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Weakly nonparallel and curvature effects on stationary crossflow instability: Comparison of results from multiple-scales analysis and parabolized stability equationsA multiple-scales approach is used to approximate the effects of nonparallelism and streamwise surface curvature on the growth of stationary crossflow vortices in incompressible, three-dimesional boundary layers. The results agree with results predicted by solving the parabolized stability equations in regions where the nonparallelism is sufficiently weak. As the nonparallelism increases, the agreement between the two approaches worsens. An attempt has been made to quantify the nonparallelism on flow stability in terms of a nondimensional number that describes the rate of change of the mean flow relative to the disturbance wavelength. We find that the above nondimensional number provides useful information about the adequacy of the multiple-scales approximation for different disturbances for a given flow geometry, but the number does not collapse data for different flow geometries onto a single curve.
Document ID
19960003378
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Singer, Bart A.
(High Technology Corp. Hampton, VA, United States)
Choudhari, Meelan
(High Technology Corp. Hampton, VA, United States)
Li, Fei
(High Technology Corp. Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1995
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NASA-CR-198200
NAS 1.26:198200
Accession Number
96N13387
Funding Number(s)
PROJECT: RTOP 505-59-50-02
CONTRACT_GRANT: NAS1-20059
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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