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Faculté des Sciences appliquées
Faculté des Sciences appliquées
MASTER THESIS
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Standard Manoeuvres Simulation of a Fishing Vessel

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Patalong, Krzysztof Jozef ULiège
Promotor(s) : Obreja, Dan
Date of defense : 2012 • Permalink : http://hdl.handle.net/2268.2/6099
Details
Title : Standard Manoeuvres Simulation of a Fishing Vessel
Author : Patalong, Krzysztof Jozef ULiège
Date of defense  : 2012
Advisor(s) : Obreja, Dan 
Language : English
Number of pages : 119
Discipline(s) : Engineering, computing & technology > Civil engineering
Target public : Researchers
Professionals of domain
Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master de spécialisation en construction navale
Faculty: Master thesis of the Faculté des Sciences appliquées

Abstract

[en] Fishing at sea has been known for many years as one of the most dangerous occupations in the world. According to IMO statistical data (1999), over 24,000 lives are lost world-wide every year during fishing operation as the vessels would often operate in the most harsh conditions in the open sea. For this reason, the safety of their operation and performance should be circumstantially examined. In this thesis, the manoeuvring performance of a typical Mediterranean Sea fishing vessel is investigated. The obtained results should provide some new valuable hydrodynamic information into the common database of existing hullforms, since a rather complex and uncommon hull shape with a double hard chine and inclined bar keel puts this vessel out of the range of typical forms. Additionally, due to her moderately small length, the vessel operates at fairly high Froude number, making the investigation even more challenging. The main steps undertaken in order to achieve the goal of the thesis consist of: design of a rudder geometry, estimation of the hydrodynamic forces and moments generated on the rudder in order to determine the position and diameter of the rudder stock, preliminary checking of the rudder cavitation and estimation of the manoeuvring performance by means of the preliminary methods (based on regression formulas and linear hydrodynamic models) as well as simulation codes based on non-linear hydrodynamic models. In order to resolve above-mentioned problems, the following investigation methods are used:  Voitkounsky method (1985), in correspondence with PHP Galati University program (Preliminary Hydrodynamics Performance), to preliminary estimate the hydrodynamic forces and moments on the rudder as well as the position of the rudder stock;  CFD methods and ShipFlow code, with non-zero drift angles and rudder deflection applied, to determine the hydrodynamic forces and moments acting on the hull and on the rudder;  Brix method (1993) to verify the rudder cavitation (with the use of PHP code);  Clarke (1982) regression empirical formulae and linear mathematical models in correspondence with MPP Michigan University program, to estimate the characteristics of the turning circle and the dynamic stability parameter;  Non-linear mathematical models applied in the PHP code (Abkowitz model, 1964) and TRIBON commercial software, in order to simulate the standard manoeuvres in timedomain (turning circle, zig-zag test and spiral manoeuvre) and to determine the vessel‟s manoeuvring performance. Finally, the similarities between obtained numerical and provided experimental results are examined with the following observations and conclusions derived:  Existing preliminary codes based on empirical formulas and linear mathematical models should be used, with fair attention paid to, only in the initial design stage of a vessel;  Time-domain simulation codes based on non-linear mathematical models, hence providing more accurate manoeuvring performance characteristics, can be used in the basic design stage, simultaneously with the CFD codes and/or experimental tests, in order to determine the hydrodynamic derivatives of a given vessel.


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