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Monday, July 20, 2020 | History

2 edition of Influence of large-scale motion on turbulent transport for confined coaxial jets found in the catalog.

Influence of large-scale motion on turbulent transport for confined coaxial jets

David C. Brondum

Influence of large-scale motion on turbulent transport for confined coaxial jets

by David C. Brondum

  • 312 Want to read
  • 3 Currently reading

Published by Lewis Research Center, For sale by the National Technical Information Service in Cleveland, Ohio, [Springfield, Va .
Written in English

    Subjects:
  • Turbulence.,
  • Shear flow.,
  • Vortex-motion.

  • Edition Notes

    Other titlesInfluence of large scale motion on turbulent transport for confined coaxial jets.
    StatementDavid C. Brondum and John C. Bennett.
    SeriesNASA contractor report -- 175035., NASA contractor report -- NASA CR-175035.
    ContributionsBennett, John C., Lewis Research Center., University of Connecticut.
    The Physical Object
    Paginationv. :
    ID Numbers
    Open LibraryOL18049296M

    magnitude estimate for the turbulent diffusion coefficient from solar observations. This means that the turbulent transport co-efficients are therefore drastically simplified and/or adjusted so that the resulting mean-field solutions reproduce the observed propertiesof the large-scale magnetic field. Article number, page 1 of In fluid dynamics, turbulence or turbulent flow is fluid motion characterized by chaotic changes in pressure and flow is in contrast to a laminar flow, which occurs when a fluid flows in parallel layers, with no disruption between those layers.. Turbulence is commonly observed in everyday phenomena such as surf, fast flowing rivers, billowing storm clouds, or smoke from a chimney.

    large scale nonlinear simulations have recently been en-abled by advances in efficient algorithms and by effective utilization of tera-scale massively parallel computers. In the absence of a fundamental, first-principles turbu-lence theory, heuristic, mixing length rules are often uti-lized to estimate size scaling of turbulent transport [3].File Size: 94KB. TURBULENT TRANSPORT CHARACTERISTICS IN A LOW-SPEED BOUNDARY LAYER SUBJECTED TO ADVERSE PRESSURE Alberto Ayala Department of Mechanical and Aerospace Engineering West Virginia University P.O. Box Morgantown, WV Bruce R. White and Dae-Seong Kim Department of Mechanical and Aeronautical Engineering University of California.

    Abstract. The theory of the eddy diffusion of magnetic fields, momentum, and heat in rotating and magnetized fluids is reviewed. Rotation and magnetic fields both produce an anisotropy in the eddy diffusion and decrease the diffusivity by: 2. Turbulence is an irregular motion of the air resulting from eddies and vertical currents. It may be as insignificant as a few annoying bumps or severe enough to momentarily throw an airplane out of control or to cause structural damage. Turbulence is associated with fronts, wind shear, thunderstorms, etc.


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Influence of large-scale motion on turbulent transport for confined coaxial jets by David C. Brondum Download PDF EPUB FB2

Get this from a library. Influence of large-scale motion on turbulent transport for confined coaxial jets. [David C Brondum; John C Bennett; Bernard C Weinberg; H McDonald; University of Connecticut.; Scientific Research Associates.; Lewis Research Center.].

Influence of Secondary Motion in Large-Scale Coherent Structures on the Mass Transport in a Shallow Turbulent Wake Chapter (PDF Available) September with 27 Reads How we measure 'reads'. Experimental and Numerical Study of Confined Coaxial Turbulent Jets Article (PDF Available) in AIAA Journal 27(5) May with Reads How we measure 'reads'.

The small-scale turbulent motion is assumed in the model to be in a state of local equilibrium while the large-scale turbulent motion is determined by a second-order closure model.

Computations are conducted for two kinds of quasi-two-dimensional turbulent shear flow, namely confined jets and mixing layers in shallow waters. It is difficult to discern these motions because the energy content of coherent motion in jets is low (about 10% of the total turbulent kinetic energy) compared to mixing layers (about 20%).

Dimotakis' et al. [80] conclusion that large scale vortical structures dominate the dynamics throughout the flow field of a turbulent jet was based on a Cited by: where V p is the velocity vector; r is the radius vector; and U 1, U 2, U 3 and x 1, x 2, x 3 are the velocity components and the coordinates.

The turbulent flow field is assumed known if the 3n-dimensional probability density f 3n is specified. However, it is actually unfeasible to determine f most cases, the random field can be described adequately by statistical moments of various.

superlayer and the turbulent/non-turbulent interface studied in the present paper. The latter, though still very thin, is a layer of turbulent fluid, and all major changes between the irrotational outer fluid and the relatively uniform, fully turbulent interior fluid occur across this layer.

a significant influence on overall aerodynamic performance [4 - 7]. A wide range of turbulent flow conditions is experienced outdoors, due to the wide range of atmospheric wind-speeds, flight speeds and terrain conditions.

The influence of turbulence on the aerodynamic characteristic of MAV wings and airfoils is still unclear. @article{osti_, title = {Investigations of the Dynamics of Turbulent Transport: Implications for Self Consistent Transport Models, Transport Barrier Formation and Transport Evolution}, author = {Newman, David}, abstractNote = {Turbulent transport is the mechanism by which turbulence moves “stuff”.

This “stuff” can be anything from heat, moisture and pollution in neutral fluids. Simulation of Turbulent Flows object shape and dimension (large scale) and by the motion and evolution of small eddies (small scales) Challenging to compute The flow is dominated by the • All models use the transport equation for the turbulent kinetic energy k.

A multiple-scale model for compressible turbulent flows is proposed in this paper. It is assumed that turbulent eddy shocklets are formed primarily by the "collisions" of large energetic eddies. The extra straining of the large eddy, due to their interactions with shocklets, enhances the energy cascade to File Size: 1MB.

Most ITG turbulent transport theories and models assume small scale fluctuations and con-sequently predict gyro-Bohm scaling. However, in previous full torus gyrokinetic simulations with zonal flowartificiallysuppressed, Bohm-liketransportscaling was observed due to radially elongated turbulent eddies resulting from linear global modes.

The turbulence length scale, is a physical quantity describing the size of the large energy-containing eddies in a turbulent flow. The turbulent length scale is often used to estimate the turbulent properties on the inlets of a CFD simulation.

Since the turbulent length scale is a quantity which is intuitively easy to relate to the physical size of the problem it is easy to guess a.

1 Title: Transition from turbulent to coherent flows in confined three-dimensional active fluids Authors: Kun-Ta Wu1, Jean Bernard Hishamunda1, Daniel T.N. Chen1, Stephen J.

DeCamp1, Ya-Wen Chang2, Alberto Fernández-Nieves2, Seth Fraden1* and Zvonimir Dogic1* Affiliations: 1Department of Physics, Brandeis University, South Street, Waltham, MassachusettsUSA.

TURBULENCE Figure The turbulent energy cascade. According to this theory, the energy zontal motion and the bottom boundary. Friction acts to reduce the velocity from some finite value in the interior of the flow to zero at the bottom, thus creating a vertical shear. Mathematically, if u is the velocity component in one of the hori-File Size: KB.

increases at rate equivalent to the work done by large-scale motion that stretches the bundle. • Viscous dissipation in the smallest eddies converts kinetic energy into thermal energy. • Vortex-stretching cascade process maintains the turbulence and dissipation is approximately equal to the rate of production of turbulent kinetic Size: 2MB.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA title = "Large-scale modes of turbulent channel flow: Transport and structure", abstract = "Turbulent flow in a rectangular channel is investigated to determine the scale and pattern of the eddies that contribute most to the total turbulent kinetic energy and the Reynolds shear by:   The amplification of large-scale motion in a supersonic concave turbulent boundary layer and its impact on the mean and statistical properties.

Large-Scale Energy in Turbulent Boundary Layers: Reynolds-Number and Pressure-Gradient Effects. Influence of pressure gradients and Reynolds number on wall-pressure wavenumber-frequency by: REALISTIC VELOCITY AND TURBULENCE INTENSITY PROFILES AT THE COMBUSTOR-TURBINE INTERACTION (CTI) PLANE IN A NOZZLE GUIDE VANE TEST FACILITY I.

Cresci1, P.T. Ireland1, M. Bacic1, I. Tibbott2, A. Rawlinson2 1Department of Engineering Science, Parks Road, Oxford, UK, OX1 3PJ 2Turbine Systems, Rolls Royce PLC, Derby, UK, DE24 8BJ ABSTRACTFile Size: 7MB. Turbulent flow properties of large-scale vortex systems P.

S. Bernard† Department of Mechanical Engineering, University of Maryland, College Park, MD Communicated by Alexandre J. Chorin, University of California, Berkeley, CA, (received for review April 1, ) Large-scale computations of dynamically interacting vortex tubesCited by: @article{osti_, title = {Turbulent Transport Reduction by Zonal Flows: Massively Parallel Simulations}, author = {Lin, Z and Hahm, T S and Lee, W W and Tang, W M and White, R B}, abstractNote = {The dynamics of turbulence-driven E x B zonal flows has been systematically studied in fully 3-dimensional gyrokinetic simulations of microturbulence in magnetically confined toroidal .Turbulent transport in hydromagnetic flows 3 2.

The need for MFT: a status report Motivation In the astrophysical context, MFT has mainly been applied in order to understand and model the origin of the Sun’s magnetic field and its differential rotation (Ru¨diger and Hollerbach ).Cited by: