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Journal articles on the topic 'Wave resistance (Hydrodynamics)'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 August 2024

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1

Gotman, Ada. "Residual Resistance of Displacement Vessels." Journal of Marine Science and Engineering 8, no. 6 (2020): 400. http://dx.doi.org/10.3390/jmse8060400.

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The hydrodynamics of the residual resistance of ships is formulated for the first time: the residual resistance of vessel displacement is the result of the formation of retaining bow waves, Kelvin wave systems and their interaction—as well as the action of viscosity, which is expressed in the form of a turbulent subsurface boundary layer. Michell’s integral is taken as a basis for calculations of residual resistance. The two corrections take into account the shear layer of wave surface and the shift of the Kelvin bow system by the retaining waves. The correlation of the calculated and experime

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2

Du, Peng, Abdellatif Ouahsine, Philippe Sergent, Yannick Hoarau, and Haibao Hu. "Investigation on Resistance, Squat and Ship-Generated Waves of Inland Convoy Passing Bridge Piers in a Confined Waterway." Journal of Marine Science and Engineering 9, no. 10 (2021): 1125. http://dx.doi.org/10.3390/jmse9101125.

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The average and unsteady hydrodynamics of an inland convoy passing bridge piers in a confined waterway were investigated using both numerical and experimental approaches. The numerical simulations are realized by solving the RANS (Reynolds-averaged Navier–Stokes) equations accounting for the solid body motion using the sliding mesh technique, while the experiments were carried out in the towing tank. The advancing resistance, trim, sinkage and ship-generated waves were analyzed as functions of the water depth, distance between bridge piers, draught and velocity. The existence of the piers is f

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3

Oyuela, S., R. Sosa, A. D. Otero, F. P. Arribas, and H. R. Diaz-Ojeda. "An experimental and numerical hydrodynamic study on the Argentinian fishing vessels." IOP Conference Series: Materials Science and Engineering 1288, no. 1 (2023): 012047. http://dx.doi.org/10.1088/1757-899x/1288/1/012047.

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Abstract The purpose of this work is the validation of the hydrodynamic resistance for a small fishing vessel providing more details about the ship’s hydrodynamics. The selected ship is a traditional vessel that has been sailing in Argentina for more than 20 years without a previous numerical resistance evaluation. Because of the absence of previous numerical optimization, the ship might be a non-efficient vessel from a consumption, operating and polluting point of view. For this reason, in order to bring a more detailed evaluation of the flow around this hull, numerical studies are carried ou

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4

Jia, Jingbei, and Zhi Zong. "Experimental Study on the Configuration Hydrodynamics of Trimaran Ships." Journal of Marine Science and Application 21, no. 3 (2022): 46–55. http://dx.doi.org/10.1007/s11804-022-00281-y.

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AbstractThis paper presents experimental results on configuration hydrodynamics. Three models are used in the model tests, which are typical of hard, round, and soft chines. Although specific values are different, the influence patterns are similar in the three ship models. A set of different outrigger positions is investigated in calm water and regular waves. A variety of interesting phenomena are observed, among which the splash resistance is the dominant component for a trimaran at high speeds (with Froude number Fr > 0.6). If two small outriggers are placed inside Kelvin’s wave systems

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Kolesnichenko, Aleksandr Vladimirovich. "Simple waves and small perturbations in radiative gas dynamics." Keldysh Institute Preprints, no. 48 (2023): 1–34. http://dx.doi.org/10.20948/prepr-2023-48.

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The paper analyses one-dimensional simple waves and small-amplitude disturbances in radiating and scattering grey gas. The governing equation of radiation acoustics describing the dynamics of simple waves is derived. Radiation-thermal dissipation conditions and radiation resistance force are introduced into this equation to describe the propagation and attenuation of various radiation perturbation waves. To study non-equilibrium wave phenomena in a radiating medium, the phenomenological Whitham method is used. This method is an effective way to analyse fundamental modes when more than one velo

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6

Doctors, Lawrence J. "Reanalysis of the Sydney Harbor RiverCat Ferry." Journal of Marine Science and Engineering 9, no. 2 (2021): 215. http://dx.doi.org/10.3390/jmse9020215.

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In this paper, we revisit the hydrodynamics supporting the design and development of the RiverCat class of catamaran ferries operating in Sydney Harbor since 1991. More advanced software is used here. This software accounts for the hydrodynamics of the transom demisterns that experience partial or full ventilation, depending on the vessel speed. This ventilation gives rise to the hydrostatic drag, which adds to the total drag of the vessel. The presence of the transom also creates a hollow in the water. This hollow causes an effective hydrodynamic lengthening of the vessel, which leads to a re

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7

Waskito, Kurniawan Teguh, and Yanuar. "On the High-Performance Hydrodynamics Design of a Trimaran Fishing Vessel." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 83, no. 1 (2021): 17–33. http://dx.doi.org/10.37934/arfmts.83.1.1733.

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Trimaran hull form as multihull ship becomes more attractive these days in various ship types. It offers more advantages in terms of seakeeping performances, particularly on the application of a fishing vessel. However, thus far, the conventional design of fishing vessels is not favorable to ensure the safety of a vessel sailing in a rough sea. In conjunction with such issues, we discuss a trimaran fishing vessel design based on the seakeeping criterion to evaluate the dynamic stability, ship motion RAOs, and ship resistances at the initial design stages using linear strip theory. The intact s

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Arribas, F. P., S. Oyuela, A. D. Otero, R. Sosa, and H. R. Diaz-Ojeda. "The use of Ctrl+Z in ship design: removing a bulbous bow." IOP Conference Series: Materials Science and Engineering 1288, no. 1 (2023): 012044. http://dx.doi.org/10.1088/1757-899x/1288/1/012044.

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Abstract A bulbous bow is a widely employed feature to enhance the hydrodynamic resistance of ships. More than 95% of the merchant fleet incorporates various types of bulbous bows to reduce wave-making resistance and wave breaking. Bulbous bow is also utilized in smaller vessels like fishing vessels. In certain cases, the initial ship design includes the addition of a bulbous bow by default. In this study, which focuses on a typical Argentinian trawler fishing vessel, we investigate the impact of the bulbous bow on resistance. Taking a reverse approach, we modify the fishing vessel by removing

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9

Grimshaw, Roger. "Ernest Oliver Tuck 1939 - 2009." Historical Records of Australian Science 23, no. 2 (2012): 187. http://dx.doi.org/10.1071/hr12010.

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Ernie Tuck was one of Australia's most outstanding applied mathematicians, with an international reputation as a leading authority on water waves and ship hydrodynamics. He made seminal and incisive theoretical analyses in many areas, especially on wave resistance of slender ships and wave interaction with obstacles. His work is characterized by his ability to find the essentials of a complex problem, and then to apply apparently simple, but revealing analyses, using a combination of perturbation and asymptotic techniques with numerical calculations. He was an outstanding expositor, supervised

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10

Mandru, A., and F. Pacuraru. "The effect of appendages on ship resistance." IOP Conference Series: Materials Science and Engineering 1182, no. 1 (2021): 012041. http://dx.doi.org/10.1088/1757-899x/1182/1/012041.

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Abstract The availability of the robust commercial computational fluid dynamics (CFD) software and the increasing power of high-performance computers (HPC) boosts the use of CFD techniques for numerical investigations of ship hydrodynamimcs performaces. Nowadays, CFD tools provide a rather accurate solution for complex physical phenomena, such as wave braking, turbulence, flow detachment and overturning. Consequently, the ability to capture this fenomena allows a detailed insight into the flow mechanism that trigger and sustain them. The paper focuses on a numerical investigation of flow aroun

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11

Wilson, Robert V., Fred Stern, Hugh W. Coleman, and Eric G. Paterson. "Comprehensive Approach to Verification and Validation of CFD Simulations—Part 2: Application for Rans Simulation of a Cargo/Container Ship." Journal of Fluids Engineering 123, no. 4 (2001): 803–10. http://dx.doi.org/10.1115/1.1412236.

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Part 2 of this two-part paper provides an example case study following the recently developed comprehensive verification and validation approach presented in Part 1. The case study is for a RANS simulation of an established benchmark for ship hydrodynamics using a ship hydrodynamics CFD code. Verification of the resistance (integral variable) and wave profile (point variable) indicates iterative uncertainties much less than grid uncertainties and simulation numerical uncertainties of about 2%S1(S1 is the simulation value for the finest grid). Validation of the resistance and wave profile shows

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12

Doctors, Lawrence J., Alexander H. Day, and David Clelland. "Resistance of a Ship Undergoing Oscillatory Motion." Journal of Ship Research 54, no. 02 (2010): 120–32. http://dx.doi.org/10.5957/jsr.2010.54.2.120.

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In this paper, we describe extensions to the research of Doctors et al. (Doctors, L. J., Day, A. H., and Clelland, D., 2008, Unsteady effects during resistance tests on a ship model in a towing tank, Journal of Ship Research, 52, 4, 263–273) and Day et al. (Day, A. H., Clelland, D., and Doctors, L. J., 2009, Unsteady finite-depth effects during resistance tests in a towing tank, Journal of Marine Science and Technology, 14, 3, 387–397) in which the oscillations in the wave resistance during the constant-velocity phase of a towing-tank resistance test on a ship model were measured and predicted

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13

Ngoc, Vu Minh, Nguyen Thi Hai Ha, Pham Minh Ngoc, Dam Van Tung, Nguyen Huy Hao, and Tran Ngoc Tu. "Numerical Simulation Flow Around The 4600DWT Cargo Ship in Calm Water Condition Using RANSE Method." IOP Conference Series: Earth and Environmental Science 1278, no. 1 (2023): 012024. http://dx.doi.org/10.1088/1755-1315/1278/1/012024.

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Abstract Information about the flow field around the ship may enable the designers to improve ship hull form concerning ship hydrodynamics. The flow around the ship can be obtained through model tests in towing tank and simulations. However, the experimental method provides the most reliable data about flow around the ship, but this method is too expensive and time-consuming. Currently, the RANSE (Reynolds – averaged Navier – Stokes equation) method has been widely employed in predicting the ship resistance and flow around the ship in the ship design process due to it provides relatively accur

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14

Díaz Ojeda, Héctor Rubén, Sebastian Oyuela, Roberto Sosa, Alejandro Daniel Otero, and Francisco Pérez Arribas. "Fishing Vessel Bulbous Bow Hydrodynamics—A Numerical Reverse Design Approach." Journal of Marine Science and Engineering 12, no. 3 (2024): 436. http://dx.doi.org/10.3390/jmse12030436.

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Naval hydrodynamics typically focus on reducing ship resistance, which can be achieved by incorporating a bulbous bow. This feature is commonly used in the merchant fleet and smaller vessels, such as fishing boats, to minimize wave-making resistance. However, it is important to note that the use of a bulbous bow may not always be necessary or effective in all ship designs. In some cases, fishing ship designs may include a bulbous bow that is not optimized due to the use of procedures and methods intended for larger merchant ships or based on past experience. This study examines the effect of d

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15

Elhadad, Aladdin, Wen Yang Duan, and Rui Deng. "Comparative Investigation of an Automated Oceanic Wave Surface Glider Robot Influence on Resistance Prediction Using CFD Method." Applied Mechanics and Materials 710 (January 2015): 91–97. http://dx.doi.org/10.4028/www.scientific.net/amm.710.91.

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Thewave glideris composed of two parts: the float is roughly the size and shape of a surfboard that contains all the instrumentation needed for scientific experiments; the sub has wings and hangs 6 meters below on an umbilical tether. This difference allows wave energy to be harvested to produce forward thrust. According to the lake of design information and data for thewave glider, the main aim of the study is usingcomputational fluid dynamics (CFD)to present a method to predict calm water resistance for the floating part of thewave glider(the hull).Wigley parabolic hulland high speed round b

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16

Cheban, Egor Yu, Olga V. Martmianova, Artur I. Kozhevnikov, and Aleksandr A. Mol'kov. "Study of boat's appendages hydrodynamics by numerical methods." Russian Journal of Water Transport, no. 72 (September 20, 2022): 54–69. http://dx.doi.org/10.37890/jwt.vi72.272.

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The research was carried out by numerical methods of small scientific trimaran boat with ADCP-profiler as ship's appendages in the range of Froude numbers from 0,19 - 0,316. For тnumerical simulation was used the FineMarineTM software. Numerical modeling was performed for a trimaran without an installed ADCP-profiler and for two mounting options at different locations along the length of the trimaran and in depth. Two types of ADCP-profiler fastening were studied. Mounting the device in a parallelepiped ship trunk has a greater influence on the resistance and moment My. With increasing speed,

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17

Bokhove, O., A. Kalogirou, and W. Zweers. "From Bore–Soliton–Splash to a New Wave-to-Wire Wave-Energy Model." Water Waves 1, no. 2 (2019): 217–58. http://dx.doi.org/10.1007/s42286-019-00022-9.

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AbstractWe explore extreme nonlinear water-wave amplification in a contraction or, analogously, wave amplification in crossing seas. The latter case can lead to extreme or rogue-wave formation at sea. First, amplification of a solitary-water-wave compound running into a contraction is disseminated experimentally in a wave tank. Maximum amplification in our bore–soliton–splash observed is circa tenfold. Subsequently, we summarise some nonlinear and numerical modelling approaches, validated for amplifying, contracting waves. These amplification phenomena observed have led us to develop a novel w

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18

Bokhove, Onno, Anna Kalogirou, David Henry, and Gareth P. Thomas. "A novel wave-energy device with enhanced wave amplification and induction actuator." International Marine Energy Journal 3, no. 1 (2020): 37–44. http://dx.doi.org/10.36688/imej.3.37-44.

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A novel wave-energy device is presented. Both a preliminary proof-of-principle of a working, scaled laboratory version of the energy device is shown as well as the derivation and analysis of a comprehensive mathematical and numerical model of the new device. The wave-energy device includes a convergence in which the waves are amplified, a constrained wave buoy with a (curved) mast and direct energy conversion of the buoy motion into electrical power via an electro-magnetic generator. The device is designed for use in breakwaters and it is possible to be taken out of action during severe weathe

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19

Chastel, Thibault, Kevin Botten, Nathalie Durand, and Nicole Goutal. "Bulk drag coefficient of a subaquatic vegetation subjected to irregular waves: Influence of Reynolds and Keulegan-Carpenter numbers." La Houille Blanche, no. 2 (April 2020): 34–42. http://dx.doi.org/10.1051/lhb/2020015.

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Seagrass meadows are essential for protection of coastal erosion by damping wave and stabilizing the seabed. Seagrass are considered as a source of water resistance which modifies strongly the wave dynamics. As a part of EDF R & D seagrass restoration project in the Berre lagoon, we quantify the wave attenuation due to artificial vegetation distributed in a flume. Experiments have been conducted at Saint-Venant Hydraulics Laboratory wave flume (Chatou, France). We measure the wave damping with 13 resistive waves gauges along a distance L = 22.5 m for the “low” density and L = 12.15 m for t

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20

Fronsdal, Christian. "Theory of sounds in He II." Low Temperature Physics 49, no. 2 (2023): 151–57. http://dx.doi.org/10.1063/10.0016839.

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A dynamical model for Landau’s original approach to superfluid helium is presented, with two velocities but only one mass density. The second sound is an adiabatic perturbation that involves the temperature and the roton, aka the notoph. The action incorporates all the conservation laws, including the equation of continuity. With only 4 canonical variables it has a higher power of prediction than Landau’s later, more complicated model, with its 8 degrees of freedom. The roton is identified with the massless notoph. This theory gives a very satisfactory account of second and fourth sounds. Seco

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21

Corvaro, Sara, Alessandro Mancinelli, and Maurizio Brocchini. "FLOW DYNAMICS OF WAVES PROPAGATING OVER DIFFERENT PERMEABLE BEDS." Coastal Engineering Proceedings, no. 35 (June 23, 2017): 35. http://dx.doi.org/10.9753/icce.v35.waves.35.

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The analysis of the hydrodynamics over porous media is of interest for many coastal engineering applications as the wave propagation over permeable structures or gravel beaches. The study of a boundary layer evolving over permeable beds is important to a better understanding of the interactions between the flow over and inside the porous medium. An experimental study has been performed to analyze the dynamics produced when waves propagate over two kinds of permeable beds: spheres (regular permeability) and natural stones. For comparative purposes the same analysis has been extended to two roug

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22

Kara, Fuat. "Time Domain Prediction of Added Resistance of Ships." Journal of Ship Research 55, no. 03 (2011): 163–84. http://dx.doi.org/10.5957/jsr.2011.55.3.163.

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The prediction of the added resistance of the ships that can be computed from quadratic product of the first-order quantities is presented using the near-field method based on the direct pressure integration over floating body in time domain. The transient wave-body interaction of the first-order radiation and diffraction problems are solved as the impulsive velocity of the floating body by the use of a three dimensional panel method with Neumann-Kelvin method. These radiation and diffraction forces are the input for the solution of the equation of the motion that is solved by the use of the t

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23

Tuck, E. O. "The wave resistance formula of J.H. Michell (1898) and Its significance to recent research in ship hydrodynamics." Journal of the Australian Mathematical Society. Series B. Applied Mathematics 30, no. 4 (1989): 365–77. http://dx.doi.org/10.1017/s0334270000006329.

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AbstractJohn Henry Michell (1863–1940) published scientific papers only between 1890 and 1902, but included in his 23 papers from that short but productive period are some of the most important contributions ever made by an Australian mathematician. In this article I shall concentrate on the extraordinary 1898 paper “The wave resistance of a ship” Phil. Mag.(5) 45, 106–123. There are many reasons why this paper was an astounding achievement, but perhaps the most remarkable is that the resulting formula has not been improved upon to this day. In the computer age, many efforts have been made to

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24

Tun, Thu Han, and Ye Thet Htun. "THE EXPERIMENTAL METHOD AND CFD STUDY OF THE BARE HULL FORM OF UNDERWATER VEHICLE AT NEAR SURFACE CONDITION." ASEAN Engineering Journal 11, no. 1 (2021): 24–33. http://dx.doi.org/10.11113/aej.v11.16664.

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Hull form selection, resistance and powering are important in designing underwater vehicle. An underwater vehicle bare hull form is based on the five parameters due to the interaction between the propeller and the hull. When they are running on the surface condition, there will be problems likely as surface vessel, but the main hull of the underwater vehicle is below the waterline with low freeboard. The underwater vehicles are operating with high speed at a high Froude Number. Therefore, the wave making component becomes important in surface resistance. The wave making resistance of the under

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25

Wheeler, Miles P., Konstantin I. Matveev, and Tao Xing. "Numerical Study of Hydrodynamics of Heavily Loaded Hard-Chine Hulls in Calm Water." Journal of Marine Science and Engineering 9, no. 2 (2021): 184. http://dx.doi.org/10.3390/jmse9020184.

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Hard-chine boats are usually intended for high-speed regimes where they operate in the planing mode. These boats are often designed to be relatively light, but there are special applications that may occasionally require fast boats to be heavily loaded. In this study, steady-state hydrodynamic performance of nominal-weight and overloaded hard-chine hulls in calm water is investigated with computational fluid dynamics solver program STAR-CCM+. The resistance and attitude values of a constant-deadrise reference hull and its modifications with more pronounced bows of concave and convex shapes are

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26

Ntouras, Dimitris, George Papadakis, and Kostas Belibassakis. "Ship Bow Wings with Application to Trim and Resistance Control in Calm Water and in Waves." Journal of Marine Science and Engineering 10, no. 4 (2022): 492. http://dx.doi.org/10.3390/jmse10040492.

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Flapping foils for augmenting thrust production have drawn attention as a means of assisting ship propulsion in waves due to their high efficiency rate compared to traditional screw propellers. However, they can also offer substantial resistance reduction when used as stabilizers. In this work, the aim is to investigate the feasibility of a symbiotic concept combining the ship’s propeller with a foil arranged at the ship’s bow at a fixed position operating as a trim-pitch stabilizer. The work presents results obtained from experiments conducted in the towing tank of the Laboratory of Ship and

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27

Du, Lei, Zhuang Lin, Yi Jiang, Ping Li, and Yue Dong. "Numerical Investigation on the Scale Effect of a Stepped Planing Hull." Journal of Marine Science and Engineering 7, no. 11 (2019): 392. http://dx.doi.org/10.3390/jmse7110392.

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This article discusses the scale effects on a planing boat, utilizing the computational fluid dynamics method. The simulation is compared with a tank test for verification and validation. The planing boat sails use both aerodynamics and hydrodynamics. Studying the performances and wave patterns of different dimensions of the models is the best way to investigate the scale effect without using experimental data. The resistance is discussed in two parts, namely residuary resistance and friction resistance, and is compared to the calculated data using the international towing tank conference (ITT

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28

Dyakova, Tatyana A., Sergey O. Rozhdestvensky, Nikolai V. Marinich, and Alexey A. Rudnichenko. "Computational and experimental determination of waterjet aeration exposure in waves." Transactions of the Krylov State Research Centre 4, no. 394 (2020): 21–30. http://dx.doi.org/10.24937/2542-2324-2020-4-394-21-30.

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Object and purpose of research. The object of research was a model of a fast seaworthy boat with discretevariable bottom deadrise and two waterjet propulsors. The purposes of research were to experimentally determine hydrodynamic characteristics of the model in calm water and head regular waves corresponding to the irregular waves of sea states 3 and 4, as well as to determine the possibility of air penetration to waterjet inlets for two variants of their arrangement on model bottom in head-wave conditions, numerical simulation of the full-scale boat movement in oblique irregular waves (sea st

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29

Miloh, Touvia, and Eldad J. Avital. "Travelling-Wave Electrophoresis, Electro-Hydrodynamics, Electro-Rotation, and Symmetry- Breaking of a Polarizable Dimer in Non-Uniform Fields." Micromachines 13, no. 8 (2022): 1173. http://dx.doi.org/10.3390/mi13081173.

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A theoretical framework is presented for calculating the polarization, electro-rotation, travelling-wave dielectrophoresis, electro-hydrodynamics and induced-charge electroosmotic flow fields around a freely suspended conducting dimer (two touching spheres) exposed to non-uniform direct current (DC) or alternating current (AC) electric fields. The analysis is based on employing the classical (linearized) Poisson–Nernst–Planck (PNP) formulation under the standard linearized ‘weak-field’ assumption and using the tangent-sphere coordinate system. Explicit expressions are first derived for the axi

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Sulovsky, Ivan, Guillaume de Hauteclocque, Marilena Greco, and Jasna Prpić-Oršić. "Comparative Study of Potential Flow and CFD in the Assessment of Seakeeping and Added Resistance of Ships." Journal of Marine Science and Engineering 11, no. 3 (2023): 641. http://dx.doi.org/10.3390/jmse11030641.

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The need for maritime freight transport of various goods has never been greater. Consequently, ships are designed with ever-increasing dimensions, with the emphasis, of course, on length. One of the many challenges in the design of large ships is the prediction of their behavior in waves, i.e., motions, and consequently, added resistance. In this paper, a comparative study of two numerical tools for estimating ship motions and added resistance is presented. The first tool is the well-established DNV’s commercial seakeeping code Wasim, a weakly nonlinear potential flow (PF) solver based on a Ra

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Siva Prasad, A. V. S., and Sumit Basu. "Numerical study of mechanisms to minimize failure in a metal with soft backing under plane shock loading." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2182 (2015): 20150285. http://dx.doi.org/10.1098/rspa.2015.0285.

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In recent times, several experimental studies have reported improved ballistic penetration resistance and blast survivability of metallic structures to which an external coating of a soft elastomeric material has been applied. This work is aimed at understanding, through numerical simulations on a simple metal/elastomer flat plate geometry subjected to planar blast waves, the detailed mechanics of wave propagation, damage evolution and mitigation in a bilayer system. Void nucleation, growth and coalescence is assumed to be the damaging mechanism in the metal. A meshless technique based on smoo

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Usherenko, Yulia, Viktors Mironovs, Sergey Usherenko, Vjaceslavs Lapkovskis, and Andrei Shishkin. "Dynamic Alloying of Steels in the Super-Deep Penetration Mode." Materials 15, no. 6 (2022): 2280. http://dx.doi.org/10.3390/ma15062280.

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The dynamic effects observed in collisions represent a specific area of high-energy interaction located at the boundary of mechanics, hydrodynamics, shock wave physics, and alternating high-pressure regions. The paper shows that in the volume of a solid metal body, as a result of dynamic alloying by a high-speed stream of powder particles in the super-deep penetration mode (SDP), fiber structures of altering material arise, forming the framework of the composite material. The stream of powder particles in the metal obstacle following the path of least resistance and the impact of shock waves o

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Zhang, Yong, Zhong Li, and Aiming Yang. "Numerical Analysis on Self-Propulsion of a Waterjet-Propelled Ship with Different Propulsion Models." Applied Sciences 12, no. 14 (2022): 7148. http://dx.doi.org/10.3390/app12147148.

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The hydrodynamics of the waterjet-propelled ship is a challenging issue due to the sophistication of waterjet system geometry as well as waterjet–hull interaction. In current study, three different propulsion models, namely, multiple reference frame (MRF) model, sliding mesh model and body-force model, are utilized to simulate the self-propulsion of a waterjet-propelled ship model. A body-force model based on a User-Defined Function (UDF) on the ANSYS Fluent platform is proposed. The computational cost, wave pattern, jet stream surface, and self-propelled hull resistance of the MRF model and b

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Jindra, Daniel, Petr Hradil, and Jiří Kala. "Finite element analysis of concrete slab exposed to high velocity pressure wave – simplified vs. smoothed-particle hydrodynamics (SPH) method." MATEC Web of Conferences 396 (2024): 05005. http://dx.doi.org/10.1051/matecconf/202439605005.

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Many structures are required to sustain the structural resistance also under extreme loading conditions, for example impacts of high-velocity objects (airplane crash into nuclear power plant), impacts of projectiles (defence structures), or while exposed to high velocity pressure wave caused e.g. by explosion of various chemicals in industry, nature gas, or also conventional weapons. Numerical analyses of these phenomena are feasible while utilizing explicit approach of the finite element method (FEM), available in commercially accessible software LS-Dyna. In order to predict the behaviour of

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Khoirunnisa, Hanah, Wahyu Hendriyono, and Mardi Wibowo. "The Tsunami Simulation Generated by ‘Anak Krakatau’ Volcano Flank Collapse using MIKE 21Hydrodynamics Flexible Mesh with Manning Number Variation." Journal of Applied Geospatial Information 5, no. 1 (2021): 445–50. http://dx.doi.org/10.30871/jagi.v5i1.2288.

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This study aims to calculate the tsunami investment and the estimated arrival time at several locations around the Sunda strait, caused by the December 2018 Krakatao's eruption. The propagation of the tsunami wave is simulated using MIKE 21 Hydrodynamics Flexible Mesh (HD FM). The spatial data consist of the bathymetry and topography of the Sunda Strait area and its surroundings, whilst assumptions are made on the tsunami source topology and its exact location. Several runs of the simulation are then conducted by varying the Manning Number, i.e. bed resistance values, at the tsunami source and

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Colomer, Jordi, and Teresa Serra. "The World of Edges in Submerged Vegetated Marine Canopies: From Patch to Canopy Scale." Water 13, no. 17 (2021): 2430. http://dx.doi.org/10.3390/w13172430.

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This review describes the world of edges in submerged vegetated marine canopies (seagrasses, saltmarshes, and seaweeds) where an edge is a boundary with a frontal area separating the vegetation from the adjacent non-vegetated zones. Plants within the vegetation are made of flexible elements pronating in the direction of the flow and oscillating back and forth in response to wave forcing. Some of them also occupy the full height within the water body. The analysis focuses on both the canopy- and local-patch scales to acquire knowledge about the hydrodynamics and the biophysical interactions in

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Ungureanu, Costel, and Claudia-Veronica Ungureanu. "NUMERICAL INVESTIGATIONS ON THE FREE SURFACE FLOW AROUND WING-BODY JUNCTIONS." International Journal of Modern Manufacturing Technologies 14, no. 2 (2022): 272–79. http://dx.doi.org/10.54684/ijmmt.2022.14.2.272.

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Starting with January 2013, all ships greater than 400 tons engaged in international voyages must comply with the Energy Efficiency Design Index (EEDI), and starting with January 2023 also with the Efficiency Existing Ship Index (EEXI), issued by the International Maritime Organization, (IMO). Knowing that, in general, a ship hull is the result of a compromise between the main dimensions imposed by the size of the locks, navigation route depth, port depth, taxes, transport capacity (deadweight, volume), ship equipment (machinery, deck installations, piping systems), hydrostatic performances an

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Kashiwagi, Masashi. "Hydrodynamic Study on Added Resistance Using Unsteady Wave Analysis." Journal of Ship Research 57, no. 04 (2013): 220–40. http://dx.doi.org/10.5957/jsr.2013.57.4.220.

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It is known that the added resistance in waves can be computed from ship-generated unsteady waves through the unsteady wave analysis method. To investigate the effects of nonlinear ship-generated unsteady waves and bluntness of the ship geometry on the added resistance, measurements of unsteady waves, wave-induced ship motions, and added resistance were carried out using two different (blunt and slender) modified Wigley models. The ship-generated unsteady waves are also produced by the linear superposition using the waves measured for the diffraction and radiation problems and the complex ampl

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Altomare, Corrado, Angelantonio Tafuni, José M. Domínguez, Alejandro J. C. Crespo, Xavi Gironella, and Joaquim Sospedra. "SPH Simulations of Real Sea Waves Impacting a Large-Scale Structure." Journal of Marine Science and Engineering 8, no. 10 (2020): 826. http://dx.doi.org/10.3390/jmse8100826.

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The Pont del Petroli is a dismissed pier in the area of Badalona, Spain, with high historical and social value. This structure was heavily damaged in January 2020 during the storm Gloria that hit southeastern Spain with remarkable strength. The reconstruction of the pier requires the assessment and characterization of the wave loading that determined the structural failure. Therefore, a state-of-the-art Computational Fluid Dynamic (CFD) code was employed herein as an aid for a planned experimental campaign that will be carried out at the Maritime Engineering Laboratory of Universitat Politècni

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Sakamoto, Nobuaki, Robert Vance Wilson, and Frederick Stern. "Reynolds-Averaged Navier-Stokes Simulations for High-Speed Wigley Hull in Deep and Shallow Water." Journal of Ship Research 51, no. 03 (2007): 187–203. http://dx.doi.org/10.5957/jsr.2007.51.3.187.

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Reynolds-averaged Navier-Stokes simulations and verification and validation studies for a high-speed Wigley hull in deep and shallow water are presented using CFD-SHIP-IOWA Version 4.00, which is a general-purpose ship hydrodynamics computational fluid dynamics code: single-phase level set free surface and k-w turbulence modeling; higher-order conservative discretization, embedded overset grids, advanced iterative solvers, and implicit coupling flow field and predicted motions numerical methods; and high-performance computing for message-passing interface (MPI)-based domain decomposition. The

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Готман, А. Ш. "Calculation of the residual resistance of the vessel according to the theoretical drawing." MORSKIE INTELLEKTUAL`NYE TEHNOLOGII), no. 4(50) (November 21, 2020): 24–40. http://dx.doi.org/10.37220/mit.2020.50.4.003.

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В статье впервые дан метод расчета остаточного сопротивления водоизмещающих судов не по параметрам, а по ординатам теоретического чертежа. Необходимость определения сопротивления воды движению судна возникает на первой же стадии при проектировании корпуса. Достоверную кривую сопротивления получают только путём дорогостоящих буксировочных испытаний, поэтому возможность расчета такой кривой является одной из самых актуальных задач проектирования, решению которой посящены сотни работ. В статье вкратце приводится вековая история поисков метода расчета сопротивления воды движению судна. В статье оп

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Han, Shuai, Lin Yang, and Qidan Zhu. "Numerical Simulation of Ship-added Resistance Based on a Numerical Wave Tank." Journal of Physics: Conference Series 2747, no. 1 (2024): 012039. http://dx.doi.org/10.1088/1742-6596/2747/1/012039.

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Abstract The wave resistance increase of a ship during its actual voyage can affect its speed and safety. To design ships with excellent sailing performance, it is necessary to accurately predict the wave resistance increase of a ship in waves, as well as the motion response and wave resistance prediction of ships in waves, which involves complex hydrodynamic problems. This paper first establishes a physical model of the KCS vessel, then utilizes the numerical wave tank platform independently developed by our university. Based on viscous flow theory, it calculates the resistance of the KCS und

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Sulistyawati, W., _. Yanuar, and A. S. Pamitran. "Michell Investigation of the Significant Influence on the Hydrodynamic of a Warp-Chine Pentamaran." Journal of Ship Production and Design 36, no. 03 (2020): 202–12. http://dx.doi.org/10.5957/jspd.02190011.

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This study attempted to investigate the hydrodynamic performance of various pentamaran configurations with a focus on the interference flow around the component hulls. A computer simulation was conducted based on Michell’s thin ship theory alongside a commercial CFD computation as a comparison. Experiments in the towing tank were performed to validate the numerical calculations, resulting in some hydrodynamic characteristics on the far-field wave pattern, wave interference, wave resistance, and total resistance. Analyses on both transversal and divergent waves were performed to assess the magn

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Soomere, Tarmo. "Nonlinear Components of Ship Wake Waves." Applied Mechanics Reviews 60, no. 3 (2007): 120–38. http://dx.doi.org/10.1115/1.2730847.

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Nonlinear components of wakes from large high-speed ships at times carry a substantial part of the wake energy and behave completely differently compared to the classical Kelvin wave system. This overview makes an attempt to summarize the descriptions of nonlinear parts of a ship’s wake. For completeness, also the basic properties of the Kelvin wake are sketched. The central topic is the generation of solitons by ship motion both in channels and in unbounded sea areas. The discussion is mostly limited to disturbances on the surface of nonstratified water. The optional nonlinear components of t

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Beck, S. M., H. Haider, and R. F. Boucher. "Transmission Line Modelling of Simulated Drill Strings Undergoing Water-Hammer." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 209, no. 6 (1995): 419–27. http://dx.doi.org/10.1243/pime_proc_1995_209_172_02.

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Drill strings and oil production lines are examples of fluid systems for which time-dependent (dynamic) as well as steady state (static) analysis is increasingly needed. These systems are difficult and expensive to instrument and test experimentally. Developments of fluidic non-moving-part controllers to produce water-hammer pulsations stimulated a need to simulate the fluid dynamics of such drill strings to aid the design work. The method of simulation chosen was transmission line modelling (TLM). It is essentially a time-delay method, borrowing its main concepts and the fundamentals of its c

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Chen, Shuling, Beilei Zou, Changzhi Han, and Shiqiang Yan. "Comparative Study on Added Resistance and Seakeeping Performance of X-Bow and Wave-Piercing Monohull in Regular Head Waves." Journal of Marine Science and Engineering 10, no. 6 (2022): 813. http://dx.doi.org/10.3390/jmse10060813.

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Bow shape has been recognized as an important factor influencing the seakeeping performance and added resistance of ships. This paper presents a numerical comparative study on added resistance and seakeeping of model ships with ‘X-bow’ and a wave-piercing monohull in regular head waves using a computational fluid dynamics (CFD) software. Different wave heights, wavelengths and forward speeds are considered in the systematic investigation in order to characterize the added resistance and wave-induced motions, and to explore the local wave patterns. The results show a considerably different hydr

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Kautsar, Nafiri Muhammad, and I Ketut Suastika. "Analysis of The Effect of Hull Vane Lifting Force on Fast Vessel Resistance: Straight Hull Vane." WAVE: Jurnal Ilmiah Teknologi Maritim 17, no. 1 (2023): 22–33. http://dx.doi.org/10.55981/wave.2023.926.

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In previous studies by Saputra, the use of straight Hull Vane® increased ship's resistance. Based on hypothesis, this was caused by lifting force from Hull Vane® being too large, so that ship experienced bow trim. To reduce bow trim, smaller Hull Vane® was made including Hull Vane® with AR = 8.5, AR = 22.9 and AR = 28.94 with speeds which were 11 knots (Fn = 0.34), 17 knots (Fn = 0.53), 20 knots (Fn = 0.62) and 26 knots (Fn = 0.8). From simulation results, it was found that use of a straight Hull Vane® in every aspect ratio variation on vessel was only effective at 11 knots speed which could r

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Chernyshev, Lev, Natalia Kabaliuk, Mark Jermy, Simon Corkery, and Daniel Bernasconi. "Developing methods of decomposing the physical resistance components acting on a hydrofoil." IOP Conference Series: Materials Science and Engineering 1288, no. 1 (2023): 012038. http://dx.doi.org/10.1088/1757-899x/1288/1/012038.

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Abstract The America’s Cup is a sailing competition contested by teams fielding bespoke yachts designed and built to the AC75 class regulations. These yachts make use of hydrofoils, which permit them to lift their hulls above the water surface. When in this “foiling” regime, the drag forces on the hull are drastically lower, permitting greater sailing speed. Predicting hydrodynamic forces produced from hydrofoils on race yachts remains challenging, due to a wide operating regime and complex hydrodynamical phenomena. In this study, existing wake survey methods of decomposing the total drag forc

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Mei, Chiang C., and Hang S. Choi. "Forces on a slender ship advancing near the critical speed in a wide canal." Journal of Fluid Mechanics 179 (June 1987): 59–76. http://dx.doi.org/10.1017/s0022112087001435.

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Employing matched asymptotics, we extend the recent theory of Mei (1986) to study the phenomenon of upstream influence by a slender ship moving near the critical speed. For a special class of channel width and ship slenderness, it is shown that the response on the sea surface is essentially one-dimensional with the wave crests perpendicular to the ship's axis. In particular, solitons are radiated upstream. The hydrodynamic pressure on the ship, as well as the total sinkage force, wave resistance and trimming moment are calculated. These forces are functions of time despite the constant speed o

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Gao, Qingze, Lifei Song, and Jianxi Yao. "RANS Prediction of Wave-Induced Ship Motions, and Steady Wave Forces and Moments in Regular Waves." Journal of Marine Science and Engineering 9, no. 12 (2021): 1459. http://dx.doi.org/10.3390/jmse9121459.

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The wave-induced motions, and steady wave forces and moments for the oil tanker KVLCC2 in regular head and oblique waves are numerically predicted by using the expanded RANS solver based on OpenFOAM. New modules of wave boundary condition are programed into OpenFOAM for this purpose. In the present consideration, the steady wave forces and moments include not only the contribution of hydrodynamic effects but also the contribution of the inertial effects due to wave-induced ship motions. The computed results show that the contribution of the inertial effects due to heave and pitch in head waves

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