flow around the Gripen fighter

Development of Efficient Methods for Aerodynamic Design of Aircrafts

PhD student: Sebastian Arvidson, Saab Aerosystems/Chalmers
Supervisor: Lars Davidson
Co-supervisor: Shia-Hui Peng, FOI/Chalmers
Co-supervisor: Per Weinerfelt, Saab Aerosystems
Sponsors: Vinnova, Saab Aerosystems
Publications: [1-3]
Start of project: September 2009

Today, the traditional way to work with aerodynamic design in aircraft industry is challenged by tougher requirements on shorter through put times, cost effectiveness and rise in product quality. CFD is a very important tool in aircraft design, thus it has to be improved to align with these requirements.

The flow fields analyzed in aircraft industry are often complex. Speed ranges typically from subsonic to supersonic. A wide range of spatial scales as well as time scales are used. Parts of the flow can be highly viscous and turbulent while other parts, more or less, can be inviscous. The need for highly resolved boundary layers and secondary flows in combination with complex geometries gives meshes with a large number of calculation points. Therefore, it is important that the calculation methods are robust and time efficient.

In aircraft design today, the most common way to analyze viscous flows is to use RANS. This, however, implies limitations in many parts of the aircraft envelope, since most of the flows are unsteady and time dependent. For example flight conditions at high angles of attack, buffeting effects over a wing or separation from inlet lips due to aircraft maneuvering.

In order to increase the possibility to efficiently simulate unsteady flows around the aircraft with high accuracy, this project will focus on improving today´s methodology and calculation methods, i.e. improving turbulence modeling, mainly hybrid RANS-LES methods, and numerical algorithms as well as improve the methodology for running and evaluate time dependent CFD-calculations in an industrial environment.


  1. S. Arvidson, S.-H. Peng, L. Davidson
    "Feasibility of Hybrid RANS-LES Modeling of Shock/Boundary-Layer Interaction in a Duct", Progress in Hybrid RANS-LES Modelling, NNFM, 117 pp. 245-256, 2012. View PDF file
  2. Arvidson, S.
    "Assessment and Some Improvements of Hybrid RANS-LES Methods", thesis of Lic. of Engng, Division of Fluid Dynamics, Dept. of Applied Mechanics, Chalmers University of Technology, Göteborg, Sweden, 2013.
    View thesis
  3. S. Arvidson, L. Davidson, S.-H. Peng
    "Hybrid RANS-LES Modeling Using a Low-Reynolds-Number k-omega Based Model", AIAA Science and Technology Forum and Exposition (SciTech 2014), AIAA paper 2014-0225, Maryland, 13-17 January 2014
    View PDF file

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Ingalena Ljungström