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The Kirchhoff Formulas for Moving Surfaces in Aeroacoustics - The Subsonic and Supersonic CasesOne of the active areas of computational aeroacoustics is the application of the Kirchhoff formulas to the problems of the rotating machinery noise predictions. The original Kirchhoff formula was derived for a stationary surface. In 1988, Farassat and Myers derived a Kirchhoff Formula obtained originally by Morgans using modem mathematics. These authors gave a formula particularly useful for applications in aeroacoustics. This formula is for a surface moving at subsonic speed. Later in 1995 these authors derived the Kirchhoff formula for a super-sonically moving surface. This technical memorandum presents the viewgraphs of a day long workshop by the author on the derivation of the Kirchhoff formulas. All necessary background mathematics such as differential geometry and multidimensional generalized function theory are discussed in these viewgraphs. Abstraction is kept at minimum level here. These viewgraphs are also suitable for understanding the derivation and obtaining the solutions of the Ffowcs Williams-Hawkings equation. In the first part of this memorandum, some introductory remarks are made on generalized functions, the derivation of the Kirchhoff formulas and the development and validation of Kirchhoff codes. Separate lists of references by Lyrintzis, Long, Strawn and their co-workers are given in this memorandum. This publication is aimed at graduate students, physicists and engineers who are in need of the understanding and applications of the Kirchhoff formulas in acoustics and electromagnetics.
Document ID
19970001733
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Farassat, F. (NASA Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
September 1, 1996
Subject Category
Acoustics
Report/Patent Number
NAS 1.15:110285
NASA-TM-110285
Accession Number
97N11505
Funding Number(s)
PROJECT: RTOP 538-03-12-01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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