ESTUDIO DE LA AERODINAMICA EXTERIOR DE VEHICULOS MEDIANTE FLUIDODINAMICA COMPUTACIONAL DE ALTA PERFORMANCE

STORTI, MARIO; D'ELÍA, JORGE; FRANCK, GERARDO; NIGRO, NORBERTO

Revista de Física

Dpto Física, Fac. Cs. Exac., Fís. y Natur., Univ. Nac. de Córdoba

Año: 2005 p. 10 - 19

The near-wake structure of the flow around the Ahmed vehicle model is numerically achieved by a time-averaged  procedure of the unsteady flow modeled by the Navier-Stokes  equations with a Large Eddy Simulation (LES) model for the  turbulence. The Reynolds (based on the model length) number  is fixed in 4.25 million.   A viscous and incompressible fluid model of Newtonian type is assumed. A LES technique together with the  Smagorinsky model as Subgrid Scale  Modeling (SGM) and the van Driest near-wall damping is employed. The coherent macro structures in the near-wake are  estimated through the second invariant of the velocity gradient  applied on the time-average flow. A monolithic computational code is employed, which is based on the  finite element method with equal order basis functions (linear) for  pressure and velocity and uses a Streamline Upwind Petrov-Galerkin (SUPG) scheme  combined with a Pressure Stabilizing Petrov-Galerkin (PSPG) one.  Parallel computing on a Beowulf cluster with a domain decomposition technique for solving the algebraic system is used.