant topics, both for intact and damaged cases. This work describes two approaches to identify the compliance of a ship with the intact stability regulations based on the ship main geometrical quantities. Moreover, a metamodel based on the maximum floodable length concept (damage stability) allows determining the main internal subdivision of the ship. The metamodel outcomes were compared with results from direct calculations on a ship external to the database, highlighting the adequate accuracy given by the developed methods.
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49

Senousy, Hamada, and Mahmoud Abou-Elmakarem. "A flexible system for initial ship design parameters estimation using a system of neural networks." Journal of Naval Architecture and Marine Engineering 8, no. 2 (November 29, 2011): 71–82. http://dx.doi.org/10.3329/jname.v8i2.6945.

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To initialize ship design process, it is very important to be able to develop an initial estimate of ship parameters to satisfy designer required specifications. For new emerging designs, this estimate has to be made based on a limited available set of examples. Moreover, a practical estimate prediction strategy should be flexible enough having no distinction between input (specified constraints) and outputs (parameters required to be estimated), since these vary from one design case to another. Conventional regression-based techniques, which are usually employed to provide the required estimates, suffer from low accuracy in case of a small number of available examples. In addition to that, they fail to capture the interrelation between different design parameters. To overcome these limitations and others, the present paper proposes a new approach based on a system of artificial neural-networks (ANNs). The new approach not only overcomes regression limitations but is also capable of providing a reliable estimate of initial design offset table based on different ANN outputs. The paper uses a case study for demonstrating the merits of the proposed approach.Keywords: Ship design; regression; ship series; Artificial Neural Networks (ANNs); Multilayer Perceptrons (MLPs); Normalized Gaussian Modified Lagrangian (NGML) doi: http://dx.doi.org/10.3329/jname.v8i2.6945 Journal of Naval Architecture and Marine Engineering 8(2011) 71-82
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50

Sakthivel, R., S. Vengadesan, and S. K. Bhattacharyya. "Application of non-linear k-e turbulence model in flow simulation over underwater axisymmetric hull at higher angle of attack." Journal of Naval Architecture and Marine Engineering 8, no. 2 (November 22, 2011): 149–63. http://dx.doi.org/10.3329/jname.v8i2.6984.

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This paper addresses the Computational Fluid Dynamics Approach (CFD) to simulate the flow over underwater axisymmetric bodies at higher angle of attacks. Three Dimensional (3D) flow simulation is carried out over MAYA Autonomous Underwater Vehicle (AUV) at a Reynolds number (Re) of 2.09×106. These 3D flows are complex due to cross flow interaction with hull which produces nonlinearity in the flow. Cross flow interaction between pressure side and suction side is studied in the presence of angle of attack. For the present study standard k-ε model, non-linear k-ε model models of turbulence are used for solving the Reynolds Averaged Navier-Stokes Equation (RANS). The non-linear k-ε turbulence model is validated against DARPA Suboff axisymmetric hull and its applicability for flow simulation over underwater axisymmetric hull is examined. The non-linear k-ε model performs well in 3D complex turbulent flows with flow separation and flow reattachment. The effect of angle of attack over flow structure, force coefficients and wall related flow variables are discussed in detail. Keywords: Computational Fluid Dynamics (CFD); Autonomous Underwater Vehicle (AUV); Reynolds averaged Navier-Stokes Equation (RANS); non-linear k-ε turbulence modeldoi: http://dx.doi.org/10.3329/jname.v8i2.6984 Journal of Naval Architecture and Marine Engineering 8(2011) 149-163
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