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Friday, July 24, 2020 | History

4 edition of Free-surface turbulence found in the catalog.

Free-surface turbulence

presented at the 1994 ASME Fluids Engineering Division Summer Meeting, Lake Tahoe, Nevada, June 19-23, 1994

  • 49 Want to read
  • 28 Currently reading

Published by American Society of Mechanical Engineers in New York, N.Y .
Written in English

    Subjects:
  • Turbulence -- Congresses.,
  • Surfaces (Technology) -- Congresses.

  • Edition Notes

    Includes bibliographical references and index.

    Statementsponsored by the Fluids Engineering Division, ASME ; edited by Edwin P. Rood, Joseph Katz.
    SeriesFED ;, vol. 181, FED (Series) ;, v. 181.
    ContributionsRood, Edwin P., Katz, Joseph, 1947-, American Society of Mechanical Engineers. Fluids Engineering Division. Summer Meeting, American Society of Mechanical Engineers. Fluids Engineering Division.
    Classifications
    LC ClassificationsTA357.5.T87 F74 1994
    The Physical Object
    Paginationv, 169 p. :
    Number of Pages169
    ID Numbers
    Open LibraryOL1127678M
    ISBN 100791813649
    LC Control Number94071261
    OCLC/WorldCa30959277

    Abstract. The structure and dynamics of turbulence in the presence of a free surface has been investigated by direct numerical simulations of a low Froude number, temporally growing, round turbulent jet which is issued below and parallel to a clean free : N. Mangiavacchi, R. Gundlapalli, R. Akhavan. Hubert Chanson is the author of several books: "Hydraulic Design of Stepped Cascades, Channels, Weirs and Spillways" (Pergamon, ), "Air Bubble Entrainment in Free-Surface Turbulent Shear Flows" (Academic Press, ), "The Hydraulics of Open Channel Flow: An Introduction" (Butterworth-Heinemann, 1st edition , 2nd editon ), "The.

    Results are presented from a towing-tank experiment of 3D separation and free-surface turbulence to provide detailed documentation of the flow appropriate both for explicating the flow physics and validating computational methods. The model is NACA24 which is a m . “Numerical Investigation of Shear-Flow Free-surface Turbulence and Air Entrainment at Large Froude and Weber Numbers,” Journal of Fluid Mechanics, () (with Yu, X. et al). “Data assimilation method to de-noise and de-filter particle image velocimetry data,” Journal of Fluid Mechanics, () (with.

    An optical method to determine local gas transfer coefficients based on turbulence on the free surface of an open-channel flow would be an improvement over current techniques. Measurements of free-surface turbulence and interfacial mass transfer have been already been conducted in lab-scale reactors with turbulence generated by an oscillating grid. the free surface. The data are elaborated by obtaining the macroturbulence Reynolds tensor, using conditional aver-ages based on free surface–fluctuation statistics. We also compute the two-point correlations of fluid velocity, the micro-scale and the integral scale, the correlation between free surface and the turbulence beneath. A free Cited by:


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Free-surface turbulence Download PDF EPUB FB2

This book develops an analysis of the air entrainment processes in free-surface flows. These flows are investigated as homogeneous mixtures with variable density. Several types of air-water free-surface flows are studied: plunging jet flows, open channel flows, and turbulent water jets discharging into air/5(5).

This book develops an analysis of the air entrainment processes in free-surface flows. These flows are investigated as homogeneous mixtures with variable density. Several types of air-water free-surface flows are studied: plunging jet flows, open channel flows, and turbulent water jets discharging into air.

Free-Surface Turbulence Hardcover – by Edwin P. Rood & Joseph Katz (Author) See all formats and editions Hide other formats and editions. Price New from Author: Edwin P. Rood & Joseph Katz. assuming the balance of a surface tension and a normal component of a viscous stress. Mori[] discussed the free surface flows before the wave breaking took divided the flow into three Free-surface turbulence book the development of the free surface shear layer, the formation of the necklace vortex and the production of unsteady turbulent free surface flow.

Measurements of turbulence beneath a free surface in inherently two-dimensional flows such as the channel flows reported by Komori, et. () and Rashidi and Banerjee (), and the plane surface jet flow reported by Ramberg, et.

() have previously shown that the turbulent fluctuations become anisotropic beneath a free surface. This canonical shear-flow free-surface turbulence problem with the initial profile () has been used in a number of previous studies of weak free-surface turbulence e.g.

Shen et al. ( Shen. Free-surface flow models that determine the free-surface elevation by integration over the vertical are introduced, and used for large-scale applications based on the finite-volume method. Structured and unstructured grids are discussed, and the choice of hydrostatic versus non-hydrostatic models is.

addresses the relation between fully developed turbulence of a flow and the turbulence of its free surface. Our experi-ments are done in a 7 m long and m2 cross-section water channel. Figure 1 shows a schematic picture of the channel, with the arrangement of the optical diag-nostics, and a photograph of the turbulent free by:   Direct numerical simulation (DNS) is used to examine low Froude number free-surface turbulence (FST) over a two-dimensional mean shear flow.

The Navier–Stokes equations are solved using a finite-difference scheme with a grid resolution of separate simulations are conducted to calculate the statistics of the by: The modelling of complex free surface flows over weirs and in the vicinity of bridge piers is presented in a numerical model emulating open channel flow based on the Reynolds Averaged Navier-Stokes (RANS) equations.

The importance of handling the turbulence at the free surface in the case of different flow regimes using an immiscible two-phase RANS Computational Fluid Dynamics (CFD) model is Cited by: 2. Get this from a library. Air bubble entrainment in free-surface turbulent shear flows.

[Hubert Chanson] -- This book develops an analysis of the air entrainment processes in free-surface flows. These flows are investigated as homogeneous mixtures with variable density. Several types of air-water. In other studies of turbulence there are “standard" flows for which experimental measurements have been influential in the development of concepts and semi-empirical models, such as boundary layers, mixing layers and fully turbulent flow near a wall.

Such flows have yet to be defined for free-surface turbulence, though there is one. Get this from a library. Free-surface turbulence: presented at the ASME Fluids Engineering Division Summer Meeting, Lake Tahoe, Nevada, June[Edwin P Rood; Joseph Katz, (Cavitation expert); American Society of Mechanical Engineers.

Fluids Engineering Division. Summer Meeting; American Society of Mechanical Engineers. Fluids Engineering Division.;]. and the free-surface fluctuations made a significant contribution to the surface currents.

Banerjee2 derived the conservation equations for turbulent multiphase flows based on various forms of averag-ing. He discussed the modeling of interfacial transport processes and turbulence modifications in one phase due to the presence of the other.

This paper describes the wide range of free-surface deformations that occur when there is turbulence at the surface, and focuses on turbulence in the denser, liquid, medium.

NUMERICAL INVESTIGATIONS OF TURBULENT FREE SURFACE FLOWS USING LEVEL SET METHOD AND LARGE EDDY SIMULATION By Wusi Yue, Ching-Long Lin, and Virendra C. Patel IIHR Technical Report No. IIHR—Hydroscience & Engineering College of Engineering The University of Iowa Iowa City, Iowa December Mean flow, turbulence, and free-surface location in a canoe chute physical model.

In Wahl TL, Pugh CA, Oberg KA, Vermeyen TB, Wahl TL, Pugh CA, Oberg KA, Vermeyen TB, editors, Hydraulic Measurements and Experimental Methods. Cited by: 2. Turbulence Models and Their Application to Complex Flows, by R. Nichols A very nice book that contains a fairly complete overview of RANS and LES turbulence models.

More than pages long. Also contains chapters on wall functions and transition prediction. We just found this book, but after a quick look it seems very interesting (Jan ). Free Surface Flow: Environmental Fluid Mechanics introduces a wide range of environmental fluid flows, such as water waves, land runoff, channel flow, and effluent discharge.

The book provides systematic analysis tools and basic skills for study fluid mechanics in natural and constructed environmental flows. Turbulence in a free surface W. Goldburg,1 J. Cressman,1 Z. Vo¨ro¨s,1 B.

Eckhardt,2 and J. Schumacher2 1Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 2Fachbereich Physik, Philipps-Universita¨t Marburg, D Marburg, Germany ~Received 6 February ; published 29 May.

We report an experimental and numerical study of turbulent Cited by:. In Egolf introduced the Lagrange-Hamilton description of the free surface of quantum fluid He II. In he obtained his PhD at ETHZ with an innovation award. In the late ’s he invented the Difference-Quotient Turbulence Model (DQTM).Turbulence Modeling Near the Free Surface in an Open Channel Flow [T.

F. Swean Jr] on *FREE* shipping on qualifying offers.The interaction of turbulent vortex rings that approach a clean water surface under various angles is experimentally investigated.

The temporal evolution of the vortex rings with an initial Reynolds number of Re 0 = is characterized by the laminar/turbulent transition and asymptotic relaminarization of the flow.

Using the shadowgraph technique, two major flow cases were identified as a Cited by: