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Advanced turbulence simulation for aerodynamic application challenges

Activity Code: AAT.2008.1.1.1; AAT.2008.
Coordinator:German Aerospace Center (DLR)


The ATAAC project aims at improvements to Computational Fluid Dynamics (CFD) methods for aerodynamic flows used in today's aeronautical industry. The accuracy of these is limited by insufficient capabilities of the turbulence modelling / simulation approaches available, especially at the high Reynolds numbers typical of real-life flows.
As LES will not be affordable for such flows in the next 4 decades, ATAAC focuses on approaches below the LES level, namely Differential Reynolds Stress Models (DRSM), advanced Unsteady RANS models (URANS), including Scale-Adaptive Simulation (SAS), Wall-Modelled LES, and different hybrid RANS-LES coupling schemes, including the latest versions of DES and Embedded LES.
The resources of the project will be concentrated exclusively on flows for which the current models fail to provide sufficient accuracy, e.g. in stalled flows, high lift applications, swirling flows (delta wings, trailing vortices), buffet etc.
The assessment and improvement process will follow thoroughly conceived roadmaps linking practical goals with corresponding industrial application challenges and with modelling/simulation issues through stepping stones represented by appropriate generic test cases.

The final goals of ATAAC are:

  • to recommend one or at most two best DRSM for conventional RANS and URANS
  • to provide a small set of hybrid RANS-LES and SAS methods that can be used as reference turbulence-resolving approaches in future CFD design tools
  • to formulate clear indications of areas of applicability and uncertainty of the proposed approaches for aerodynamic applications in industrial CFD

Contributing to reliable industrial CFD tools, ATAAC will have a direct impact on the predictive capabilities in design and optimisation, and directly contribute to the development of Greener Aircraft.

Project Details:

Start Date: 01.04.2009
End Date: 31.03.2012
EU Contribution: 3.79 Mio. Euro
Total Costs: 5.65 Mio. Euro
Funding Scheme: Small or medium-scale focused research project
Administrative Contact Person: Michael Schöpe


  • German Aerospace Center (DLR), Germany
  • Chalmers Tekniska Hoegskola AB, Sweden
  • CFS Engineering SA, Switzerland
  • Tsinghua University, China
  • Ansys Germany GmbH, Germany
  • Airbus UK ltd., United Kingdom
  • Numerical Mechanics Applications International SA, Belgium
  • New Technologies and Services LLC, Russian Federation
  • LFK-Lenkflugkörpersysteme GmbH, Germany
  • Rolls-Royce Deutschland ltd. & Co KG, Germany
  • Institut National Polytechnique de Toulouse, France
  • Eurocopter Deutschland GmbH, Germany
  • Office National d'Etudes et de Recherches Aerospatiales, France
  • Dassault Aviation SA, France
  • Totalforsvarets Forskningsinstitut, Sweden
  • Technische Universität Darmstadt, Germany
  • The University of Manchester, United Kingdom
  • Imperial College of Science, Technology and Medicine, United Kingdom
  • Alenia Aeronautica SPA, Italy
  • EADS Deutschland GmbH, Germany
  • Stichting Nationaal Lucht- en Ruimtevaartlaboratorium, Netherlands
  • Technische Universität Berlin, Germany