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Study-Unit Description
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TITLE Manoeuverability Modelling Techniques

LEVEL 05 - Postgraduate Modular Diploma or Degree Course


DEPARTMENT Mechanical Engineering

DESCRIPTION Ship design entails various specialisations from structural to thermofluids understanding. This unit seeks to develop underpinning thermofluid science in an advanced form for characterising and understanding the behaviour of control surfaces via various modelling techniques. The modelling techniques can be categorised into three forms:
- analytical;
- emprical;
- numerical.

Analytical methods will entail the understanding of lift, drag and turning moment from basic principles correlating to the action of pressure and shear stresses on control surfaces. The theory is developed to provide a tool into sizing and designing control surfaces to meet both manoeuverability and stability criteria in a quick and rapid manner.

Empirical methods will draw on the analytical methods as a basis however substituting the convoluted analytical process with practical and more readily available experimental data that can applied to certain test cases.

Numerical methods which introduce a complete paradigm shift on how to characterise and design control surfaces and more importantly take into account various interaction effects such as propeller swirl and cavitation.

Study-unit Aims:

The aim of the study-unit is to expose students to various modeling techniques in manoeuverability. The students are first exposed to the underpinning science of control surfaces in hydrodynamics both from a historical and analytical point of view. The theories are developed up to the point where the fundamentals fluid mechanics science are then re-considered using a numerical framework. The latter introduces a novel approach to the design of a control surface in a detailed manner using computational fluid dynamics (CFD).

Important aspects of CFD pertaining to hydrodynamics control surface modelling are dealt with in detail starting from basic incompressible viscous flows progressing all the way to swirling cavitating flows that generally characterize hydrodynamics control surface behaviour.

Having acquired this knowledge the candidates are then expected to compile a test case study for a particular control surface on a specific marine vessel that would amalgamate, compare and contrast the various aspects of hydrodynamic modelling introduced.

Learning Outcomes:

1. Knowledge & Understanding
By the end of the study-unit the student will be able to:

- describe and contrast the requirements of manoeuvrability and directional stability on ship vessels;
- list and identify different control surface types and identify their function;
- calculate the turning moment of control surfaces provided knowledge of lift, drag and normal forces is acquired from empirical tables;
- state when a control is susceptible to cavitation via analysis;
- assess the impact of propellers upstream and swirling flows on the effectiveness control surfaces via the Gutsche correction and numerical analysis.

2. Skills
By the end of the study-unit the student will be able to:

- compile an operational window characteristic of a hydrodynamic control surface provided manoeuvrability and stability requirements;
- assemble a computational fluid dynamics (CFD) model provided knowledge of incompressible, viscous, swirling, two phase flows;
- justify model complexity when required;
- optimize propeller/rudder interaction via numerical and analytical techniques;
- report findings in a test case study and make design decisions about the control surfaces to be used based on the outcome of the modelling techniques engaged.

Main Text/s and any supplementary readings:

Main Text:

- Marine Rudders and Control Surfaces: Principles, Data, Design and Applications, Anthony F. Molland, Stephen R. Turnock, Butterworth-Heinemann; 1st Edition (September 26, 2007), ISBN-13: 978-0750669443.
- An Introduction to Computational Fluid Dynamics: The Finite Volume Method, H. Versteeg, W. Malalasekera, Pearson, 2nd Edition, (February 26, 2007), ISBN-13: 978-0131274983.

STUDY-UNIT TYPE Lecture, Independent Study, Project and Tutorial

Assessment Component/s Resit Availability Weighting
Project Yes 100%

LECTURER/S Simon Mizzi

The University makes every effort to ensure that the published Courses Plans, Programmes of Study and Study-Unit information are complete and up-to-date at the time of publication. The University reserves the right to make changes in case errors are detected after publication.
The availability of optional units may be subject to timetabling constraints.
Units not attracting a sufficient number of registrations may be withdrawn without notice.
It should be noted that all the information in the study-unit description above applies to the academic year 2017/8, if study-unit is available during this academic year, and may be subject to change in subsequent years.

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