New Theories on Boundary Layer Transition and Turbulence Formation
نویسندگان
چکیده
منابع مشابه
Effect of free-stream turbulence on boundary layer transition.
This paper is concerned with the transition to turbulence in flat plate boundary layers due to moderately high levels of free-stream turbulence. The turbulence is assumed to be generated by an (idealized) grid and matched asymptotic expansions are used to analyse the resulting flow over a finite thickness flat plate located in the downstream region. The characteristic Reynolds number Rλ based o...
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André Thess∗1, Dmitry Krasnov1, Thomas Boeck1, Egbert Zienicke1, Oleg Zikanov2, Pablo Moresco3, and Thierry Alboussière4 1 Department of Mechanical Engineering, Ilmenau University of Technology, P.O. Box 100565, 98684 Ilmenau, Germany 2 Department of Mechanical Engineering, University of Michigan Dearborn, Dearborn MI 48128-1491, USA 3 School of Physics and Astronomy, The University of Manchest...
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In previous chapters boundary layers were evident as thin layers across which thermal, dynamic, and material properties of a free interior flow make a transition to their boundary values and/or boundary fluxes. In those cases the thinness of the boundary layer was typically a statement of the smallness of the relevant diffusivity; e.g., the depth h of the laminar Ekman boundary layer scales as ...
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A number of simplified dynamical problems is studied in an attempt to clarify some of the mechanisms leading to turbulence and the existing proposals to control this transition. A simplified set of boundary layer equations displays a solution that corresponds to the rolls and streaks instability and exhibits its streamwise localized nature. The effect of random phases as a device to control the...
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Λ-vortex plays a critical role in the boundary layer transition process. In this paper, the mechanism of Λ-shaped rotational core formation is studied by DNS. The Blasius velocity profile is found to be the vorticity resource. The aggregation of vorticity (vortex filaments) is caused by the 2-D T-S wave. The mechanism of clustering of spanwise vorticity by 2-D T-S wave to form vortex tubes is s...
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ژورنال
عنوان ژورنال: Modelling and Simulation in Engineering
سال: 2012
ISSN: 1687-5591,1687-5605
DOI: 10.1155/2012/619419