PhD Scholarship in Added Resistance of Ultra-Slow Ships

DTU Mechanical Engineering covers the fundamental engineering disciplines within Naval Architecture, Offshore and Coastal Engineering, Energetics, Solid Mechanics, Fluid Mechanics, Thermodynamics, Control and Engineering Design, Structural Engineering and Materials. It has a scientific staff of about 100 persons, 90 Ph.D. students and a technical/administrative support staff of 50 persons.

A PhD scholarship is available at DTU Mechanical Engineering in the field of wave forces on slow-speed ships. The department has well-established research programs in Naval Architecture and Marine Engineering, as well as Mathematical and Numerical Modeling of Ocean waves and their interaction with Floating Structures. This project is partially funded by an EU 7th framework programme grant to investigate the design of energy efficient, slow-speed shipping.

The anticipated starting date is 1 April to 1 August 2011.

Project Description
With fuel prices, emissions standards and environmental regulations expected to increase dramatically over the next twenty to fifty years, the shipping industry is strongly motivated to develop substantially more energy efficient ships than those in use today. The recipe for efficient shipping is a combination of ultra-slow speed and complimentary propulsion technologies. When the speed and installed power of a ship is reduced however, the added resistance due to wave-induced motions becomes relatively more important.

Added resistance in waves is a difficult quantity to predict (and even to measure). Existing methods for predicting added resistance are either based on 2D strip-type methods or on 3D boundary-integral equation (panel) methods. The 2D methods tend to work well for high-speed, slender ships, while 3D methods are typically better with fuller-form and slow-speed ships. The 3D methods are however much more computationally intensive and can be sensitive to the smoothness of the hull discretization. Convergence of 3D calculations of added resistance has so far been difficult to demonstrate.

The goal of this PhD project is to increase the reliability of 3D methods for predicting the added resistance of a full-form, slow-speed ship in waves. An existing wave-structure interaction solver based on high-order finite differences on multiple overlapping boundary-fitted blocks will be extended and used to estimate the added resistance of several ultra-slow speed concept designs. These predictions will be compared to those obtained by existing 2D and 3D methods.

Candidates should have a master's degree in Mechanical/Ocean Engineering or a similar degree with an academic level equivalent to the master's degree in engineering. Strong skills in scientific computing, fluid mechanics, applied mathematics and programming in C/C++/Fortran/Matlab/Linux are required, as well as a keen interest in ships, wave-structure interaction and the associated physical processes. Documented knowledge and experience within hydrodynamics, linear and nonlinear ship motion theories and numerical solution of potential flow free-surface problems will be considered as an advantage.

Approval and Enrollment
The scholarships for the PhD degree are subject to academic approval, and the candidates will be enrolled in one of the general degree programs of DTU. For information about the general requirements for enrollment and the general planning of the scholarship studies, please see the DTU PhD Guide.

Salary and appointment terms
The salary and appointment terms are consistent with the current rules for PhD degree students. The period of employment is 3 years.

Further informationFurther information may be obtained from Harry Bingham, tel: +45 4525 1972.

You can read more about DTU Mechanical Engineering at www.mek.dtu.dk.

We must have your online application by Sunday May 1. The application should be no more than 2 pages long and you must indicate how your background has prepared you to carry out this project and why it is of interest to you.

Please open the link "apply for this job online" and fill in the online application form and attach your application, CV and information about academic grades.

All interested candidates irrespective of age, gender, race, religion or ethnic background are encouraged to apply.
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