Radiation of Sound from Unflanged Cylindrical Ducts

S. I. Hariharan, A. Bayliss

Research output: Contribution to journalArticlepeer-review


Calculations of sound radiated from unflanged cylindrical ducts are presented. The numerical simulation models the problem of an aero-engine inlet. The time dependent linearized Euler equations are solved from a state of rest until a harmonic solution is attained. A fourth order accurate finite difference scheme is used and solutions are obtained from a fully vectorized Cyber-203 computer program. Cases of both plane waves and spin modes are treated. Spin modes model the sound generated by a turbofan engine. Boundary conditions for both plane waves and spin modes are treated. Solutions obtained are compared with experiments conducted at NASA Langley Research Center.
Original languageEnglish
Pages (from-to)285-296
JournalSIAM Journal on Scientific and Statistical Computing
StatePublished - 1985


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