NDLI: Boundary-layer receptivity to external disturbances using multiple scales

Content Provider	Springer Nature Link
Author	Zuccher, Simone Luchini, Paolo
Copyright Year	2013
Abstract	Non-homogeneous multiple scales are introduced to solve the resonant problem of non-parallel boundary-layer receptivity originating from the quadratic mixing of environmental disturbances. The resulting algorithm is computationally inexpensive and can be efficiently included in industrial codes for transition prediction. The mutual interactions between acoustic wave, vorticity wave, wall vibration and wall roughness are discussed in detail and the receptivity coefficient, which relates the amplitude of the excited wave to the amplitude of the exciting sources, is computed. The largest effect is found for the interaction between acoustic waves and wall roughness perturbations. Other coupling mechanisms are less effective. By comparing parallel and non-parallel results, it is found that flow non-parallelism can play a non-negligible role even in Blasius’ boundary layer, although the largest effects are evident for the three-dimensional boundary layer over an infinite swept wing. For the particular case of wall roughness—wall vibration mixing, the velocity disturbance is shown to be exactly equal to the velocity perturbation induced by wall roughness alone on a wall vibrating in the normal direction.
Starting Page	441
Ending Page	467
Page Count	27
File Format	PDF
ISSN	00256455
Journal	Meccanica
Volume Number	49
Issue Number	2
e-ISSN	15729648
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-09-14
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Boundary-layer receptivity Boundary-layer stability Flow instabilities Transition to turbulence Multiple scales Receptivity to external disturbances Mechanics Civil Engineering Automotive Engineering Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Mechanical Engineering

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