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Monday, November 16, 2020 | History

3 edition of Unsteady shear disturbances within a two-dimensional stratified flow found in the catalog.

Unsteady shear disturbances within a two-dimensional stratified flow

Unsteady shear disturbances within a two-dimensional stratified flow

  • 187 Want to read
  • 39 Currently reading

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

    Subjects:
  • Shear (Mechanics)

  • Edition Notes

    StatementJeffrey W. Yokota.
    SeriesNASA contractor report -- 189121., NASA contractor report -- NASA CR-189121.
    ContributionsUnited States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination57 p.
    Number of Pages57
    ID Numbers
    Open LibraryOL14689745M

    This book begins with a basic introduction to three major areas of hydrodynamic stability: thermal convection, rotating and curved flows, and parallel shear flows. There follows a comprehensive account of the mathematical theory for parallel shear flows. couette flow shear curve poiseuille flow obtain rayleigh In this paper, a displacement-based unified shear deformation theory is developed for the analysis of shear deformable advanced composite beams and plates. The theory is developed with the inclusion of parabolic (PSDT), trigonometric (TSDT), hyperbolic (HSDT) and exponential (ESDT) shape functions in terms of thickness coordinate to account for. Used to refer to the expanse within the outline of a two-dimensional area or within the outer boundaries of a three-dimensional object. Geometric shapes. Such as circles, triangles and squares. Organic shapes. are irregular, often curving or rounded and seem relaxed and more informal than geometric shapes. Analytical solutions for algebraic growth of disturbances in a stably stratified shear flow. Sharath Jose, Anubhab Roy, Rahul Bale & Rama Govindarajan, Proceedings of the Royal Society A, DOI: /rspa, Caustics and clustering in the vicinity of a vortex. S. Ravichandran and Rama Govindarajan. Physics of Fluids, 27,


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Unsteady shear disturbances within a two-dimensional stratified flow Download PDF EPUB FB2

Get this from a library. Unsteady shear disturbances within a two-dimensional stratified flow. [Jeffrey W Yokota; United States. National Aeronautics and Space Administration.]. Author of Unsteady shear disturbances within a two-dimensional stratified flow, Vorticity dynamics of inviscid shear layers, A diagonally inverted LU implicit multigrid scheme for the 3-D Navier-Stokes equations and a two equation model of turbulence, A diagonally inverted LU implicit multigrid scheme, A nonoscillatory, characteristically convected, finite volume scheme for multidimensional.

Staquet, C. A numerical study of vorticity layers in a two-dimensional stratified shear flow. Meccanica (Special Issue on Vortex Dynamics, ed. Cited by: It presents some extensions to the work described above, particularly for the unsteady flow field and surface pressure fluctuations, and also the initial conclusions from the extension of the investigation to other two-dimensional separation by: Two-dimensional secondary instabilities in a stratijied shear layer 75 (corresponding to the spanwise component of the baroclinic torque, in the Boussinesq approximation) feeds the braid with vorticity.

It follows that vorticity can locally increase beyond its maximum initial value, even if the flow dynamics is two- by: Three-dimensional instability of shear flows with inflection-free velocity profiles in stratified media with a high Prandtl number.

twodimensional disturbances become most unstable. The simplest problem involving instability of a shear flow is the case of a bounded homogeneous flow. This type of flow was first analyzed by Rayleigh () and is sometimes called the Rayleigh instability problem. We consider a two-dimensional homogeneous flow with vertical boundaries at heights z 1 and z 2 such that w′ = 0 at these heights.

Effects of Large Scales Motion in Unstable Stratified Shear Flows Article in Theoretical and Computational Fluid Dynamics 20(4) August with 8 Reads How we measure 'reads'.

@article{osti_, title = {The stability of stratified spatially periodic shear flows at low Péclet number}, author = {Garaud, Pascale and Gallet, Basile and Bischoff, Tobias}, abstractNote = {This work addresses the question of the stability of stratified, spatially periodic shear flows at low Péclet number but high Reynolds number.

Shear instability for stratified hydrostatic flows Article in Communications on Pure and Applied Mathematics 62(2) - February with 59 Reads How we measure 'reads'. Abstract. The additional dimension of time which is incorporated into the two-dimensional steady problems addressed in the earlier chapter allows for solutions that provide information on the time history of the behaviour of the primary scalar or vector : Akpofure E.

Taigbenu. A quasi one-dimensional method and results for steady annular/stratified shear and gravity driven condensing flows Article in International Journal of Heat and Mass Transfer 54(15) Some aspects of dissipation due to viscosity and heat conduction are investigated for a linear two‐dimensional unbounded stratified flow over obstacles.

Under the assumption of hydrostatics and small dissipation, an explicit formula for calculating the flow field in the vicinity of the obstacles is given, which is essentially nondissipative. Far above the obstacles, an asymptotic expression Cited by: 1. The near wake of a blunt-base cylinder at 10° angle-of-attack to a Mach free-stream flow is visualized at several locations to study unsteady aspects of its structure.

In both side-view and end-view images, the shear layer flapping grows monotonically as the shear layer develops, similar to the trends seen in a corresponding axisymmetric Cited by: 4.

The paper presents accurate numerical solutions of the full two-dimensional governing equations for steady and unsteady laminar/laminar internal condensing flows. The results relate to issues of better design and integration of condenser-sections Cited by: Three-Dimensional Unsteady Flow With Heat and iass Transfer Over a Continuous Stretching Surface A numerical solution of the unsteady boundary layer equations under similarity assumptions is obtained.

The solution represents the three-dimensional unsteady fluid motion caused by the time-dependent stretching of aflat boundary. Experimental conditions were selected so all cells experienced a similar shear exposure regardless of their position within the chamber.

Unsteady flow with maximum shears of s-1 and s-1 and an average absolute shear of 4 s-1, comparable with levels found at the ocean surface on a windy day, resulted in higher levels of growth inhibition. Examples of hydrodynamic phenomena, most likely to be encountered in various parts of a submerged body, include flow about the bow planes; three-dimensional flow at the body/bow-plane junction; three-dimensional, unsteady and severely-separated flow in the vicinity of torpedo-tube-ports; interaction of flow with devices and unconventional aft.

The flow in the unobstructed space between a pair of disks corotating at high speed in a fixed cylindrical enclosure can be divided into five regions amenable to theoretical analysis [C.

Schuler, Ph.D. Thesis, University of California at Berkeley (); C. Schuler et al., Phys. Fluids A 2, ()].One of these, region III in Fig. 2, is an axially‐aligned detached shear layer Cited by: In this paper, we propose a novel framework to extract features such as vortex cores and saddle points in two-dimensional unsteady flows.

This feature extraction strategy generalizes critical points of snapshot topology in a Galilean-invariant manner, allows to prioritize features according to their strength and longevity, enables to track the temporal evolution of features, is robust against Cited by: 2.

This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies.

The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and. The base flow consists of an unstable stratified shear layer (Ri(g) ), whose shear and stratification are varied.

The unstable shear layer undergoes a Kelvin-Helmholtz shear instability that develops into billows. 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 coronavirus.

An experimental investigation of steady breaking waves produced by towing fully submerged two-dimensional hydrofoils at constant depth (d), speed (U) and angle of attack is presented. Measurements include the temporal evolution of streamwise and cross-stream profiles of the breakers and flow fields, obtained by particle image velocimetry, in the turbulent zone that rides on the forward face of.

Theoretical and experimental results for unsteady or three-dimensional turbulent boundary layers are reviewed, with particular regard to characteristics which are significant in two-dimensional steady flow.

Unsteady flows are examined for the response of the boundary layer oscillation as a function of reduced frequency, and also for the effect. Finally, from a study of the streamline behavior near a separation point, generalized criteria are derived for separation in two dimensional steady and unsteady compressible flow.

Bibtex entry for this abstract Preferred format for this abstract (see Preferences). Lindzen RS, Barker JW () Instability and wave over-reflection in stably stratified shear flow. J Fluid Mech – CrossRef Google Scholar Liu AK, Benney DJ () The evolution of nonlinear wave trains in stratified shear by: 3.

The papers selected treat the dynamics of stratified or rotating fluids, internal or surface waves, hydrodynamic stability, jets and plumes, flow in porous media, and certain aspects of hydrodynamics in magnetic or electric fields.

in three-dimensional boundary layers and modes on unstable stratified shear layers, and proposed a definition of a generalized Richardson number (this is the parameter which characterizes the stratification of a shear flow) for such centrifugally driven instabilities. The study of Bassom & Otto () used a classical weakly nonlinear.

(4) D. Joseph and T. Liao. Potential Flow of Viscous and Viscoelastic Fluids, J. Fluid Mech.,Abstract. Potential flows of incompressible fluids admit a pressure (Bernoulli) equation when the divergence of the stress is a gradient as in inviscid fluids, viscous fluids, linear viscoelastic fluids and second-order fluids.

We show that in potential flow without boundary. Dimensional analysis • Scaling - a powerful idea • Similitude • Buckingham Pi theorem • Examples of the power of dimensional analysis • Useful dimensionless quantities and their interpretation Scaling and similitude • Scaling is a notion from physics and engineering that should really be second nature to you as you solve problems:File Size: KB.

Two-Dimensional Design. STUDY. PLAY. abstract shape. a shape that is derived from visual reality, but has been distilled or transformed, reducing its resemblance to the original source.

Achromatic. Refers to works that deal with value or grayscale only, without color. Additive Color. Eur Radiol. Jun;23(6) doi: /s Epub Dec 2. Three-dimensional shear-wave elastography for differentiating benign and malignant breast lesions: comparison with two-dimensional shear-wave by: governed by the two-dimensional linear diffusion PDE (hereafter referred to as the diffusion equation), 2 2 u u t ∂ ∆= ∂, and is modeled by a linear combination of basis functions that are the products of a two-dimensional Fourier sine series in the spatial variables x and y and an exponential function in the temporal variable t.

Advances in Turbulence XII. Lagrangian statistics of two–dimensional turbulence in a square container B. Kadoch, W. Bos, K. Schneider Shear instabilities in Taylor-Couette flow A. Meseguer, F. Mellibovsky, F.

Marques, M. Avila. Particle Tracking Velocimetry in Transitional Plane Couette Flow. Start studying 2 Dimensional Shapes (again). Learn vocabulary, terms, and more with flashcards, games, and other study tools. The Book Review Index, pagelists the books reviewed duringthe author, publisher, and reviewer, and the volume, issue number, and page on which the review appeared.

Novel Method for Calculating Two-Dimensional Blade Vortex Interaction J for Computing Unsteady Flows J Cascade Flow Calculations Using the k-co. Deformation of a droplet in a particulate shear flow. Southern California Symposium on Flow Physics.

OC Hernandez F. H., Rangel, R. (April, ). Effect of Curvature Estimation on the Nonlinear Oscillation of a Viscous Drop within a Volume-Tracking Framework. 7th Southern California Symposium on Flow Physics, Pasadena, CA. A shear stress acts in a two-dimensional field in which the maximum allowable shear stress is denoted by tmar and the major principal stress by Derive, using the geometry ofMohr's circle of stress, expressions for the maximum values of direct stress which may be applied to thexandy planes in terms of the three parameters given above.

"Direction" is something you associate with a "Vector" and Stress IS NOT A Vector. Stress is the measure of "INTERNAL" resistance and NOT something applied from outside. Stress is developed in the material because of rearrangement of atoms / mole.

been mapped in the near wake at Re=30, and compared to two-dimensional splitter plate results for 9/D.A one‐dimensional, unsteady numerical model for the prediction of the vertical distribution of suspended sediment concentration and rate of suspended sediment deposition in water stirred uniformly has been developed.

The model is derived from the convective‐diffusive transport equation and uses a fully implicit, exponential finite difference scheme. The model is unconditionally stable.Chapter 3 Two-Dimensional Problems in Elasticity FIGURE Thin plate under plane stress.

on both faces of the plate. Because the plate is thin, the stress distribution may be very closely approximated by assuming that the foregoing is likewise true through-out the plate.

We shall, as a condition of the problem, take the body force and andFile Size: KB.