TY - GEN
T1 - Aerodynamic noise prediction for long-span bodies
AU - Seo, J. H.
AU - Chang, K. W.
AU - Moon, Y. J.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - A prediction method for aerodynamic noise from long-span bodies is proposed. The present method is based on the hybrid method, and consists of (i) incompressible large eddy simulation (LES), (ii) linearized perturbed compressible equations (LPCE) for 2D acoustic field at spanwise wave number, kz=0, (iii) 2D Kirchhoff method, Oberai's 3D-correction for spectral acoustic pressure at the far-field, and (iv) estimation of the far-field SPL for a long-span body with considering spanwise coherence function. In the present study, accuracy of the hybrid methods is assessed by considering turbulent flow noise problems for a fundamental aerodynamic body with long span. The nose from a circular cylinder with 30D span at ReD=4.6×104 and M=0.21 is predicted with the present methodology. Aerodynamic and aeroacoustic results are compared with the experimental data. Also, fundamental issues on computations of acoustic field, and estimation methods for SPL will be discussed in conjunction with the proper flow physics.
AB - A prediction method for aerodynamic noise from long-span bodies is proposed. The present method is based on the hybrid method, and consists of (i) incompressible large eddy simulation (LES), (ii) linearized perturbed compressible equations (LPCE) for 2D acoustic field at spanwise wave number, kz=0, (iii) 2D Kirchhoff method, Oberai's 3D-correction for spectral acoustic pressure at the far-field, and (iv) estimation of the far-field SPL for a long-span body with considering spanwise coherence function. In the present study, accuracy of the hybrid methods is assessed by considering turbulent flow noise problems for a fundamental aerodynamic body with long span. The nose from a circular cylinder with 30D span at ReD=4.6×104 and M=0.21 is predicted with the present methodology. Aerodynamic and aeroacoustic results are compared with the experimental data. Also, fundamental issues on computations of acoustic field, and estimation methods for SPL will be discussed in conjunction with the proper flow physics.
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U2 - 10.2514/6.2006-2573
DO - 10.2514/6.2006-2573
M3 - Conference contribution
AN - SCOPUS:33845642592
SN - 1563478099
SN - 9781563478093
T3 - Collection of Technical Papers - 12th AIAA/CEAS Aeroacoustics Conference
SP - 2151
EP - 2166
BT - Collection of Technical Papers - 12th AIAA/CEAS Aeroacoustics Conference
PB - American Institute of Aeronautics and Astronautics Inc.
T2 - 12th AIAA/CEAS Aeroacoustics Conference
Y2 - 8 May 2006 through 10 May 2006
ER -