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Drag characteristics of unsteady, perturbed boundary layer flowsA series of time-dependent numerical computations have been performed for the flow of an unsteady boundary layer over an embedded cavity, which is aligned normal to the flow direction. The unsteady flow is the result of the imposition of a Stuart vortex, at the inflow boundary of the computational domain, onto an otherwise unperturbed two-dimensional laminar boundary layer flow. This produces a strongly vortical, but spatially monochromatic, motion at inflow which is allowed to evolve downstream through the time-dependent numerical solution of appropriate conservation equations. As the imposed vortex evolves over the solid boundary, a weaker induced vortical motion is produced and together these perturbing motions interact with the fluid motion in the embedded cavity. An analysis of the pertinent dynamic variables as well as the time-dependent drag characteristics for this type of non-planar geometry is performed; with particular emphasis on the relative contribution of both pressure drag and frictional drag at various times in the evolution process.
Document ID
19850043793
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Gatski, T. B.
(NASA Langley Research Center High-Speed Aerodynamics Div., Hampton, VA, United States)
Date Acquired
August 12, 2013
Publication Date
March 1, 1985
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
AIAA PAPER 85-0551
Accession Number
85A25944
Distribution Limits
Public
Copyright
Other

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