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A model of the wall boundary layer for ducted propellersThe objective of the present study is to include a representation of a wall boundary layer in an existing finite element model of the propeller in the wind tunnel environment. The major consideration is that the new formulation should introduce only modest alterations in the numerical model and should still be capable of producing economical predictions of the radiated acoustic field. This is accomplished by using a stepped approximation in which the velocity profile is piecewise constant in layers. In the limit of infinitesimally thin layers, the velocity profile of the stepped approximation coincides with that of the continuous profile. The approach described here could also be useful in modeling the boundary layer in other duct applications, particularly in the computation of the radiated acoustic field for sources contained in a duct.
Document ID
19880029351
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Eversman, Walter
(Missouri-Rolla, University Rolla, United States)
Moehring, Willi
(Max-Planck-Institut fuer Stroemungsforschung Goettingen, Federal Republic of Germany, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1987
Subject Category
Acoustics
Report/Patent Number
AIAA PAPER 87-2742
Accession Number
88A16578
Funding Number(s)
CONTRACT_GRANT: NAG3-178
Distribution Limits
Public
Copyright
Other

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