Aircraft Engine Noise Scattering By Fuselage and Wings: A Computational Approach

The paper presents a time-domain method for computation of sound radiation from aircraft engine sources to the far field. The effects of non-uniform flow around the aircraft and scattering of sound by fuselage and wings are accounted for in the formulation. The approach is based on the discretization of the inviscid flow equations through a collocation form of the discontinuous Galerkin spectral element method. An isoparametric representation of the underlying geometry is used in order to take full advantage of the spectral accuracy of the method. Large-scale computations are made possible by a parallel implementation based on message passing. Results obtained for radiation from an axisymmetric nacelle alone are compared with those obtained when the same nacelle is installed in a generic configuration, with and without a wing.

[1]  Yusuf Oslash,et al.  Parallel Computation of Forward Radiated Noise of Ducted Fans with Acoustic Treatment , 2012 .

[2]  P. Roe.  Approximate Riemann Solvers, Parameter Vectors, and Difference Schemes , 1997 .

[3]  Yusuf Özyörük,et al.  Computation of Sound Radiating from Engine Inlets , 1996 .

[4]  F. Farassat,et al.  Ducted-Fan Engine Acoustic Predictions Using a Navier-Stokes Code , 1998 .

[5]  W. J. Gordon,et al.  Construction of curvilinear co-ordinate systems and applications to mesh generation , 1973 .

[6]  M. Y. Hussaini,et al.  An Analysis of the Discontinuous Galerkin Method for Wave Propagation Problems , 1999 .

[7]  David A. Kopriva,et al.  Dispersion Analysis for Discontinuous Spectral Element Methods , 2000, J. Sci. Comput..

[8]  M. Y. Hussaini,et al.  Discontinuous Spectral Element Approximation of Maxwell’s Equations , 2000 .

[9]  W. Habashi,et al.  2N-Storage Low Dissipation and Dispersion Runge-Kutta Schemes for Computational Acoustics , 1998 .

[10]  Chi-Wang Shu,et al.  TVB Runge-Kutta local projection discontinuous Galerkin finite element method for conservation laws III: one-dimensional systems , 1989 .

[11]  M. Nallasamy.  Computation of Noise Radiation from Fan Inlet and Aft Ducts , 1997 .

[12]  Walter Eversman,et al.  Wave Envelope and Finite Element Approximations for Turbofan Noise Radiation in Flight , 1986 .

[13]  T. G. Sofrin,et al.  Axial Flow Compressor Noise Studies , 1962 .

[14]  M. Y. Hussaini,et al.  Some Remarks on the Accuracy of a Discontinuous Galerkin Method , 2000 .

[15]  T. G. Sofrin,et al.  Modal propagation angles in a cylindrical duct with flow and their relation to sound radiation , 1979 .

[16]  Yusuf Özyörük,et al.  A time-domain implementation of surface acoustic impedance condition with and without flow , 1996 .

[17]  Wagdi G. Habashi,et al.  Multidomain Spectral Computations of Sound Radiation from Ducted Fans , 1999 .

[18]  T. A. Zang,et al.  Spectral methods for fluid dynamics , 1987 .