Acoustic radiation due to gust-airfoil and blade-vortex interactions

摘要

An accurate and efficient method for computing acoustic radiation due to gust-airfoil and blade-vortex interactions is developed, In. these types of problems, sound is generated as a result of interaction between the unsteadiness in the flow and the body. The acoustic governing equations are derived by linearizing the compressible unsteady Euler equations about the steady mean flow. From these equations, the frequency domain acoustic equations are obtained assuming a single frequency disturbance. The equations are solved by employing a multi-stage Runge-Kutta finite-volume time-stepping scheme with a fourth-order compact spatial discretization. In the farfield, both the Giles' nonreflecting boundary condition and the Perfectly Matched Layer (PML) absorbing boundary conditions are employed. This report describes the technical approach and shows the results calculated for the interactions. [References: 8]