5aEA11. The radiated noise from realistic airfoils encountering vortical gusts.
Session: Friday Morning, June 20
Author: David P. Lockard Location: Dept. of Aerosp. Eng., Penn State Univ., 233 Hammond Bldg., University Park, PA 16802 Author: Philip J. Morris Location: Dept. of Aerosp. Eng., Penn State Univ., 233 Hammond Bldg., University Park, PA 16802
The long-term objective of the current research is to use computational
aeroacoustics (CAA) methodology and parallel computers to increase the
understanding of broadband blade noise. In a previous paper by the authors [D.
P. Lockard and P. J. Morris, AIAA-97-0286 (1997)] the effect of thickness on the
sound radiated by airfoils encountering incompressible, vortical gusts was
investigated. This work extends those calculations by examining the effect of
camber on the radiated noise. A two-dimensional, Navier-Stokes code, implemented
using the message passing library and FORTRAN 90 on the IBM SP2, is used
to perform the calculations. The code uses Runge-Kutta time integration and
seven-point, central-difference, dispersion-relation-preserving spatial
operators. A multigrid method is used to obtain converged steady-state solutions
before the gust is introduced in a source region inside the domain. [Work
supported by NASA Langley Research Center.]