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Receptivity of the boundary layer with separation bubble to external sound waves
Author(s) -
Zametaev V.B.,
Kravtsova M.A.
Publication year - 2007
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200701044
Subject(s) - laminar flow , boundary layer , mechanics , flow separation , flow (mathematics) , turbulence , external flow , physics , potential flow , bubble , acoustics , classical mechanics
The receptivity problem of laminar separated two‐dimensional boundary‐layer under influence of external acoustic waves is considered. Basic features of this theory were formulated by Ruban (1984) and then Goldstein (1985), but these investigations were limited by small perturbations of steady parallel flow only. The current paper takes into account essentially nonparallel regimes of base flow, including attached flows, flow with separated bubbles and the base flow at marginal value of parameter. The steady flow near a corner point of profile is of considerable interest and a question naturally arises about the sensitivity of separation bubble inside the boundary layer to external disturbances such as sound waves. Another question arises about the sensitivity of near critical base flow, namely if corner is concave there is a marginal angle which limits existence of such base flow. This fact usually is linked with sudden reconstruction of full flow pattern past a profile. Development of perturbations inside the interaction region may give some answers about the appearance of turbulence. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)