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Practical Ship Hydrodynamics E.C Tupper


Practical Ship Hydrodynamics Written by Volker Bertram, published by Butterworth- Heinemann, Elsevier, Oxford, UK as a softcover, 2012, 390 pp.


ISBN 13; 978-0-08-097150-6, £60.00 (US$99.95).


of the final chosen form for a new ship. Model testing and full scale trials are needed to validate the results of


the


computational methods including scale effects. Unfortunately there is not a lot of


full scale data available, although A


speed trials do not these days require runs on the traditional measured mile. GPS systems enable such trials to be carried out away from land without the risk of effects from shallow water. To give a feel for the coverage provided in the book,


there are six


dvances in this subject have been significant in the 12 years since the first edition of


this book was published. It is therefore timely to have an updated version. Volker Bertram is a senior project


manager at class society Germanischer Lloyd, and formerly project manager at Hamburg Ship Model Basin and professor of ship design at the Technical University of Hamburg, Germany. He is therefore very well qualified to write an authoritative text on this subject. Practical Ship Hydrodynamics


provides a comprehensive overview of hydrodynamic experimental and numerical methods for ship resistance and propulsion, manoeuvring, seakeeping


and vibration. It has


been thoroughly revised to cover the developments in computational methods and modelling techniques since 2000. New material covers hydrodynamic aspects of ship vibrations, following on from the rigid body movements of the ship in waves, and propulsion improvements now being made for fuel efficiency. There is increased coverage of simple design estimates of a ship’s hydrodynamic characteristics including resistance and wake fraction. This is not an easy subject and a good knowledge of general fluid dynamics is assumed.


One-stop resource The author begins with an overview of problems and approaches, including the basics of modelling and full scale testing. He points out that the series


48


model test data available is now quite dated. Nowadays


the effects of the


methodical variation of hull parameters can be studied using computational fluid dynamics (CFD) techniques leading to a ‘numerical hull series’. Model tests are still used to confirm the performance


chapters with the details of boundary element methods from the first edition relegated to an appendix. Chapter 1 (40 pages) is a general introduction covering numerical approaches, including various CFD techniques, and viscous flow computations. The remaining five chapters deal


with propellers (32), resistance and propulsion (70), seakeeping (62), vibrations (36) and manoeuvring (58). The numbers


in parenthesis


“Practical Ship Hydrodynamics provides a


comprehensive overview of hydrodynamic experimental and numerical methods for ship resistance and propulsion, manoeuvring, seakeeping and vibration”


show the number of pages devoted to each. Experimental methods – model and full scale _ are covered as well as calculations. As an example, the chapter on ship seakeeping covers experimental approaches, waves and the seaway, numerical prediction of of seakeeping, slamming and roll motion. For the faster dissemination of research


results in CFD, the author initiated a series of conferences under the banner of the Numerical Towing Tank Symposium. Proceedings can be downloaded from www.uni-due.de/IST/ismt_nutts8. The book combines otherwise


disparate information on the factors affecting ship hydrodynamics into one practical, go-to resource. It is aimed at senior undergraduates and post graduate students. It will be useful for the practising naval architect, especially design/ hydrodynamics technical specialists, and marine engineer as a reference work and as a means of updating their knowledge on how these important ship performance characteristics are, and can be, assessed. SBI


Ship & Boat International March/April 2012


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