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Viscous Effects On Numerical Prediction Of Motions Of Swath Vessels In Waves
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Book Synopsis Viscous Effects on Numerical Prediction of Motions of SWATH Vessels in Waves by :
Download or read book Viscous Effects on Numerical Prediction of Motions of SWATH Vessels in Waves written by and published by . This book was released on 2013 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The accurate prediction of motion in waves of a marine vehicle is essential to assess the maximum sea state vs. operational requirements. This is particularly true for small crafts, such as Autonomous Surface Vessels (ASV). Two different numerical methods to predict motions of a SWATH-ASV are considered: an inviscid strip theory initially developed at MIT for catamarans and then adapted for SWATHs and new a hybrid strip theory, based on the numerical solution of the radiation forces by an unsteady viscous, non-linear free surface flow solver. Motion predictions obtained by the viscous flow method are critically discussed against those obtained by potential flow strip theory. Effects of viscosity are analyzed by comparison of sectional added mass and damping calculated at different frequencies and for different sections, RAOs and motions response in irregular waves at zero speed. Some relevant conclusions can be drawn from this study: influence of viscosity is definitely non negligible for SWATH vessels like the one presented: amplitude of the pitch and heave motions predicted at the resonance frequency differ of 20% respectively and 50%; in this respect, the hybrid method with fully non-linear, viscous free surface calculation of the radiation forces turns out to be a very valuable tool to improve the accuracy of traditional strip theories, without the burden of long computational times requested by fully viscous time domain three dimensional simulations. Keywords: seakeeping; SWATH; viscous effects; viscous added mass and damping; Navier-Stokes equations solver for oscillating floating bodies; Autonomous Surface Vessels.
Book Synopsis Theoretical Prediction of Motion of Small-Waterplane-Area, Twin-Hull (SWATH) Ships in Waves by : C. M. Lee
Download or read book Theoretical Prediction of Motion of Small-Waterplane-Area, Twin-Hull (SWATH) Ships in Waves written by C. M. Lee and published by . This book was released on 1976 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear equations of motion with the hydrodynamic coefficients approximated by strip method are used to obtain the motion of small-waterplane-area, twin-hull (SWATH) ships in regular and irregular waves. The couplings among different modes of motion are separated into 3 independent groups: surge, heave-pitch and sway-roll-yaw; and the resulting equations of motions are treated in the frequency domain. The hydrodynamic coefficients of predominantly nonviscous nature, added mass and wavemaking damping, are obtained by strip theory. The effects of wave diffraction, viscous damping, and stationary stabilizing fins are included in the equations of motion within the framework of the linear frequency response of a body to waves. The assumptions involved in the evaluation of various hydrodynamic coefficients in the equation of motion are specified. The validity of the theoretical prediction of motion is checked by correlating with existing model experimental results, and the relevant discussions are made. In general, the theoretical prediction is satisfactory except the case of near zero-encounter frequency which can occur when a ship cruises with certain speed in stern-quartering waves.
Book Synopsis Maritime Technology and Engineering III by : Carlos Guedes Soares
Download or read book Maritime Technology and Engineering III written by Carlos Guedes Soares and published by CRC Press. This book was released on 2016-12-01 with total page 1226 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maritime Technology and Engineering 3 is a collection of papers presented at the 3rd International Conference on Maritime Technology and Engineering (MARTECH 2016, Lisbon, Portugal, 4-6 July 2016). The MARTECH Conferences series evolved from biannual national conferences in Portugal, thus reflecting the internationalization of the maritime sector. The keynote lectures and the papers, making up nearly 150 contributions, came from an international group of authors focused on different subjects in a variety of fields: Maritime Transportation, Energy Efficiency, Ships in Ports, Ship Hydrodynamics, Ship Structures, Ship Design, Ship Machinery, Shipyard Technology, afety & Reliability, Fisheries, Oil & Gas, Marine Environment, Renewable Energy and Coastal Structures. This book will appeal to academics, engineers and professionals interested or involved in these fields.
Book Synopsis Springer Handbook of Ocean Engineering by : Manhar R. Dhanak
Download or read book Springer Handbook of Ocean Engineering written by Manhar R. Dhanak and published by Springer. This book was released on 2016-07-23 with total page 1344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This handbook is the definitive reference for the interdisciplinary field that is ocean engineering. It integrates the coverage of fundamental and applied material and encompasses a diverse spectrum of systems, concepts and operations in the maritime environment, as well as providing a comprehensive update on contemporary, leading-edge ocean technologies. Coverage includes an overview on the fundamentals of ocean science, ocean signals and instrumentation, coastal structures, developments in ocean energy technologies and ocean vehicles and automation. It aims at practitioners in a range of offshore industries and naval establishments as well as academic researchers and graduate students in ocean, coastal, offshore and marine engineering and naval architecture. The Springer Handbook of Ocean Engineering is organized in five parts: Part A: Fundamentals, Part B: Autonomous Ocean Vehicles, Subsystems and Control, Part C: Coastal Design, Part D: Offshore Technologies, Part E: Energy Conversion
Book Synopsis Predicting the Motions of SWATH Ships in Waves. A Validated Mathematical Model by :
Download or read book Predicting the Motions of SWATH Ships in Waves. A Validated Mathematical Model written by and published by . This book was released on 1995 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mathematical model for predicting the motions of SWATH ships in waves in the frequency domain is presented. This mathematical model requires definition of only geometric and mass properties. While the mathematical model for the vertical plane presented here differs little from the one which has been used for about a decade, the transverse plane model differs from the previous model in various ways. Predictions are compared to measured model experimental responses to regular waves. These results show that the responses to regular waves are well-predicted for a range of hull forms and conditions.
Book Synopsis Lloyd’s Register Technical Association 1997-1998 by : Lloyd's Register Foundation
Download or read book Lloyd’s Register Technical Association 1997-1998 written by Lloyd's Register Foundation and published by Lloyd's Register . This book was released on 1997-01-01 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Lloyd’s Register Technical Association (LRTA) was established in 1920 with the primary objective of sharing technical expertise and knowledge within Lloyd’s Register. Publications have consistently been released on a yearly basis, with a brief interruption between 1938 and 1946. These publications serve as a key reference point for best practices and were initially reserved for internal use to maximise LR’s competitive advantage. Today, the LRTA takes a fresh approach, focusing on collaboration by combining professional expertise from across LRF & Group to ensure a frequent output of fresh perspectives and relevant content. The LRTA has evolved into a Group-wide initiative that identifies, captures, and shares knowledge spanning various business streams and functions. To support this modern approach, the LRTA has adopted a new structure featuring representatives and senior governance across the business streams and the LR Foundation. The Lloyd's Register Technical Association Papers should be seen as historical documents representing earlier viewpoints and are not reflective of current thinking and perspectives by the current LR Technical Association.
Book Synopsis Theoretical Prediction of Motion of Small-waterplane-area, Twin-hull (swath) Ships in Waves by : C. M. Lee
Download or read book Theoretical Prediction of Motion of Small-waterplane-area, Twin-hull (swath) Ships in Waves written by C. M. Lee and published by . This book was released on 1976 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: Linear equations of motion with the hydrodynamic coefficients approximated by strip method are used to obtain the motion of small-waterplane-area, twin-hull (SWATH) ships in regular and irregular waves. The couplings among different modes of motion are separated into 3 independent groups: surge, heave-pitch and sway-roll-yaw; and the resulting equations of motions are treated in the frequency domain. The hydrodynamic coefficients of predominantly nonviscous nature, added mass and wavemaking damping, are obtained by strip theory. The effects of wave diffraction, viscous damping, and stationary stabilizing fins are included in the equations of motion within the framework of the linear frequency response of a body to waves. The assumptions involved in the evaluation of various hydrodynamic coefficients in the equation of motion are specified. The validity of the theoretical prediction of motion is checked by correlating with existing model experimental results, and the relevant discussions are made. In general, the theoretical prediction is satisfactory except the case of near zero-encounter frequency which can occur when a ship cruises with certain speed in stern-quartering waves.
Book Synopsis Prediction of Motions of SWATH Ships in Following Seas by : Young S. Hong
Download or read book Prediction of Motions of SWATH Ships in Following Seas written by Young S. Hong and published by . This book was released on 1981 with total page 79 pages. Available in PDF, EPUB and Kindle. Book excerpt: To predict motions of SWATH ships in following seas, especially when the encounter frequency is small, unified slender-body theory has been applied. The longitudinal interaction term is computed and added to the results of the strip theory as a correction term. The added mass coefficients are computed to be much larger than those from strip theory, while damping coefficients are slightly less than two-dimensional results. There is improvement for heave motion for a limited range of frequencies, but the pitch motion is generally poor. To improve these results, further, the two-dimensional potential should be solved by the multipole expansion method rather than by the Frank close-fit method. (Author).
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1987 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Motions of SWATH Ships in Following Seas by :
Download or read book Prediction of Motions of SWATH Ships in Following Seas written by and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Naval Engineers Journal written by and published by . This book was released on 1988 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book BMT Abstracts written by and published by . This book was released on 1992 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Twenty-First Symposium on Naval Hydrodynamics by : National Research Council
Download or read book Twenty-First Symposium on Naval Hydrodynamics written by National Research Council and published by National Academies Press. This book was released on 1997-09-11 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Maritime Information Review written by and published by . This book was released on 1998 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Methods for Seakeeping Problems by : Bettar Ould el Moctar
Download or read book Numerical Methods for Seakeeping Problems written by Bettar Ould el Moctar and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book describes currently applied and newly developed advanced numerical methods for wave-induced ship motions and loads. Besides well-established computational methods based on strip theory, panel methods and finite volume methods for unsteady Reynolds-averaged Navier-Stokes equations (URANS), recent advances like a fully nonlinear Rankine panel method, URANS calculations including elastic hull deformations, and an improved method to predict added resistance in waves are explained in detail. Furthermore, statistical methods to assess extreme motions and loads are described both for linear and nonlinear responses in a stationary seaway as well as during long-term ship operations. Results of motions and loads, computed using the various methods, are compared with each other and with results of model experiments. Introductory chapters on fluid dynamics, motions of rigid and elastic ship hulls, numerical methods to compute fluid flows associated with wind waves, and the development and simulation of seaways complement the volume. The book will be of interest to post-graduate students, PhD candidates, as well as engineers in the field of naval architecture, ocean, and marine engineering.
Download or read book Ship Technology Research written by and published by . This book was released on 2005 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Viscous and Wave Resistance Calculations Including Interaction by : Lars Larsson
Download or read book Numerical Viscous and Wave Resistance Calculations Including Interaction written by Lars Larsson and published by . This book was released on 1983 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
