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  • 1
    Digitale Medien
    Digitale Medien
    The effects of streamwise vortices on transition in the plane channel (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1960-1971 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The effect of streamwise vorticity on the three-dimensional breakdown of two-dimensional Tollmien–Schlichting waves in a plane-channel flow is studied via direct numerical simulation. Streamwise vortices of the strength inherent to most transition experiments are shown to alter the relative importance of the subharmonic and fundamental modes and to explain discrepancies observed between theory, previous computations, and experiments in both the plane channel and in the flat-plate boundary layer. It is shown that without the inclusion of the vortices, the computations support the theory; with inclusion of the vortices, the computations support the experiments. This work demonstrates the importance of combining theory, experiments, and computations in the study of transition in both internal and external applications.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.857521
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  • 2
    Digitale Medien
    Digitale Medien
    Characteristics of a young turbulent spot (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 509-521 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A young turbulent spot develops in a spatially developing direct numerical simulation of an incompressible constant-pressure boundary layer exposed to a strong localized disturbance. The data are analyzed to determine both the gross characteristics of the spot and the substructures that develop inside the spot. The calculations confirm that hairpinlike vortices are added near the trailing edge of the spot. However, the computations also suggest that the importance of large spanwise vorticity structures may have been overestimated by previous experiments. The current simulation data reveal that streamwise vortices are more intense and more numerous. In addition, the streamwise vortices provide at least one route for the entrainment of near-wall fluid into the turbulent spot near the leading edge. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.868804
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  • 3
    Digitale Medien
    Digitale Medien
    A weakly nonlinear theory based explanation for wave interactions in rotating channel flow (1992)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 4 (1992), S. 92-94 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A weakly nonlinear wave-interaction theory is used to explain the decay of linearly unstable oblique waves in rotating channel flow at low Reynolds number. At the low Reynolds number studied, the waves tend to stabilize each other and therefore when no waves are preferentially excited, the linearly most unstable mode reaches a nonlinear amplitude first and causes the stabilization of all competing modes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.858505
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  • 4
    Digitale Medien
    Digitale Medien
    Metamorphosis of a hairpin vortex into a young turbulent spot (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 3724-3736 
    Details
    ISSN: 1089-7666
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Direct numerical simulation was used to study the formation and growth of a hairpin vortex in a flat-plate boundary layer and its later development into a young turbulent spot. Fluid injection through a slit in the wall triggered the initial vortex. The legs of the vortex were stretched into a hairpin shape as it traveled downstream. Multiple hairpin vortex heads developed between the stretched legs. New vortices formed beneath the streamwise-elongated vortex legs. The continued development of additional vortices resulted in the formation of a traveling region of highly disturbed flow with an arrowhead shape similar to that of a turbulent spot.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.868363
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