PhD candidate in marine hydrodynamics related to the subject, effects of waves and current loading with NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY – NTNU

About the job

In an effort to avoid sea lice contamination and reduce the environmental footprint of fish farming, closed fish containment systems (enclosed cages) have been developed and installed at several locations in Norway. Although more relevant for sheltered locations, exposure to waves and currents should always be considered. The common point of the various concepts is the presence of a free surface inside the enclosure, generally covering a large part of the surface of the water body of the structure. The restricted free surface means that sloshing will occur when the cage is set in motion, for example due to exposure to external waves. Sloshing has a significant influence on structural responses and mooring loads, as documented in several research projects. Despite several studies, closed cages are still considered new structures.

Previous relevant closed cage studies have focused on a single cage. In this work, the candidate will consider several closed cages in a network. A significant hydrodynamic interaction is to be expected, both due to the scattering of the waves from each cage, but also due to the wake of each cage. The goal is to identify if there are any important interaction effects that need to be considered in the design of closed cage culture. Closed cages are generally grouped according to their structural characteristics into rigid, semi-rigid (elastic) or fully flexible (membrane) structures. The hydroelastic effects of sloshing for semi-rigid and flexible cage structures have been considered in several projects. A disadvantage of non-rigid cages is that there are more periods of natural sloshing that can be excited by the structure. In the present study, the focus will be limited to the examination of rigid, almost rigid cages.

Research tasks include, but are not limited to:

  • Investigation of potential flow theory models for wave-current interaction on floating bodies and hydrodynamic interaction between cages in a network of cages. Rigid cages will be considered, so hydroelastic effects can be neglected
  • Development of a time-domain simulation model based on potential flow theory for the wave-current interaction in the case of low current velocity (no flow separation)
  • Investigate the importance of flow separation, both with respect to loads on each cage directly and wake effects and attempt to account for this rationally
  • Experimental study with scale models of cages closed in waves

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

The objective is a complete doctoral training until obtaining a doctorate.

You will report to the supervising professor and the department head.

Job duties

  • Participate in the mandatory doctoral research training program
  • Conduct independent research as described above and publish the results in recognized scientific journals, in cooperation with your thesis supervisors
  • Participate and present your work at project meetings as needed

Selection criteria required

  • You must have relevant professional training in marine technology, applied mathematics or a similar field
  • Your education must correspond to a five-year Norwegian study program, 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 program, or equivalent education, equal to B or better on the NTNU grading scale. If you don’t have letter grades from previous studies, you must have an equally good academic foundation. If you have a weaker educational background, you can be assessed if you can prove that you are particularly suitable for doctoral training.
  • You must meet the admission requirements for the doctoral program of the Faculty of Engineering
  • Very good written and oral communication skills in English

The appointment must be made in accordance with the regulations in force concerning employees and civil servants of the State and the regulations concerning the degrees of Philosophiae Doctor (PhD) and Philosodophiae Doctor (PhD) in artistic research National guidelines for the appointment as PhD, post doctor and research assistant

Preferred Selection Criteria

  • Computer programming skills
  • Norwegian skills

Personal characteristics

  • Good collaboration skills
  • Structured, focused and solution-oriented
  • Curious and persevering in research
  • Autonomous with a strong ability to work independently when required

We offer

Salary and conditions

Doctoral students are paid according to code 1017, and are normally paid the gross amount of NOK 491,200 per year before tax, depending on qualifications and seniority. From the salary, 2% is deducted as a contribution to the Norwegian civil service pension fund.

The term of appointment is 3 years, starting in August 2022, no later than September 1, 2022.

Appointment to a doctoral position requires you to be admitted to NTNU’s Doctor of Engineering program (see and studies/ phiv) within three months of employment, and that you are participating in an organized doctoral program during the period of employment.

The engagement must be carried out in accordance with the regulations in force concerning employees and civil servants of the State and the laws relating to the control of the export of strategic goods, services and technologies. Applicants who, after evaluation of the application and attachment, are found to conflict with the criteria of the latter Act will be barred from recruitment at NTNU. After the appointment, you should assume that there may be changes in the working area.

This is a prerequisite for being present and accessible to the establishment on a daily basis.

About the application

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

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

The request must include:

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

If all or part of your training was taken abroad, we also ask you to attach documentation on the extent and quality of all of your training, both bachelor’s and master’s, in addition to other graduate studies. The description of the required documentation can be found here. If you already have a statement from NOKUT, please attach it as well.

If applicable, you can include academic works – published or not – that you wish to be taken into account in the assessment (up to 5 works).

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

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

NTNU is committed to following criteria for research quality assessment in accordance with the San Francisco Declaration on Research Assessment – DORA.

general informations

Working at NTNU

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

The city of Trondheim is a modern European city with a rich cultural scene. Trondheim is Norway’s innovation capital with a population of 200,000. The Norwegian welfare state, including health care, schools, kindergartens and general equality, is probably the best of its kind in the world. Subsidized professional day care for children is easily accessible. Additionally, Trondheim offers great educational opportunities (including international schools) and opportunities to enjoy nature, culture and family life and has a low crime rate and clean air. own.

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

According to the Public Information Act (Offentleglova), your name, age, function and municipality may be made public even if you have requested that your name not be included in the list of candidates.

If you have any questions about the position, please contact Associate Professor David Kristiansen, Department of Marine Technology, NTNU, Trondheim. Telephone number: +47 97126185. Email: If you have any questions about the recruitment process, please contact Human Resources Consultant Marit Gjersvold, email:

Please submit your application electronically via with your CV, diplomas and certificates. Applications submitted elsewhere will not be considered. The Diploma Supplement must be attached for European Master’s degrees outside Norway. Chinese applicants are required to provide confirmation of master’s degree from China Credentials Verification (CHSI).

If you are invited for an interview, you must include certified copies of transcripts and letters of reference. 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 technologies related to the blue economy: offshore oil and gas extraction, ship technology and equipment industry, fishing and aquaculture. We are also strongly committed to the development of sustainable solutions for offshore renewable energy, coastal infrastructure and marine robotics. Marine technology helps solve major global challenges related to the environment, climate, energy, food and efficient transport. The Department of Marine Technology is one of the eight departments of the Faculty of Engineering.

Deadline April 1, 2022

Employer NTNU – Norwegian University of Science and Technology

Municipality Trondheim

Scope Full time

Duration Temporary

place of service Department of Marine Technology

Jessica C. Bell