Roughness-induced generation of crossflow vortices in three-dimensional boundary layers
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Roughness-induced generation of crossflow vortices in three-dimensional boundary layers

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Published by National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, National Technical Information Service, distributor] in [Washington, D.C.], [Springfield, Va .
Written in English

Subjects:

  • Turbulent boundary layer.,
  • Surface roughness.

Book details:

Edition Notes

Other titlesRoughness induced generation of crossflow vortices in three-dimensional boundary layers.
StatementMeelan Choudhari.
SeriesNASA contractor report -- 4505., NASA contractor report -- NASA CR-4505.
ContributionsUnited States. National Aeronautics and Space Administration. Scientific and Technical Information Program.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL18060779M

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  The receptivity theory of Goldstein and Ruban is extended within the nonasymptotic (quasi-parallel) framework of Zavol'skii et al. to predict the roughness-induced generation of stationary and nonstationary instability waves in three-dimensional, incompressible boundary layers. The influence of acoustic-wave orientation, as well as that of different types of roughness geometries, Cited by: Get this from a library! Roughness-induced generation of crossflow vortices in three-dimensional boundary layers. [Meelan Choudhari; United States. National Aeronautics and Space Administration. Scientific and Technical Information Program.].   Here we investigate stationary crossflow vortices, which arise due to the instability of the three-dimensional boundary layer over a swept wing, focusing on a region near the leading edge where non-parallelism plays a leading-order role in their by: 1. The generation of stationary crossflow vortices on the 45 degree swept NLF (2) airfoil at the Arizona State University Unsteady Wind Tunnel (AIAA Paper No. , ; Ph.D. thesis, Arizona State University, ) is analyzed using a finite Reynolds-number linear receptivity theory. The receptivity theory is based on the locally-parallel flow approximation and also neglects surface.

Choudhari, M. () “Roughness-induced generation of crossflow vortices in three-dimensional boundary layers,” Theoret. Comput. Comput. Fluid Dyn. 6, 1– The laminar breakdown induced by purely travelling crossflow vortices in a three-dimensional flat-plate boundary-layer flow is investigated in detail by means of spatial direct numerical simulations. Choudhari, M. Roughness-induced generation of cross-flow vortices in three-dimensional boundary layers. Theor. Comput. Fluid Dyn. 6, 1. M. Choudhari and C. L. Streett, “Roughness-induced generation of cross-flow vortices in three-dimensional boundary layers,” High Technology Corporation Report No. .

Spatial optimal growth in three-dimensional boundary layers. Journal of Fluid Mechanics, Vol. , Issue., p. 5. Choudhari, M. Roughness-induced generation of crossflow vortices in three-dimensional boundary layers. Receptivity of three-dimensional boundary layers. J. CROUCH; J. CROUCH. Boeing Commercial Airplane Group, Seattle, WA Roughness-induced generation of crossflow vortices in three-dimensional boundary layers. Theoretical and Computational Fluid Dynamics, Vol. 6, No. 1. The current study investigates the unsteady disturbance development in a three-dimensional, high-enthalpy boundary layer on a capsule-like hemispherical geometry with pseudo-random distributed roughness. Direct Numerical Simulations are conducted for a typical reentry scenario at M = 20 where chemical dissociation takes place. Unsteady. Butler, A. & Wu, X. a Stationary crossflow vortices near the leading edge of three-dimensional boundary layers: the role of non-parallelism and excitation by surface roughness. J. Fluid Mech. , 93 – .