Comparison of Motion and Load Predictions with Full Scale Trial Measurements on CFAV QUEST.
Comparison of Motion and Load Predictions with Full Scale Trial Measurements on CFAV QUEST.

Author:

Publisher:

Published: 1997

Total Pages: 16

ISBN-13:

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Describes results of measurements and predictions of ship motions, hull pressure loads, and vertical bending moment loads from sea trials undertaken during various operational conditions in moderate seas. Motion and hull pressure spectra derived from the measurements are compared to predictions computed by combining regular wave transfer functions computed with PRECAL, a three-dimensional linear ship motion and load prediction code, with directional wave spectra collected with a directional wave buoy during a trial. Vertical bending moment spectra calculated in a similar manner are compared to bending moment spectra derived from measured strain spectra and full-ship finite element analysis.

Submarine Hydrodynamics
Submarine Hydrodynamics

Author: Martin Renilson

Publisher: Springer

Published: 2015-03-10

Total Pages: 163

ISBN-13: 3319161849

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This book adopts a practical approach and presents recent research together with applications in real submarine design and operation. Topics covered include hydrostatics, manoeuvring, resistance and propulsion of submarines. The author briefly reviews basic concepts in ship hydrodynamics and goes on to show how they are applied to submarines, including a look at the use of physical model experiments. The issues associated with manoeuvring in both the horizontal and vertical planes are explained, and readers will discover suggested criteria for stability, along with rudder and hydroplane effectiveness. The book includes a section on appendage design which includes information on sail design, different arrangements of bow planes and alternative stern configurations. Other themes explored in this book include hydro-acoustic performance, the components of resistance and the effect of hull shape. Readers will value the author’s applied experience as well as the empirical expressions that are presented for use at the preliminary design stage. A wide range of state-of-the-art material is included, and there are over fifty references to recent publications in the field. Intended for advanced students and professionals working in the specialised field of submarine hydrodynamics, this book brings theoretical and practical knowledge together in one comprehensive work that is particularly valuable to the submarine hydrodynamicist.

Development and Validation of Computational Ship Hydrodynamics
Development and Validation of Computational Ship Hydrodynamics

Author:

Publisher:

Published: 2003

Total Pages: 68

ISBN-13:

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As outlined in the grant proposal for the current project, Reference /1/, the overall technical objective for the current project was to investigate the maneuvering characteristics of a displacement vessel using the RANS code CFDSHIP-IOWA, with emphasis on the hull-rudder-propeller interaction. The numerical model was to be used to evaluate maneuvering characteristics by numerically performing the tests otherwise included in a physical Planar Motion Mechanism (PMM) test. At Force Technology - Division for Maritime Industry (formerly Danish Maritime Institute) experimental procedures and methods for analyzing model scale test results and extrapolation to full scale have been established over a 35-year period. Good general and detailed knowledge of maneuvering characteristics have consequently been gained during this period. It is recognized, however, that experimental work is both time-consuming and expensive when small alterations to an existing design are made during optimization of the maneuverability of a ship. In addition, PMM testing does not provide detailed knowledge of the flow regimes inducing the measured integral level forces. Since numerical procedures address both of these concerns Computational Fluid Dynamics (CFD) has been considered as an alternative to experimental work. CFD, has not, however, readily provided a tool for assessing maneuvering characteristics. To improve on this situation DMI initiated an R & D effort to develop methods in CFD to assess some of the basic hydrodynamic derivatives for a maneuvering ship.