Numerical study of low Reynolds number airfoil flows

Olivier Marsden (1) , Thomas Charrel

1 LMFA - Laboratoire de Mecanique des Fluides et d'Acoustique

A numerical study of the flow and acoustic field around low Reynolds number NACA0012 airfoils is presented in this work. Unsteady flow fields are computed by solving the 2D compressible Navier Stokes equations using low-dispersion and low-dissipation optimized finite-difference schemes. The chord based Reynolds number of the airfoil is varied between 5,000 and 50,000, for angles of attack in the range 0 to 7 degrees and for Mach numbers between 0.2 and 0.5. Numerical velocity, wall pressure and far field acoustic results are compared to those of various DNS in the literature. Strouhal number scaling of the vortex shedding in the wake is illustrated, and acoustic scaling of the trailing edge noise as a function of Mach number is examined. Effects of airfoil incidence on far field noise levels and directivity are also presented.

Mots clés: aeroacoustics; airfoil; DNS

Domaines: Acoustique [physics.class-ph]

Olivier Marsden, Thomas Charrel. Numerical study of low Reynolds number airfoil flows. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811264⟩