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2 edition of Development of a three-dimensional turbulent duct flow analysis found in the catalog.

Development of a three-dimensional turbulent duct flow analysis

United States. National Aeronautics and Space Administration. Scientific and Technical Information Office

Development of a three-dimensional turbulent duct flow analysis

by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office

  • 261 Want to read
  • 30 Currently reading

Published by National Aeronautics and Space Administraion, Scientific and Technical Information Office., for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

    Subjects:
  • Stratified flow,
  • Turbulence,
  • Navier-Stokes equations,
  • Paraboloid

  • Edition Notes

    StatementP. R. Eiseman ... [et al.], United Technologies Research Center ; prepared for Lewis Research Center
    SeriesNASA contractor report ; NASA CR-3029, NASA contractor report -- NASA CR-3029
    ContributionsEiseman, P. R, United Technologies Research Center, Lewis Research Center
    The Physical Object
    Paginationiii, 113 p. :
    Number of Pages113
    ID Numbers
    Open LibraryOL17978470M

    In reality, the flows encountered in turbines are highly three‐dimensional, viscous, turbulent, and often transonic. These complex flows will not yield to understanding or prediction of their behavior without the application of contemporary and strong modeling techniques, together with an adequate turbulence model, to reveal effects of turbulence phenomenon and its impact on flow Author: Galina Ilieva Ilieva.   Numerical Prediction of Flow, Heat Transfer, Turbulence and Combustion: Selected Works of Professor D. Brian Spalding focuses on the many contributions of Professor Spalding on thermodynamics. This compilation of his works is done to honor the professor on the occasion of his 60th Edition: 1.

      Turbulent flow through 90° pipe bends, for four different curvatures, has been investigated using large eddy simulations. In particular, the origin of the so-called swirl switching phenomenon, which is a large scale oscillation of the flow after the bend, has been studied for different bend curvature ratios. A classification of the phenomenon into a high and a low Cited by: Nowadays, many researchers works in fluid dynamics has been concentrated on determine the suitable turbulent model for better describing the flow structure and heat transfer characteristics in a specific problem, there are a lot of cases which are necessary about designation of an optimized turbulent model. In the present work, a ribbed roughened square duct has been investigated Author: Amin Etminan, H. Jafarizadeh, M. Moosavi, K. Akramian.

    available models used in FLUENT for turbulent heat transfer were carried out in our previous research [] by using simple turbulent flows, e.g., channel flow and single jet impingement. It was found that k- models with standard wall function and the v2f low-. Duct flow nonuniformities study for Space Shuttle main engine technical report / by: Thoenes, Jürgen. Published: () Analysis of internal flows relative to .


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Development of a three-dimensional turbulent duct flow analysis by United States. National Aeronautics and Space Administration. Scientific and Technical Information Office Download PDF EPUB FB2

Development of a three-dimensional turbulent duct flow analysis. [Washington]: National Aeronautics and Space Administration, Scientific and Technical Information Office. Development of a Three-Dimensional Turbulent Duct Flow Analysis P.

Eiseman, R. Levy, H. McDonald, and W. Briley United Technologies Research Center East Hartfbrd, Connecticut Prepared for Lewis Research Center under Contract NAS NASA National Aeronautics and Space Administration Scientific and Technical.

Abstract. A method for computing three-dimensional turbulent subsonic flow in curved ducts is being developed. A set of tube-like surface oriented coordinates is employed for a general class of geometries applicable to subsonic diffusers with offset : Ralph Levy, Henry McDonald, W.

Roger Briley. A Three-Dimensional Turbulent Compressible Subsonic Duct Flow Analysis for Use With Constructed Coordinate Systems R. Levy, H. McDonald, W. Briley, and J. Kreskovsky ScieutiJic Research Associates, Inc. Glastotzbury, Corlnecticut Prepared for Lewis Research Center under Contract NAS National Aeronautics.

Three-dimensional measurements of the mean velocity field have been made in a square-cross-sectional, strongly curved, 90 deg turbulent duct flow. The mean radius to duct width ratio was The study was performed as part of an overall investigation of the physics of endwall convective heat transfer.

The numerical results show well the three dimensional turbulent flow field in the rectangular duct behind the sudden expansion cross-section, and agree fairly well with the experimental result of the length of the main circumfluence.

The numerical method of this paper can be applied to numerical analysis of this kind of turbulent by: 1. Axial development of the mean flow in the entrance region of turbulent pipe and duct flows Article in Comptes Rendus Mecanique (8). Three-dimensional measurements of the mean velocity field have been made in a square-cross-sectional, strongly curved, 90 deg turbulent duct flow.

The mean radius to. In order to study the flow distribution in the inlet duct portion of four pass two ESP configuration connected to two ID fans, IGES file from CAD model has been imported in CFD pre-processor. The geometry of inlet duct with flow control devices shown in Fig(a) is considered to develop the flow pattern inside the duct around flow control Cited by: 2.

Turbulent Three-Dimensional Air Flow and Trace Gas Distribution in an Inhalation Test Chamber P. Longest, The system consisted of an inlet duct with a continuous carbon monoxide point source, and degree bends, a round diffuser, a round-to-square transition, a rectangular diffuser, the test chamber, a perforated floor, and again Cited by: 5.

A finite-difference procedure is employed to predict the development of turbulent flow in curved pipes. The turbulence model used involves the solution of two differential equations, one for the kinetic energy of the turbulence and the other for its dissipation rate.

A calculation procedure is described for three-dimensional duct-flow. Also unlike in turbulent pipe flow, the mean flow near the bottom wavy-wall in a wavy-walled duct is not attached. The values of the Nusselt number at, for fully developed pipe flow is found from Dittus–Boelter correlation to be, andrespectively while the corresponding values for wavy Cited by: 7.

The book consists of two parts followed by a number of appendices. Part I provides a general introduction to turbulent flows, how they behave, how they can be described quantitatively, and the fundamental physical processes involved.

Part II is concerned with different approaches for modelling or simulating turbulent : Stephen B. Pope. This paper reports the outcome of applying two different low-Re number eddy-viscosity models to resolve the complex three-dimensional motion that arises in turbulent flow in a square cross-section duct passing around a 90° bend.

Flow computations have been obtained using a three-dimensional, non-orthogonal flow by: 2. analysis. Laser Doppler velocimetry was mainly employed for validation of the afore-mentioned experimental methods.

The three-dimensional flow field depicting varying vortical patterns has been captured under turbulent steady, swirling and pulsating flow conditions, for parameter values for which experimental evidence has been missing in.

Computational Analysis of Turbulent flow heat transfer and pressure loss in Duct or Pipe with Segmental Baffles turbulent flow in a pipe at higher Reynolds number.

keε A node three-dimensional structural solid element was selected to model Author: Prakash Chand. The principle flow is in the xdirection. Turbulent flow enters - the duct with a uniform velocity and temperature profile. The three-dimensional Navier -Stokes, energy and turbulence equations are used to describe the flow and heat transfer in the computational domains.

The three-dimensional incompressible Newtonian flow with negligible Cited by: 4. @article{osti_, title = {Analysis of the three-dimensional structure of a bubble wake using PIV and Galilean decomposition}, author = {Hassan, Y A and Schmidl, W D and Ortiz-Villafuerte, J and Scharf, J R}, abstractNote = {Bubbly flow plays a key role in a variety of natural and industrial processes.

An accurate and complete description of the phase interactions in. During analysis k-ε turbulence model has been selected and the flow of water within the pipe has been examined.

Moreover, comparative flow analyses between the three pipes have been discussed in detail. Key Words: Turbulent Flow, arbitrary cross sectional pipe 1. INTRODUCTION The study of fluid flow in arbitrary shaped pipe and duct is. A direct numerical simulation of a fully developed, low-Reynolds-number turbulent flow in a square duct is presented.

The numerical scheme employs a time-splitting method to integrate the three-dimensional, incompressible Navier-Stokes equations using spectral/high-order finite-difference discretization on a staggered mesh; the nonlinear terms are represented Cited by:.

coupled with the energy equation. Two and three dimensional turbulent convective heat transfer and flow pattern inside straight, divergent and convergent ducts with square ribs has been carried out for Reynolds number varying from to The impact of .Laminar vs.

Turbulent Flow Laminar Flow Turbulent Flow The flow is dominated by the object shape and dimension (large scale) three-dimensional, time accurate with extremely fine grids. MEB/3/GI 6 correct prediction of the development .Computational fluid dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and data structures to analyze and solve problems that involve fluid ers are used to perform the calculations required to simulate the free-stream flow of the fluid, and the interaction of the fluid (liquids and gases) with surfaces defined by boundary conditions.