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Saturday, July 11, 2020 | History

3 edition of Stability of an oscillating boundary layer found in the catalog.

Stability of an oscillating boundary layer

Stability of an oscillating boundary layer

  • 144 Want to read
  • 36 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in Washington D.C, [Springfield, Va .
Written in English

    Subjects:
  • Boundary layer.

  • Edition Notes

    StatementV.Ya. Levchenko and A.S. Solov"yev.
    SeriesNASA technical memorandum -- NASA TM-77827., NASA technical memorandum -- 77827.
    ContributionsSolov"yev, A. S., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15396329M

    The laminar–turbulent transition of a forced oscillating boundary layer with a varying pressure gradient is experimentally and numerically investigated for two Strouhal numbers. The data we will use to assess the linear stability of boundary layer flows will, in the majority of cases, be limited to the region of the boundary flow itself. In previous treatments of flow using the Taylor-Goldstein equation it is assumed that there is some point in the flow where a solid boundary exists such that φ= 0.

    Oscillating flows over periodic ripples are of practical as well as scientific interest because of their relevance to beach processes. When either the ripples are sufficiently steep or the amplitude of ambient oscillations large, streamlines of a viscous flow are no Cited by: Stability of Swept-Wing Boundary Layers. Some of my early projects at Texas A&M dealt with the stability of the boundary layer on a swept wing, like those found on most commercial transports. Due to the swept angle of the leading edge, flow on these wings is three-dimensional and the pressure gradient across the wing results in a secondary flow.

    Stability of oscillating wedges and caret wings in hypersonic and supersonic flows. () Stability derivatives of a oscillating wedges in viscous hypersonic flow. Shock/turbulent boundary-layer interaction with wall function boundary by: BLSTA, a boundary layer code for stability analysis (SuDoc NAS ) Unknown Binding – January 1, by Yong-Sun Wie (Author) See all formats and editions Hide other formats and editions. Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Author: Yong-Sun Wie.


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Stability of an oscillating boundary layer Download PDF EPUB FB2

This book discusses as well the experimental studies on the oscillations of the boundary layer wherein the mean flow is affected by the presence of oscillations. The final chapter describes the concept of the stability of turbulent flows found in boundary layers, wakes, and jets.

This book is a valuable resource for physicists, mathematicians, engineers, Book Edition: 1. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

Boundary-layer stability theory [Mack, Leslie M] on *FREE* shipping on qualifying offers. Boundary-layer stability theoryAuthor: Leslie M Mack. A complete unsteady formulation of the stability problem is obtained, and the stability characteristics over an oscillation period are determined from the solution of the problem.

Calculations carried out for an oscillating incompressible boundary layer on a plate showed that the boundary layer flow may be regarded as a locally parallel by: 2. The stability of the two-dimensional flow induced by the transverse oscillation of a cylinder in a viscous fluid is investigated in both the linear and weakly nonlinear regimes.

The major assumption that is made to simplify the problem is that the oscillation frequency is large, in which case an unsteady boundary layer is set up on the by:   The Stability of an oscillating boundary layer book of the two-dimensional flow induced by the tranverse oscillation of a cylinder in a viscous fluid is investigated in both the linear and weakly nonlinear regime.

The major assumption that is made to simplify the problem is that the oscillation frequency is large in which case an unsteady boundary layer is set up on the : P. Hall. Direct Simulation of a Turbulent Oscillating Boundary Layer.

Abstract. The turbulent boundary layer under a freestream velocity that varies sinusoidally in time around a zero mean is considered. The flow has a rich variety of behaviors including strong pressure gradients, inflection points in the velocity profile, and reversal of the shear by: This text is the translation and revision of Schlichting's classic text in boundary layer theory.

The main areas covered are laws of motion for a viscous fluid, laminar boundary layers, transition and turbulence, and turbulent boundary layers. (4) Lack of a reliable transition prediction scheme hampers efforts to accurately predict airfoil surface heat transfer and to cool the blades and vanes in gas turbine engines.

(5) The performance and detection of submarines and torpedoes are significantly influenced by turbulent boundary-layer flows. Journal of Differential Equations() Stability and uniqueness of slowly oscillating periodic solutions to Wright's equation.

Journal of Differential Equations() A Stable Rapidly Oscillating Periodic Solution for an Equation with State-Dependent by: Book Description.

Since Prandtl first suggested it inboundary layer theory has become a fundamental aspect of fluid dynamics. Although a vast literature exists for theoretical and experimental aspects of the theory, for the most part, mathematical studies can be found only in separate, scattered articles.

Stability of the Blasius boundary layer over a heated plate in a temperature-dependent viscosity flow 9 November | Physical Review Fluids, Vol. 3, No. 11 Boundary layer transition experiments with embedded streamwise vorticesCited by: stability mechanisms in boundary layers due to the high dynamic response of the measurement technique, as it was done by Leuckert et al.

[9], for example. Lee and Basu [10] used MHFS to study the unsteady development of the boundary layer on an oscillating. Request PDF | Linear stability analysis of oscillating Ekman boundary layers | The analysed Ekman layer is generated in a fluid layer rotating around.

Atmospheric Boundary Layer SUMMARY: This chapter considers the physics of the lowest portion of the atmosphere, in which we live and breathe. The central processes are wind stirring (mechanical turbulence) and diurnal convection (thermal turbulence). The Lower Atmosphere The lowest portion of the atmosphere is vital to us, for it is where File Size: KB.

Parts 3, 4, and 5 include studies on flow stability and transition, transonic flow, and boundary layer flows and shock waves, respectively. Part 6 is devoted to aerodynamics and gas dynamics. Part 7 examines water waves while Part 8 is devoted to hydrodynamics and hydraulics.

In the Earth's atmosphere, the atmospheric boundary layer is the air layer near the ground affected by diurnal heat, moisture or momentum transfer to or from the surface. On an aircraft wing the boundary layer is the part of the flow close to the wing, where viscous forces distort the surrounding non-viscous flow.

Centrifugal Instability of an Oscillating Boundary Layer A cylinder oscillating transversely in water, producing a "centrifugal instability," as shown by fluorescent dye. As fluid flows over an oscillating cylinder, the liquid closest to the cylinder (boundary layer flow) becomes unstable due to variations in angular momentum.

Hydrodynamic stability of He II periodic boundary layer flows. Abstract. He II periodic boundary layer experiments on the damping of torsional oscillations of a sphere have been re-analyzed based on recent classical stability by: 2. In the stable boundary layer (SBL) it is observed often that turbulence is not continuous in space and time.

This discontinuous, intermittent turbulence causes alternations from the mean evolution of the stratified atmospheric boundary layer, which may result in an oscillatory type of behavior of the near-surface wind speed and by:.

The laminar–turbulent transition of a forced oscillating boundary layer with a varying pressure gradient is experimentally and numerically investigated for two Strouhal numbers. Time-dependent characterization of the natural instability modes is carried out using continuous wavelet analysis of velocity signals.

The periodic evolution of the total growth rates .ow in boundary layers. At vari-ous levels of modeling the featuring physical phenomena will be described. Also, numerical methods to solve the equations of motion in the boundary layer are discussed.

Outside the boundary layer the ow can be File Size: 2MB.The stability of the two-dimensional flow induced by the transverse oscillation of a cylinder in a viscous fluid is investigated in both the linear and weakly nonlinear regime.

The major assumption that is made to simplify the problem is that the oscillation frequency is large in which case an unsteady boundary layer is set up on the : P. Hall.