Proposed Boundary Conditions for Gust-Airfoil Interaction Noise

Abstract

This paper proposes inflow and outflow boundary conditions for direct computation of airfoil noise under the influence of atmospheric gusts. The proposed boundary conditions are based on the existing zonal sponge technique that has been used mostly to attenuate out� going disturbances and absorb reflections from computational boundaries. A modified form of the sponge technique is presented in this paper in order to enhance the accuracy of acoustic solutions especially in the far field. This type of approach has been unpublished for flows in the presence of a solid body such as an airfoil. The proposed boundary conditions