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Escort tug hydrodynamics: Analysis o...

Molyneux, William David.

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Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles./
Author:	Molyneux, William David.
Description:	303 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6225.
Contained By:	Dissertation Abstracts International68-09B.
Subject:	Engineering, Marine and Ocean. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR31325
ISBN:	9780494313251

Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles.
Molyneux, William David.

Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles. - 303 p.

Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6225.

Thesis (Ph.D.)--Memorial University of Newfoundland (Canada), 2007.

The ship hydrodynamics literature contains little information on a hull at a yaw angle greater than that commonly encountered in ship manoeuvring. New ship types, such as escort tugs with very low aspect ratio fin keels, will benefit from an analysis of the hydrodynamics that occurs at yaw angles between 20 and 45 degrees. Computational Fluid Dynamics (CFD) is an important technique that could be used for this analysis, but the accuracy of predicted forces and flow patterns at high yaw angles was unknown prior to this research.

ISBN: 9780494313251Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles.
LDR:02976nam 2200277 a 45 001 939684
005 20110517
008 110517s2007 ||||||||||||||||| ||eng d
020 $a 9780494313251
035 $a (UMI)AAINR31325
035 $a AAINR31325
040 $a UMI $c UMI
100 1 $a Molyneux, William David. $3 1263791
245 1 0 $a Escort tug hydrodynamics: Analysis of flow around ships at large yaw angles.
300 $a 303 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-09, Section: B, page: 6225.
502 $a Thesis (Ph.D.)--Memorial University of Newfoundland (Canada), 2007.
520 $a The ship hydrodynamics literature contains little information on a hull at a yaw angle greater than that commonly encountered in ship manoeuvring. New ship types, such as escort tugs with very low aspect ratio fin keels, will benefit from an analysis of the hydrodynamics that occurs at yaw angles between 20 and 45 degrees. Computational Fluid Dynamics (CFD) is an important technique that could be used for this analysis, but the accuracy of predicted forces and flow patterns at high yaw angles was unknown prior to this research.
520 $a A new data set of three-dimensional flow vectors in planes around an escort tug model was obtained using Particle Image Velocimetry (PIV). These data were used to validate the flow vectors predicted by a commercial CFD code. As part of the validation study, a method for numerically analyzing the difference between measured and predicted flow vectors was developed. The method was used to evaluate CFD predictions of flow patterns around a conventional hull (at 10 and 35 degrees yaw) against published experimental results.
520 $a The type of computational mesh was found to affect the accuracy of the forces predicted for a hull with a yaw angle, but different hull types needed different meshing approaches. The forces at 10 degrees yaw for a typical high-speed merchant ship were predicted to within 5% of experimental results using an unstructured tetrahedral mesh, whereas a structured hexahedral mesh gave force predictions accurate to within 15%. For the escort tug model, which was a wider and shallower hull shape, the situation was reversed, and the structured mesh gave force predictions accurate to within 5% of the experimental data up to 40 degrees yaw. There was no noticeable difference in the predicted flow patterns between meshing approaches for the tug model. Mean flow vector magnitudes were within 10% of measured values.
520 $a As a result of this research PIV has been developed into a practical technique for measurements around a hull with a yaw angle and CFD has been shown to give insights into the flow around an escort tug and its appendages, within a specified level of accuracy.
590 $a School code: 0306.
650 4 $a Engineering, Marine and Ocean. $3 1019064
690 $a 0547
710 2 $a Memorial University of Newfoundland (Canada). $3 1017906
773 0 $t Dissertation Abstracts International $g 68-09B.
790 $a 0306
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR31325