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3 edition of Molecular study of turbulence in three dimensional cavity flow found in the catalog.

Molecular study of turbulence in three dimensional cavity flow

Donald Greenspan

Molecular study of turbulence in three dimensional cavity flow

by Donald Greenspan

  • 122 Want to read
  • 23 Currently reading

Published by Dept. of Mathematics, University of Texas at Arlington in Arlington .
Written in English

    Subjects:
  • Molecular emission cavity analysis,
  • Turbulence -- Mathematical models,
  • Molecular dynamics -- Mathematical models

  • Edition Notes

    StatementDonald Greenspan.
    SeriesTR -- #339., Technical report (University of Texas at Arlington. Dept. of Mathematics) -- no. 339.
    ContributionsUniversity of Texas at Arlington. Dept. of Mathematics.
    The Physical Object
    Pagination[24] leaves :
    Number of Pages24
    ID Numbers
    Open LibraryOL17596433M
    OCLC/WorldCa45179003

    The present study performs two-dimensional (2-D) and three-dimensional (3- D) simulations of steady turbulent (K-e) flow in bifurcated nozzles, using a finite-element (FIDAP) model, which has been verified previously with water model experiments. For the purpose of improving the transport capability of the mixed transport pump, a new self-made three-stage deep-sea multiphase pump was taken as the research object. Based on the Euler-Euler heterogeneous flow model, liquid (water) and gas (air) are used as the mixed media to study the external characteristics and internal flow identities of the mixed pump under different gas volume.

    In naval hydrodynamics, many computational studies on cavitation have been carried out using incompressible flow solvers. Rhee et al. [] studied cavity inception and shape around a marine and Rhee [] simulated the unsteady cavitating flow around a wedge-shaped cavitator and r et al. [] investigated the natural super-cavitating flow around three-dimensional cavitators. MEB/3/GI 4 Laminar vs. Turbulent Flow Laminar Flow Turbulent Flow The flow is dominated by the 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 object shape and dimension (large scale) Easy to compute.

      Three-Dimensional Experimental Study of Compressibility Effects on Turbulent Free Shear Layers. 3 February | Flow, Turbulence and Combustion, Vol. 83, No. 2. Turbulent molecular mixing in fully-developed planar shear flows. Terence Meyer.   A numerical simulation of three-dimensional flow around rectangular prisms (two dimensional) of different aspect ratios, ranging from to , is conducted at a Reynolds number of 10 5, using large eddy study identifies the influence of aspect ratio on the flow field around prisms and the attendant aerodynamics.


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Molecular study of turbulence in three dimensional cavity flow by Donald Greenspan Download PDF EPUB FB2

Three-dimensional molecular cavity problems are formulated and solved numerically. The fluid considered is water at 15°C.

The turbulent flows generated are characterized by strong cross-currents over the usual primary vortex : Donald Greenspan. Three-dimensional molecular cavity problems are formulated and solved numerically. The fluid considered is water at 15°C. The turbulent flows generated are characterized by strong cross-currents Author: Donald Greenspan.

V=, J=, T = Figure V =J =T = 7. TURBULENT FLOW Recall now that, usually, turbulent flows have two well-defined criteria.

(1) A strong current develops across the usual primary vortex direction [7]. (2) Many small vortices appear and disappear quickly [8]. Molecular Turbulence Figure Author: D. Greenspan. 16 hours ago  The aim of this paper is to investigate the influence of different turbulence models (k−ε, RNG k−ε, and SST k−ω) on the numerical simulation of cavitating flow in thermosensitive fluid.

The filter-based model and density correction method were employed to correct the turbulent viscosity of the three turbulence models.

A study of molecular turbulence throughthe cavity problem for air Article in Mathematical and Computer Modelling 40() August with 7 Reads How we measure 'reads'Author: Donald Greenspan. Three-dimensional molecular cavity problems are formulated and solved numerically.

The fluid considered is water at 15°C. The turbulent flows generated are characterized by strong cross-currents. Previous three-dimensional simulations of the lid-driven cavity flow have reproduced only the most general features of the flow. Improvements to a finite difference code, REBUFFS, have made.

Fig. 11 shows a direct, two-dimensional simulation of the flow in the YZ plane for wallsp J=25 and Δt= at T= The initial data are those for the molecules in the YZ plane in the three-dimensional example described above.

The flow is analyzed using the very same parameters as those used to display Fig. ison of the results in Fig. 5 and those in Fig. To the authors' knowledge this is the first thorough study dealing with an inclined cavity containing a turbulent natural convection flow. Results for the flow struc- tures and temperature distribution have been dis- cussed for all interesting angles of inclination of the cavity.

Experimental study of supersonic flow over cavity with aft wall offset and cavity floor injection. Control of Three-Dimensional Cavity Flow Using Leading-Edge Slot Blowing. turbulent cavity flows. Progress in Aerospace Sciences, Vol. 47, No. We demonstrate how the self-sustained oscillation of a confined jet in a thin cavity can be quantitatively described by a zero-dimensional model of the delay differential equation type with two a priori predicted model constants.

This model describes the three phases in self-sustained oscillations: (i) pressure driven growth of the oscillation, (ii) amplitude limitation by geometry, and (iii. A Three-Dimensional Hybrid LES-Acoustic Analogy Method for Predicting Open-Cavity Noise 28 February | Flow, Turbulence and Combustion, Vol.

79, No. 1 Spectral Multi-Domain Methods for BiGlobal Instability Analysis of Complex Flows over Open Cavity Configurations. Turbulence has also been inferred from direct measurements of power spectra in molecular clouds across a wide range of scales (Heyer & Brunt ).

While turbulence can provide an isotropic pressure to support the cloud against self-gravity, both hydrodynamic and MHD turbulence decay quickly (Stone et al. ; Mac Low ). Thus if clouds are. DeepDyve is the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Yeh, L. Ukeiley, L. Cattafesta, and K. Taira, "Unsteady Control of Supersonic Turbulent Cavity Flow Based on Resolvent Resolution Analysis of Three-Dimensional Turbulent Channel Flow," Japan Society of Mechanical Three-Dimensional Wake Flow," Active Flow Control Conference II, (Springer book chapter.

Within the spiral core zone, a nested zone of spiral flow exists with opposite rotational directions in the inner and outer layers. The flow in a V-shaped stepped spillway is three-dimensional, unlike that in a traditional stepped spillway.

Additionally, the k-ϵ turbulence model was used to study the flow structure of a V-shaped stepped spillway. A schematic illustration of a two dimensional supersonic cavity flow is presented in Fig. 1, where the coordinate origin is located at the cavity leading edge with the horizontal direction of x and the vertical direction of cavity has a length-to-depth ratio (L/D) of 4, and its depth is 5 supersonic incoming flow with Ma> 1 has an initial boundary layer.

In this study, tomographic PIV measurements are deployed to obtain the complex three-dimensional vortical structures generated by the interaction of plasma synthetic jets with a crossflow turbulent boundary layer.

This investigation focuses on the unsteadiness and turbulent characteristics of the flow. At the moderate Reynolds number (Re = ) where the cavity flow is fully laminar, a direct numerical simulation (DNS) is used whereas large-eddy simulation (LES) methodology is adopted to predict the cavity flow at the higher Reynolds number (Re = ).

Large-eddy simulations of a subsonic three-dimensional cavity flow with self-sustaining oscillations are carried out for a Reynolds number based on the length of the cavity equal to 7 ×. Three dimensional, steady, turbulent flow RANS simulations are carried out to study the near flow field characteristics of a particle laden coaxial water jet.

Spherical glass particles of micron diameter are added to the central jet flow at two mass loading ratios of % and %.The three-dimensional characteristics of the unsteady wall-pressure in a low-Mach-number rectangular cavity flow with Rossiter model oscillation 2 August | Experiments in Fluids, Vol.

58, No. 9 Numerical investigation of cavity self-oscillation and noise radiation induced by turbulent flow at non-zero inclination angle.As a three-dimensional hydrofoil is used at moderate velocities, the sides of the attached cavity can be locally suppressed as the flow remains laminar, so roughness elements of μ m were applied at the leading edge (4% chord length) as a turbulence tripping mechanism.

The roughness elements can lead to local streaks of cavitation appearing.