On the possibility of singularities in the acoustic field of supersonic sources when BEM is applied to a wave equationUsing a time domain method based on the Ffowcs Williams-Hawkings equation, a reliable explanation is provided for the origin of singularities observed in the numerical prediction of supersonic propeller noise. In the last few years Tam and, more recently, Amiet have analyzed the phenomenon from different points of view. The method proposed here offers a clear interpretation of the singularities based on a new description of sources, relating to the behavior of lines where the propeller blade surface exhibit slope discontinuity.
Document ID
19930062808
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
De Bernardis, E. (Italian Aerospace Research Center Capua, Italy)
Farassat, F. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1989
Subject Category
Acoustics
Meeting Information
Meeting: International Symposium on Boundary Element Methods