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Numerical Investigations of Turbulent Flow Past a Generic Airship

Authors
  • El Omari, Kamal
  • Schall, Eric
  • Koobus, Bruno
  • Dervieux, Alain
Publication Date
Jan 01, 2006
Source
HAL
Keywords
Language
English
License
Unknown
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Abstract

Turbulent separated flows around an airship-like geometry (a prolate spheroid 6:1) are investigated using three turbulence modelings based on statistical and Large Eddy Simulation (LES) approaches. The turbulence models used in the simulations are a standard high Reynolds $k$-$\varepsilon$ model, a Smagorinsky LES model and a variational multiscale LES one. The flow of interest is characterized by a relatively low Mach number ($Mach =0.15$), an angle of attack set to $20^\circ$ and a Reynolds number fixed to $4´ 10^4$. The three-dimensional compressible Navier-Stokes equations equipped with the previous turbulent models are discretized by a mixed finite element/finite volume method. The simulations show that the primary longitudinal vortex is predicted by the three models, but only the VMS-LES model predicts a secondary vortical flow structure that is observed in experimental studies.

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