Internship | Development and Application of 2D Unsteady Interacting Boundary Layer Method

Are you interested in solving challenging problems? Would you like to improve your skills in numerical algorithm development and become an expert in Numerical Aerodynamics? TNO Wind Energy Research Group has a challenging offer for you!



Education type

university (wo)


Internship and graduation project

Hours a week

Fulltime – 40


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What will you be doing?

TNO Wind Energy Research Group is currently developing aerodynamic design tools to predict flow around wind turbine blade sections. The approach taken is to split the solution domain into an inner region that represents the viscous boundary layer and an outer region that models the inviscid external flow. For the viscous boundary layer, a 2D unsteady integral boundary layer method is under development while for the outer region a 2D panel method is being developed. Both methods are coupled through a strong unsteady viscous-inviscid interaction method. The choice of the interaction method leads to a set of a non-conservative form of partial differential equations that were discretized with non-conservative discontinuous Galerkin method (DG) in space and Runge-Kutta scheme in time. Furthermore, transition from laminar to turbulent flow conditions is modeled by an unsteady transition model. Examples of the steady version of this method are XFOIL and RFOIL.

The developed method was successfully tested on flow over a flat plate. The application on flow over airfoils revealed that the unsteady approaches used in both interaction scheme and transition model are a first approximation, ad-hoc models which need to be improved. Furthermore, the closure set is kept the same as in the steady version. The aim of this project is to analyze and extend the current implementation of the interacting boundary layer method to be able to simulate a pitching airfoil under unsteady flow conditions. The implementation will be realized using Fortran.

The major steps of the study will consist of the following:
  • Literature study
  • Analyzing and improving unsteady interaction and transition models
  • Analyzing the current laminar and turbulent closure set
  • Implementation in Fortran
  • Verification and validation of the numerical results on selected test cases
  • Report
This MSc thesis project is planned for a period of 9 up to 12 months at TNO Petten.

What do we require of you?

Preferably you have a background in Aerodynamics. You have a basic knowledge of CFD schemes and/or numerical analysis methods. Additionally, basic knowledge of algorithm development and a high-level programming language (preferably Fortran) is necessary for this project.

What can you expect of your work situation?

TNO is an independent research organisation whose expertise and research make an important contribution to the competitiveness of companies and organisations, to the economy and to the quality of society as a whole. Innovation with purpose is what TNO stands for. With 3000 people we develop knowledge not for its own sake but for practical application. To create new products that make life more pleasant and valuable and help companies innovate. To find creative answers to the questions posed by society. We work for a variety of customers: governments, companies, service providers and non-governmental organisations. Working together on new knowledge, better products and clear recommendations for policy and processes. In everything we do, impact is the key. Our product and process innovations and recommendations are only worth something if our customers can use them to boost their competitiveness. 

Your work will be carried out in our Wind Energy department in Petten, with approximately 60 enthusiastic, academic or bachelor professionals who have in-depth knowledge of wind energy technology. Your work at TNO will be supervised by one or two of these Wind Energy experts. Where possible your activities are connected to our projects. These projects can have a research orientation but we also have projects with a strong industrial focus.

What can TNO offer you?

You want to work on the precursor of your career; a work placement gives you an opportunity to take a good look at your prospective future employer. TNO goes a step further. It’s not just looking that interests us; you and your knowledge are essential to our innovation. That’s why we attach a great deal of value to your personal and professional development. You will, of course, be properly supervised during your work placement and be given the scope for you to get the best out of yourself. Naturally, we provide suitable work placement compensation.

Application process

For this vacancy it is required that the AIVD issues a security clearance after conducting a security screening. Please visit for more information the AIVD website.

Has this vacancy sparked your interest?

Then please feel free to apply on this vacancy! For further questions don’t hesitate to contact us.

Contact: Huseyin Ozdemir
Phone number: +31 (0)6-257 14368

Note that applications via email and third party applications are not taken into consideration.


Apply now



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