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Wednesday, July 22, 2020 | History

1 edition of Trailing vortices in stratified fluids found in the catalog.

Trailing vortices in stratified fluids

Turgut Sarpkaya

Trailing vortices in stratified fluids

by Turgut Sarpkaya

  • 128 Want to read
  • 19 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Triangular Wings,
  • Hydrodynamics,
  • Vortex-motion,
  • Aerodynamics,
  • Airplanes,
  • Stratified flow

  • About the Edition

    Experiments were conducted with two Delta wings and a streamlined body with lifting surfaces to investigate the evolution of turbulent trailing vortices in stratified and unstratified water. The vortex trajectories were determined as a function of the relative depth D/b sub o, normalized time V sub o t/b sub o, and the stratification parameter Nb sub o/V sub o. The results have shown that the vortices rise only to a finite height as they gradually demise under the influence of turbulence, sinusoidal instability, and the vortex breakdown. The effect of stratification is to reduce the lifespan of vortices and the maximum height attained by them. Various approximate analyses have been examined and new ones have been proposed to determine the lifespan of the vortices. Finally, an exploratory numerical analysis of the two-dimensional, unsteady laminar vortices has been carried out with encouraging results. (Author)

    Edition Notes

    StatementT. Sarpkaya, S.K. Johnson
    ContributionsNaval Postgraduate School (U.S.), Johnson, S. K.
    The Physical Object
    Paginationiv, 162 p. :
    Number of Pages162
    ID Numbers
    Open LibraryOL25501429M
    OCLC/WorldCa83439872

    THE emergence of coherent flow structures is a well-known feature of quasi-geostrophic or two-dimensional turbulence, and because of their relevance to large-scale geophysical flows the dynamics. This paper presents a model which yields examples of stable vortices in a continuously stratified rotating fluid, thus providing a possible explanation of the observed longevity of oceanic eddies. The model is based on two assumptions. Firstly, the ocean comprises a thin upper (active) layer and a thick lower (passive) one, with large and small vertical gradients of density, respectively.

    The Motion of Aircraft Trailing Vortices T. Maxworthy. T. Maxworthy Comments on the motion of vortex rings and vortex pairs in a stratified atmosphere complete the presentation. Issue Section: Research Papers. J. Fluids Eng (May, ) The Wingtip Vortex of a Dimpled Wing With an Endplate. J. Fluids . The work reported herein is part of a basic research on trailing vortices in stratified and unstratified fluids and was performed during the period 1 January to 30 June The principal investigator is Dr. Turgut Sarpkaya, Distinguished Professor of Mechanical Engineering.

    Visit to get more information about this book, to buy it in print, or to download it as a free PDF. The noisy nature of the signals is obviously due to the trailing and necklace vortices emanating from the sail planes and the sail/body juncture. As in the case of many other studies in stratified fluids, the range of the. This book presents an extensive analysis of the dynamics of discrete and distributed baroclinic vortices in a multi-layer fluid that characterizes the main features of the large and mesoscales dynamics of the atmosphere and the ocean. It widely covers the case of hetonic situations as well as the.


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Trailing vortices in stratified fluids by Turgut Sarpkaya Download PDF EPUB FB2

The wake, which forms behind an aircraft due to its lift, is a pair of horizontal counter-rotating vortices propagating downwards. Depending on the atmospheric conditions, such dipole can persist over a long time or be rapidely destroyed. This vortex pair, in homogeneous fluids, is unstable with respect to three-dimensional : Claire Donnadieu, Jean-Marc Chomaz, Sabine Ortiz.

Instabilities and transient growth of trailing vortices in stratified fluid - NASA/ADS The wake, which forms behind an aircraft due to its lift, is a pair of horizontal counter-rotating vortices propagating downwards. Depending on the atmospheric conditions, such dipole can persist over a long time or be rapidely : Claire Donnadieu, Jean-Marc Chomaz, Sabine Ortiz.

Trailing vortices in homogeneous and density-stratified media 20 April | Journal of Fluid Mechanics, Vol. No. -1 Evolution of aircraft trailing vortices in a stratified fluidCited by:   Experiments were conducted with three delta wings and two rectangular wings to investigate the evolution of trailing vortices in stratified and unstratified water.

The vortex trajectories were determined Trailing vortices in stratified fluids book a function of the normalized time V 0 t / b 0, stratification parameter Nb 0 / V 0 and an effective vortex-core size r e / b 0. The results Cited by: Trailing vortices in homogeneous and density-stratified media 20 April | Journal of Fluid Mechanics, Vol.

No. -1 Evolution of aircraft trailing vortices in a stratified fluidCited by: Trailing vortices in stratified fluids. By Turgut Sarpkaya and S. Johnson. Get PDF (7 MB) Abstract. Experiments were conducted with two Delta wings and a streamlined body with lifting surfaces to investigate the evolution of turbulent trailing vortices in stratified and unstratified water.

Abstract. We investigate the three-dimensional stability of the Kármán vortex street in a stratified and rotating fluid by means of an asymptotic theory for long-vertical wavelength and well-separated vortices. Experimental and numerical results are presented of a laminar vortex ring descending in a linearly stratified fluid.

It is observed that the ring shrinks in size as it penetrates the stratified environment and has nearly disappeared when it comes to a stop. adshelp[at] The ADS is operated by the Smithsonian Astrophysical Observatory under NASA Cooperative Agreement NNX16AC86A. On the motion of laminar wing wakes in a stratified fluid - Volume - Philippe R.

Spalart Book chapters will be unavailable on Saturday 24th August between 8ampm BST. This is for essential maintenance which will provide improved performance going forwards.

Books. Dynamics of The Tropical Atmosphere and Oceans Robert E. Robins, Short-Scale Instabilities in Trailing Wake Vortices in a Stratified Fluid, AIAA Journal, /, 38, 10 3-D Calculations Showing the Effects of Stratification on the Evolution of Trailing Vortices, Computation of Three-Dimensional Complex Flows, /   Now, this vortex may become unstable if we add an axial flow.

A canonical model in this case is the Batchelor vortex. The Batchelor vortex, or q-vortex, corresponds to the superposition of with a Gaussian axial field: (5) U (r) = U 0 ± Δ U e-(r / a) 2.

The flow is controlled by the swirl number: (6) q = Γ 0 2 π a Δ U ≈ V 0 Δ U, where V 0 = max{V}, and by the Reynolds number Re = V. Following Bradshaw’s analogy between rotating and stratified flows, the turbulence within a vortex is analyzed using a new model for stratified entrainment.

At the vortex radius where the tangential velocity is a maximum, the model predicts that the flow is so strongly “stratified” that even the smallest turbulent eddies are incapable of transporting fluid there.

Conclusions We have presented some preliminary results from using large eddy simulation to compute the late wake of a self- propelled body moving at constant speed through a non- stratified and a uniformly stratified fluid at Re = as well as the motion of a pair of counter-rotating vortices in both non-stratified and stably stratified fluids.

The key element of Geophysical Fluid Dynamics—reorganization of potential vorticity (PV) by nonlinear processes—is studied numerically for isolated vortices in a uniform environment. Many theoretical studies and laboratory experiments suggest that axisymmetric vortices with a Gaussian shape are not able to remain circular owing to the growth of small perturbations in the typical parameter.

Wingtip vortices are circular patterns of rotating air left behind a wing as it generates lift. One wingtip vortex trails from the tip of each wing. Wingtip vortices are sometimes named trailing or lift-induced vortices because they also occur at points other than at the wing tips.

Dynamics of Vortex Structures in a Stratified Rotating Fluid. by Jacques Verron,Mikhail A. Sokolovskiy. Atmospheric and Oceanographic Sciences Library (Book 47) Thanks for Sharing. You submitted the following rating and review.

We'll publish them on our site once we've reviewed them. Trailing vortices do not decay by simple diffusion. this means that slow bending waves of a vortex rotate in the same direction as the flow inside the vortex when the fluid is stratified. Download complete PDF book, the ePub book or the Kindle book.

Figures. Tables. References. This chapter covers vorticity and vortices as well as fluid in a rotating frame of reference. a convection-like instability present in a gravitationally-stratified fluid where normal convection is absent but where the gradients of pressure and.

associated with wake vortices in a stratified fluid. Other decay mechanisms include atmospheric turbulence and turbulence generated by the aircraft. The later is probably ary importance, but guarantees some minimal decay when atmospberic conditions are near laminar.

Although turbulence is strongly damped by rotation. Fluid Vortices is a comprehensive, up-to-date, research-level overview covering all salient flows in which fluid vortices play a significant role. The various chapters have been written by specialists from North America, Europe and Asia, making for unsurpassed depth and breadth of coverage.

Topics addressed include fundamental vortex flows. A moving body in a stratified fluid produces groups of upstream and attached internal waves, leading-edge vortices, and a vortex street in the wake past the obstacle, which coexist in the stratified flow as an organic whole and are separated by thin high-gradient interfaces or ligaments.By spin-up or spin-down, columnar vortices are generated in rotating continuously stratified fluids.

The vortices are relatively isolated and retain their identity for O () revolution times.