Abstract
A method for directly computing acoustic signatures without a wave equation analogy is presented. The governing acoustic equations are derived from the unsteady Euler equations by linearizing about a steady mean flow and by assuming a single frequency disturbance. A pseudo-time variable is introduced, and the entire set of equations is driven to convergence by a point implicit four-stage Runge-Kutta time-marching finite-volume scheme. A new formulation of the farfield causality condition is presented which is based on the modal analysis of the similarity form of the linearized Euler equations. The method has been applied to compute acoustic radiation form compact and non-compact oscillating airfoils in the presence of mean flow, acoustic radiation due to airfoil/gust interactions, acoustic scattering from airfoils, and wave propagation in ducts. Results are compared with known analytical solutions and the results of other investigators where applicable.
Original language | English |
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Pages | 35-40 |
Number of pages | 6 |
State | Published - 1995 |
Event | Proceedings of the 1995 ASME/JSME Fluids Engineering and Laser Anemometry Conference and Exhibition - Hilton Head, SC, USA Duration: Aug 13 1995 → Aug 18 1995 |
Conference
Conference | Proceedings of the 1995 ASME/JSME Fluids Engineering and Laser Anemometry Conference and Exhibition |
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City | Hilton Head, SC, USA |
Period | 08/13/95 → 08/18/95 |