Results 261 to 270 of about 454,024 (311)
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Oscillating Laminar Boundary Layers and Unsteady Separation
AIAA Journal, 1974Abstract : The unsteady laminar boundary equations are solved numerically for oscillating outer flow velocity distributions. Some characteristic features of oscillating boundary-layers are observed and checked against existing analytical and experimental data.
Tsahalis, D. Th., Telionis, D. P.
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Numerical simulation of separated boundary-layer flow
Journal of Engineering Mathematics, 1997We present numerical simulations of time-dependent two-dimensional compressible boundary layer flow containing a region of separation. The separation is generated by the introduction of an adverse pressure gradient along the freestream boundary. In order to validate the numerical method, a low Mach-number laminar separation bubble flow is considered ...
Wasistho, B. +2 more
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Boundary layer separation in a rotating container
Physics of Fluids, 1996The flow field induced in a cylindrical container by the rotation of the container and/or the end wall(s) about the axis of symmetry is highly vortical. If the container and the end walls are rotated at different angular velocities, a meridional flow develops due to the tilting and stretching of the axial vorticity created by the rotation of the ...
Jahnke, Craig C., Valentine, Daniel T.
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Stability of Laminar Boundary Layers at Separation
The Physics of Fluids, 1967The stability of laminar boundary layers at separation is considered. The velocity distribution is represented by (1) a Pohlhausen fourth-degree polynomial P4, and (2) by a Falkner—Skan similarity profile at separation, Hartree β = − 0. 1988. The Orr—Sommerfeld equation is integrated using Runge—Kutta with Gram—Schmidt orthonormalization.
Wazzan, A. R. +2 more
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2017
AbstractChapter 2 discusses the experimental observations of the boundary-layer separation in subsonic and supersonic flows that lead to a formulation of the concept of viscous-inviscid interaction. It then turns to the so-called ‘self-induced separation’ of the boundary layer in supersonic flows.
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AbstractChapter 2 discusses the experimental observations of the boundary-layer separation in subsonic and supersonic flows that lead to a formulation of the concept of viscous-inviscid interaction. It then turns to the so-called ‘self-induced separation’ of the boundary layer in supersonic flows.
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Instability of separated boundary layers
2012In this chapter we discuss flow instability at laminar boundary-layer separation that can happen on airfoils and wings, in diffusors, at sudden surface variations such as steps and bumps, etc. Within this topic, a good deal of research data is available for local separation regions generated when the separated layer reattaches back to the surface. Such
Andrey V. Boiko +3 more
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Vorticity and Boundary Layer Separation
2021Vorticity represents the underlying skeleton of fluid motion. The spatial distribution of vorticity characterizes the dynamic properties of fluid flow. When vorticity has a regular distribution, like when it is confined in the boundary layer next to the wall, the flow is regular and predictable.
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Supersonic, Turbulent Boundary-Layer Separation
AIAA Journal, 1974Although the requirements for computer time and disk storage are still large, they are orders of magnitude less than what would be required by numerical solution with the differential formulation, so that some time-dependent, three-dimensional solutions can at least be considered within the present state of computer development. The accurate prediction
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Boundary layers and separation
1966We consider two-dimensional stationary viscous incompressible flow past a finite object. It is assumed that for each value of the Reynolds number a solution exists; it is also assumed that if this solution is not unique it is possible in principle to select a solution which varies continuously with Reynolds number.
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Control of a boundary layer separation
PAMM, 2007AbstractThe results of experimental study on a boundary layer separation control are given in the paper. The boundary layer on a flat wall is subjected to adverse pressure gradient. The active control strategy evolving a synthetic jet has been applied. The separation process is investigated using TR‐PIV method.
V. Uruba, M. Knob, L. Popelka
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