Comparison of computational aeroacoustic prediction methods for transonic rotor noise

Kenneth Steven Brentner, Anastasios S. Lyrintzis, Evangelos K. Koutsavdis

Research output: Contribution to journalConference articlepeer-review

8 Scopus citations


This paper compares two methods for predicting transonic rotor noise for helicopters in hover and forward flight. Both methods rely on a computational fluid dynamics (CFD) solution as input to predict the acoustic near and far fields. For this work, the same full-potential rotor code has been used to compute the CFD solution for both acoustic methods. The first method employs the acoustic analogy as embodied in the Ffowcs Williams-Hawkings (FW-H) equation, including the quadrupole term. The second method uses a rotating Kirchhoff formulation. Computed results from both methods are compared with one other and with experimental data for both hover and advancing rotor cases. The results are quite good for all cases tested. The sensitivity of both methods to CFD grid resolution and to the choice of the integration surface/volume is investigated. The computational requirements of both methods are comparable; in both cases these requirements are much less than the requirements for the CFD solution.

Original languageEnglish (US)
Pages (from-to)1103-1114
Number of pages12
JournalAnnual Forum Proceedings - American Helicopter Society
StatePublished - Jan 1 1996
EventProceedings of the 1996 52nd Annual Forum. Part 1 (of 3) - Washington, DC, USA
Duration: Jun 4 1996Jun 6 1996

All Science Journal Classification (ASJC) codes

  • Transportation
  • Aerospace Engineering


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