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Friday, February 7, 2020 | History

3 edition of Large- and small-scale structures and their interactions in an axisymmetric jet found in the catalog.

Large- and small-scale structures and their interactions in an axisymmetric jet

Large- and small-scale structures and their interactions in an axisymmetric jet

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  • 35 Currently reading

Published by U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology in Gaithersburg, MD .
Written in English

    Subjects:
  • Turbulence,
  • Jets -- Fluid dynamics

  • Edition Notes

    Other titlesLarge and small scale structures and their interactions in an axisymmetric jet
    StatementWilliam M. Pitts, Cecilia D. Richards, Mark S. Levenson
    SeriesNISTIR -- 6393
    ContributionsRichards, Cecilia D, Levenson, Mark S, National Institute of Standards and Technology (U.S.)
    The Physical Object
    FormatMicroform
    Paginationvi, 130 p.
    Number of Pages130
    ID Numbers
    Open LibraryOL15270278M

    Liu, C. The latter is determined thanks to a turbulent Prandtl resp. This double cascade was recovered by Borue and Orszag with LES using a hyperviscosity Laplacian raised to a higher order. The perfect two-dimensional motion for a zigzag can be explained by taking the lift force into account.

    Gurka, W. Schultz, Near-wall turbulence statistics and flow structures over three-dimensional roughness in a turbulent channel flow, Journal of Fluid Mechanics Abras, J. Pal and S. Indeed, by quantitatively analysing several models of microtubule growth, we conclude that minus-ends of KMTs have selectively detached and depolymerized from the centrosome. The coupled flow and heat transport mechanism was examined through direct numerical simulation DNS of a channel flow allowing for realistic solid—fluid thermal coupling.

    These observations indicate that the structure starts as an instability wave on the shear layer, the amplitude of which reaches a maximum and then decays gradually downstream. Two kinds of experiments are conducted; Marangoni effect which is caused by a surface quiescent surfactant solution and the other is a concentration distribution of surfactant along upward turbulent bubbly flow in a vertical the bubble surface Magnaudet and Eames, Tidal flow over topography: effect of excursion number on radiated waves and turbulence. Buoyant plumes driven by a source of gas bubbles have had a number of applications. Koehler, A laboratory study of particulate and gaseous emissions from crude oil and crude oil-dispersant contaminated seawater due to breaking waves, Atmospheric Environment


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Large- and small-scale structures and their interactions in an axisymmetric jet book

It assumes time-scale separation between resolved and subgrid scales, and restricts to low-Reynolds numbers. The motivation to study the bubble plume is the demands to improve its performance and its applications.

In the near wake, vortex stretching by fluctuating and mean strain are both responsible for enhancing vorticity. Thin sheets of aligned pusher particles are always unstable, while sheets of aligned puller particles can either be stable immotile particlesor unstable motile particles with a growth rate that is nonmonotonic in the force dipole strength.

Let us call this spatially phase-correlated vorticity the coherent vorticity. Place, Digital holographic microscopy reveals prey-induced changes in swimming behavior of predatory dinoflagellates, Proc.

Joseph Katz (professor)

Thus, vortex rings, rolls, spirals, etc. The Obukhov length, L, is varied among cases by imposing a range of stable buoyancy fluxes at the surface to mimic ground cooling. The last case represents a fully developed turbulent boundary layer and is characterized by i a mean profile of the proper shape and shape factor of about 1.

Sarkar and A. Newbolt, J. For the bubbles in the present regime of interest, vortex shedding is not observed. Surprisingly, a pair of uncoordinated foils with dissimilar kinematics can swim together cohesively—without separating or colliding—due to the interaction of the follower with the wake left by the leader.

Introduction Multiphase flows encompass wide-ranging scales and a variety of phenomena. Many researchers have attempted to infer coherent structure on the basis of correlation of linear momenta or pressure.

Katz, K. O f course, true entrainment i. The evolution of shape results from a complex fluid-solid coupling that tends to produce stereotyped forms, and this morphology offers important clues to the history of a landscape and its development. The reason was not clear but the surrounding liquid motion was an important role as shown in Figure 12 obtained by MOFIA and showing the velocity field around the bubble.

Rapaka and S. It is not difficult now to discover coherent structures in many flow-visualization pictures in a variety of turbulent shear flows taken decades ago.

The first LES grid point at the wall is one wall unit, with a stretching away. For slightly larger Reynolds numbers, both feature a double threaded wake.

Numerical methods are pseudo-spectral in the longitudinal and spanwise directions, and sixth-order compact finite differences in the normal direction. Shelley Physical Review Fluids, 2 Effect of external turbulence on the evolution of a wake in a stratified environment. This way, the researcher can be relieved of many ofthe innumerable constraints of laboratory research.

Conclusions 1. In addition, during an underwater oil-well blow-out, a plume of bubbles, oil droplets and sea water develops; the extent of the damage to marine life depends on whether all the oil rises to the surface or spreads out horizontally at some intermediate depth.

Abstract: Natural sculpting processes such as erosion or dissolution often yield universal shapes that bear no imprint or memory of the initial conditions.The flow and sound fields of a heated axisymmetric pulsating jet have been investigated by direct numerical solution of the compressible Navier-Stokes equations in cylindrical coordinates using highly accurate numerical methods.

Effects of pulsating frequency and amplitude on the flow structure and sound generation have been sylvaindez.com by: 5.

Turbulent Cascades II

As beginning of the transition, both inner and outer shear layers roll up into axisymmetric vortex rings due to Kelvin-Helmholtz instability. The inner primary structures (i.e. from the inner shear layer) are trapped in the free spaces between two consecutive outer structures characterizing the locking phenomenon (see balarac, ).

Further. Ivan Marusic. T: +61 (0)3 E: [email protected] This page, its contents and style, are the responsibility of the author and do not represent the views, policies or opinions of the Melbourne School of Engineering or The University of Melbourne.

AML Publications, Images, and Video. Fast crystallization of rotating membrane proteins N. Oppenheimer, D. B. Stein, and M.

Shelley arXiv, (). Abstract: We examine the interactions between actively rotating proteins moving in a membrane. Experimental evidence suggests that such rotor proteins, like the ATP synthases of the inner mitochondrial membrane, can arrange themselves into.

The Mechanics of Solids and Structures - Hierarchical Modeling and the Finite Element Solution Miguel Luiz Bucalem, Klaus-Jürgen Bathe (auth.) This book presents in one treatise – both – the basic mathematical.

models of solid / structural mechanics and effective finite element. procedures for the solution of these models. The book can be. We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.