Hybrid RANS-LES Modeling of a Strongly Detached Turbulent Flow around a Tandem Cylinders Configuration

  • M. Gual Skopek
  • M. Braza
  • Y. Hoarau
  • F. Thiele
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 117)


The turbulent flow around a generic configuration of a landing gear (’the tandem cylinder’) is simulated and analysed physically at Re = 1.66x105, by means of hybrid RANS-LES turbulence modelling approaches. In the present study, the Delayed Detached Eddy Simulation (DDES) approach has been employed. The DDES-OES modelling has been considered, especially involving turbulence length scale reconsiderations in the statistical part, by means of the Organised Eddy Simulation, (OES), to take into account non-equilibrium turbulence effects. The DDES-k-ω SST model is also considered. The results, obtained by means of two different time steps are compared with experiments carried out at the NASA-Langley Research Centre in the context of ATAAC EU-program in which the tandem cylinders is one of the ‘stepping stones’. In the present study, the benefits of these hybrid approaches have been discussed for capturing the vortex dynamics and frequency modes responsible for aerodynamic noise production in the context of landing gear configurations.


Shear Layer Strouhal Number Acoustic Noise Landing Gear Separate Shear Layer 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • M. Gual Skopek
    • 1
    • 3
  • M. Braza
    • 1
  • Y. Hoarau
    • 2
  • F. Thiele
    • 3
  1. 1.Institut de Mécanique des Fluides de ToulouseToulouseFrance
  2. 2.Institut de Mécanique des Fluides et de Solides de StrasbourgStrasbourgFrance
  3. 3.ISTA Dept.Technical University BerlinBerlinGermany

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