GLTRS--Glenn
TITLE AND SUBTITLE:
Fourth Computational Aeroacoustics (CAA) Workshop on Benchmark Problems

AUTHOR(S):
Milo D. Dahl, editor

REPORT DATE:
September 2004

FUNDING NUMBERS:
WBS-22-781-30-09

PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
John H. Glenn Research Center at Lewis Field
Cleveland, Ohio 44135-3191

PERFORMING ORGANIZATION REPORT NUMBER:
E-14393

SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES):
National Aeronautics and Space Administration
Washington, DC 20546-0001

REPORT TYPE AND DATES COVERED:
Conference Publication

SPONSORING/MONITORING AGENCY REPORT NUMBER:
NASA CP-2004-212954

SUPPLEMENTARY NOTES:
Proceedings from the Fourth Computational Aeroacoustics (CAA) Workshop on Benchmark Problems cosponsored by the Ohio Aerospace Institute, AeroAcoustics Research Consortium, and NASA Glenn Research Center, Brook Park, Ohio, October 20-22, 2003. These proceedings are available on CD-ROM in the PDF document format. In addition, the CD-ROM contains information related to all 5 categories of the benchmark problems including the numerical results from the calculations of the analytical and numerical solutions and the experimental data. See the README file in the CD-ROM directory entitled "caawksp4data" for further details. Responsible person, Milo D. Dahl, organization code 5940, 216-433-3578.

ABSTRACT:
The proceedings of the Fourth Computational Aeroacoustics (CAA) Workshop on Benchmark Problems cosponsored by the Ohio Aerospace Institute, AeroAcoustics Research Consortium, and the NASA Glenn Research Center are the subject of this report. As in previous workshops, the problems in this workshop were devised to gauge the technological advancement of computational techniques relevant to CAA. These proceedings show the technical progress achieved from the basic challenges to accurate CAA calculations to the solution of CAA problems of increasing complexity and difficulty. Problems were solved in five categories. In three of the five categories, exact solutions were available for comparison to CAA results. A fourth category representing the sound generation by interacting with a gust, a problem relevant to fan noise, had approximate analytical or completely numerical solutions. The fifth category problems had sound generation in a viscous flow. In this case, the CAA results were compared to experimental data.

SUBJECT TERMS:
Aeroacoustics; Numerical methods; Wave propagation; Sound sources; Acoustic boundary conditions

NUMBER OF PAGES:
495

PDF AVAILABLE FROM URL:
2004/CP-2004-212954.pdf ( 71,469 KB )
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