Turbulence modeling challenges in airship CFD studies
-
Autores: Kamal El Omari, Eric Schall, Bruno Koobus
, Alain Dervieux
- Localización: VIII Journées Zaragoza-Pau de Mathématiques Appliquées et de Statistiques / coord. por Manuel Pedro Palacios Latasa , David Trujillo, Juan José Torrens Iñigo , Monique Madaune-Tort , María Cruz López de Silanes Busto , Gerardo Sanz Sáiz , 2003, ISBN 84-7733-720-9, págs. 545-554
- Idioma: inglés
- Enlaces
-
Resumen
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-e 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? and a Reynolds number fixed to 4 ? 104. The threedimensional 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.
