PhD Candidate within Marine Hydrodynamics Related to the Topic, Wave- and Current Load Effects job with NORWEGIAN UNIVERSITY OF SCIENCE & TECHNOLOGY – NTNU

About the position

With motivation to avoid sea-lice contamination and reducing the environmental footprint of fish farming, closed fish containment systems (closed cages) have been developed and installed at several locations in Norway. Although the most relevant for sheltered locations, wave and current exposure must still be considered. Common for the different concepts is the presence of a free surface inside the containment, typically covering a large fraction of the structure’s water-plane area. The restricted free surface means sloshing will occur when the cage is set into motion, for instance from external wave exposure. Sloshing has a significant influence on the structural responses and mooring loads, as documented in several research projects. Despite several studies, closed cages are still considered novel structures.

Previous relevant studies on closed cages have focused on a single cage. In this work, the candidate will consider several closed cages in an array. One must expect significant hydrodynamic interaction, both due to wave scattering from each cage, but also due to the wake from each cage. The purpose is to identify whether there are important interaction effects that must be considered in design of a closed cage farm. Closed cages are typically grouped based on their structural characteristics as rigid, semi-rigid (elastic) or fully flexible (membrane) structures. Hydroelastic effects of sloshing for the semi-rigid and flexible cage structures have been considered in several projects. A disadvantage with non-rigid cages is that there are more natural sloshing periods that can be excited by the structure. In the present study the focus will be limited to consider stiff, near rigid cages.

Research tasks include, but is not limited to:

  • Investigation of potential flow theory models for wave-current interaction on floating bodies and hydrodynamic interaction between the cages in an array of cages. Rigid cages will be considered, such that hydroelastic effects can be neglected
  • Development of time-domain simulation model based on potential flow theory for wave-current interaction for the case of low current speed (no flow separation)
  • Investigation of the importance of flow separation, both regarding the loads on each cage directly and wake effects and attempt to account for this in a rational manner
  • Experimental study with scaled models of closed cages in waves

The PhD candidate will be part of the SFI Blues, a Center for Research-based Innovation hosted by SINTEF Ocean, funded by the Research Council of Norway. Being part of SFI Blues implies collaboration and frequent communication with research- and industry partners of SFI Blues. Active participation in the research community, including collaboration with other PhD students at the Department of Marine Technology Center is expected.

The goal is a completed doctoral education up to an obtained doctoral degree.

You will report to supervising Professor and Head of Department.

Duties of the position

  • Take part in the PhD research education program
  • Conduct independent research as described above, and publish the results in recognized scientific journals, in cooperation with your PhD supervisors
  • Participate and present your work in project meetings as required

Required selection criteria

  • You must have a professionally relevant background in marine technology, applied mathematics or similar relevant area
  • Your education must correspond to a five-year Norwegian degree programme, where 120 credits are obtained at master’s level
  • You must have a strong academic background from your previous studies and an average grade from the master’s degree program, or equivalent education, which is equal to B or better compared with NTNU’s grading scale. If you do not have letter grades from previous studies, you must have an equally good academic basis. If you have a weaker grade background, you may be assessed if you can document that you are particularly suitable for a PhD education
  • You must meet the requirements for admission to the Faculty of Engineering’s doctoral program
  • Very good skills in written and oral communication in English

The appointment is to be made in accordance with the regulations in force concerning State Employees and Civil Servants and Regulations concerning the degrees of Philosophiae Doctor (PhD) and Philosodophiae Doctor (PhD) in artistic research national guidelines for appointment as PhD, post doctor and research assistant

Preferred selection criteria

  • Skills in computer programming
  • Norwegian language skills

Personal characteristics

  • Good collaboration skills
  • Structured, targeted and solution-oriented
  • Curious and persistent in doing research
  • Self-driven with a strong ability to work independently when required

We offer

Salary and conditions

PhD candidates are remunerated in code 1017, and are normally remunerated at gross from NOK 491 200 per annum before tax, depending on qualifications and seniority. From the salary, 2% is deducted as a contribution to the Norwegian Public Service Pension Fund.

The period of employment is 3 years, with start-up during August 2022, at latest on September 1st, 2022.

Appointment to a PhD position requires that you are admitted to the PhD program in Engineering at NTNU (see and phiv) within three months of employment, and that you participate in an organized PhD program during the employment period.

The engagement is to be made in accordance with the regulations in force concerning State Employees and Civil Servants, and the acts relating to Control of the Export of Strategic Goods, Services and Technology. Candidates who by assessment of the application and attachment are seen to conflict with the criteria in the latter law will be prohibited from recruitment to NTNU. After the appointment you must assume that there may be changes in the area of ​​work.

It is a prerequisite you can be present at and accessible to the institution on a daily basis.

About the application

The application and supporting documentation to be used as the basis for the assessment must be in English.

Publications and other scientific work must follow the application. Please note that applications are only evaluated based on the information available on the application deadline. You should ensure that your application clearly shows how your skills and experience meet the criteria which are set out above.

The application must include:

  • CV, certificates and diplomas
  • Name and address of three referees

If all, or parts, of your education has been taken abroad, we also ask you to attach documentation of the scope and quality of your entire education, both bachelor’s and master’s education, in addition to other higher education. Description of the documentation required can be found here. If you already have a statement from NOKUT, please attach this as well.

If relevant, you may include academic works – published or unpublished – that you would like to be considered in the assessment (up to 5 works).

Joint works will be considered. If it is difficult to identify your contribution to joint works, you must attach a brief description of your participation.

In the evaluation of which candidate is best qualified, emphasis will be placed on education, experience and personal and interpersonal qualities. Motivation, ambitions, and potential will also count in the assessment of the candidates.

NTNU is committed to following evaluation criteria for research quality according to The San Francisco Declaration on Research Assessment – DORA.

General information

Working at NTNU

A good work environment is characterized by diversity. We encourage qualified candidates to apply, regardless of their gender, functional capacity or cultural background.

The city of Trondheim is a modern European city with a rich cultural scene. Trondheim is the innovation capital of Norway with a population of 200,000. The Norwegian welfare state, including healthcare, schools, kindergartens and overall equality, is probably the best of its kind in the world. Professional subsidized day-care for children is easily available. Furthermore, Trondheim offers great opportunities for education (including international schools) and the possibilities to enjoy nature, culture and family life and has low crime rates and clean air quality.

As an employee at NTNU, you must at all times adhere to the changes that the development in the subject entails and the organizational changes that are adopted.

In accordance with The Public Information Act (Offentleglova), your name, age, position and municipality may be made public even if you have requested not to have your name entered on the list of applicants.

If you have any questions about the position, please contact Associate Professor David Kristiansen, Department of Marine Technology, NTNU, Trondheim. Phone number: +47 97126185. E-mail: If you have any questions about the recruitment process, please contact HR Consultant Marit Gjersvold, e-mail:

Please submit your application electronically via with your CV, diplomas and certificates. Applications submitted elsewhere will not be considered. Diploma Supplement is required to attach for European Master Diplomas outside Norway. Chinese applicants are required to provide confirmation of Master Diploma from China Credentials Verification (CHSI).

If you are invited for an interview you must include certified copies of transcripts and reference letters. Please refer to the application number IV-81/22 when applying.

Application deadline: 01.04.2022

NTNU – knowledge for a better world

The Norwegian University of Science and Technology (NTNU) creates knowledge for a better world and solutions that can change everyday life.

Department of Marine Technology

We develop methods and technology related to the blue economy: oil and gas extraction at sea, ship technology and the equipment industry, fisheries and aquaculture. We also have a strong commitment to the development of sustainable solutions for offshore renewable energy, coastal infrastructure, and marine robotics. Marine technology helps to solve major global challenges related to the environment, climate, energy, food and efficient transport. The Department of Marine Technology is one of eight departments in the Faculty of Engineering.

Deadline 1st April 2022
Employer NTNU – Norwegian University of Science and Technology
Municipality Trondheim
Scope Fulltime
Duration Temporary
Place of service Department of Marine Technology


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