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
    
   
4. "S. Arvidson and S.-H. Peng and L. Davidson", Prediction of Transonic Duct Flow Using a Zonal Hybrid RANS-LES Modeling Approach, Notes on Numerical Fluid Mechanics and Multidisciplinary Design, Vol. 130, pp. 229-242, Editors: S. Girimaji, Fu, W. Haase, S.-H.Peng and D. Schwamborn, Springer Berlin Heidelberg, 2014.
   View PDF file
    
   
5. S. Arvidson, L. Davidson, and S.-H. Peng
   "Hybrid Reynolds-Averaged Navier-Stokes/Large-Eddy Simulation Modeling Based on a Low-Reynolds-Number k-omega Model" AIAA J, Volume 54, Issue 12, pp. 4032-4037, 2016
   Link to publisher
    
   
6. Arvidson, S.
   "Methodologies for RANS-LES interfaces in turbulence-resolving simulations", PhD thesis, Division of Fluid Dynamics, Dept. of Mechanics and Maritime Sciences, Chalmers University of Technology, Göteborg, Sweden, 2017.
   View PDF file of thesis
    
   
7. S. Arvidson, L. Davidson, S.-H. Peng
   "Interface methods for grey-area mitigation in turbulence-resolving hybrid RANS-LES", International Journal of Heat and Fluid Flow Volume 73, October 2018, Pages 236-257