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Saturday, August 8, 2020 | History

4 edition of Toward a turbulence constitutive relation for rotating flows found in the catalog.

Toward a turbulence constitutive relation for rotating flows

Toward a turbulence constitutive relation for rotating flows

  • 99 Want to read
  • 36 Currently reading

Published by Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Turbulent flow,
  • Stratified flow,
  • Rotating fluids,
  • Reynolds stress,
  • Turbulence models,
  • Heat flux

  • Edition Notes

    StatementJ.R. Ristorcelli.
    SeriesICASE report -- no. 96-66., NASA contractor report -- 201621., NASA contractor report -- NASA CR-201621.
    ContributionsInstitute for Computer Applications in Science and Engineering.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17834322M
    OCLC/WorldCa38994249

      Turbulent flows are highly intermittent—for example, they exhibit intense bursts of vorticity and strain. Kolmogorov theory1,2 describes such behaviour in Cited by: Direct numerical simulations (DNS) of non-rotating and rotating turbulent channel flow were conducted. The data base obtained from these DNS simulations was used to investigate the prominent coherent structures involved in the turbulence generation cycle. Predictions from three theoretical models concerning the formation and evolution of sublayer streaks, three-dimensional hairpin vortices and Author: Alan S. Hsieh, Sedat Biringen.

    The direction of our research in the area of turbulent and geophysical flows is towards enhanced physical understanding of turbulent flows in various geometries and the effects of rotation and buoyancy on flows. An additional aim is to develop turbulence models. Turbulent wall-bounded flows. We use DNS, LES and experiments to investigate. The Baldwin-Lomax model [Baldwin and Lomax ()] is a two-layer algebraic 0-equation model which gives the eddy viscosity,, as a function of the local boundary layer velocity model is suitable for high-speed flows with thin attached boundary-layers, typically present in aerospace and turbomachinery applications.

    Two equation turbulence models are one of the most common types of turbulence models. Models like the k-epsilon model and the k-omega model have become industry standard models and are commonly used for most types of engineering problems. Two equation turbulence models are also very much still an active area of research and new refined two-equation models are still being developed.   This is true irrespective of whether the axis of rotation is aligned with or normal to the mean flow plane. Consequently, turbulent rotating flow is very difficult to model. This paper attempts to assess the relative merits of three different ways to account for stress anisotropies in a rotating by: 5.


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Toward a turbulence constitutive relation for rotating flows Download PDF EPUB FB2

Include rotating and nonrotating stratified flows, are slowly evolving flows in which the constitutive relation procedures are useful.

A nonlinear non-constant coefficient representation for the rapid-pressure strain covariance appearing in the Reynolds stress and heat flux equations consistent with the geostrophic balance is described.

Single-point turbulence closures, in general, cannot attain a geostrophic balance. This article addresses and resolves the possibility of constitutive relation procedures for single-point second order closures for a specific class of rotating or stratified flows.

Physical situations in which the geostrophic balance is attained are described. Rapidly rotating turbulent flows are frequently in approximate geostrophic balance. Single-point turbulence closures, in general, are not consistent with a geostrophic balance.

This article addresses and resolves the possibility of a constitutive relation for single-point second-order closures for classes of rotating and stratified flows relevant to by: 8. Get this from a library. Toward a turbulence constitutive relation for rotating flows. [J R Ristorcelli; Institute for Computer Applications in Science and Engineering.].

In high-speed turbulent flows questions arise as to what extent compressibility affects turbulence structures, the Reynolds stress-mean velocity (constitutive) relation, and the accompanying processes of heat transfer and by: 2. In rapidly rotating turbulent flows the largest scales of the motion are in approximate geostrophic balance.

Single-point turbulence closures, in general, cannot attain a geostrophic balance. This article addresses and resolves the possibility of constitutive relation procedures for single-point second order closures for a specific class of rotating or stratified : J. Ristorcelli. This book contains contributions by former students, colleagues and friends of Professor John L.

Lumley, on the occasion of his 60th birthday, in recognition of his enormous impact on the advancement of turbulence research. A variety of experimental, computational and theoretical topics, including.

Author: S. Pope,Stephen B. Pope; Publisher: Cambridge University Press ISBN: Category: Science Page: View: DOWNLOAD NOW» This is a graduate text on turbulent flows, an important topic in fluid dynamics.

It is up-to-date, comprehensive, designed for teaching, and is based on a course taught by the author at Cornell University for a number of years. The formally derived "turbulent constitutive relations" become at most approximations (turbulence models) to the turbulent correlations whose validity varies from flow to flow.

Regardless of the existence of turbulent constitutive relations, the formal procedure of deriving constitutive relations developed in continuum mechanics provides an Cited by: The book provides the reader with the necessary background and current state-of-the art in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence.

Justification of the Shallow-Water Limit for a Rigid-Lid Flow with Bottom Topography. Major Results Quasi-linear model of turbulence We have developed a new quasi-linear model of turbulence in collaboration with J.-P. Laval (Lille University) and S.

Nazarenko (Warwick, GB). We have shown that this model allows simple understanding of the small scale intermittency. With J. Mc Williams (UCLA), we have also shown how this model could lead to a stochastic approach of the closure. 3. Compressible Turbulence.- Mach Number Effects on Free and Wall Turbulent Structures in Light of Instability Flow Interactions.- Toward a Constitutive Relation in Compressible Turbulence.- Fluid Dynamics and Noise Emission Associated with Supersonic Jets.- Formulation of the Statistical Equations of Turbulent Flows with Variable Density Rotating turbulent flows through concentric annuli with several radius ratios and rotation numbers were systematically investigated by means of direct numerical simulation (DNS).

In the outer-wall rotation, the flow is stabilized as expected from an existing DNS of an axially rotating pipe flow. Also discussed are: constitutive relation in compressible turbulence, compressible turbulence and shock waves, direct simulation of compressible turbulence in a shear flow, structural genesis in wall-bounded turbulence flows, vortex lattice structure of turbulent shear slows, etiology of shear layer vortices, trilinear coordinates in fluid mechanics.

This book allows readers to tackle the challenges of turbulent flow problems with confidence. It covers the fundamentals of turbulence, various modeling approaches, and experimental studies. The fundamentals section includes isotropic turbulence and anistropic turbulence, turbulent flow dynamics, free shear layers, turbulent boundary layers and s: 1.

Saffman, P. Results of a two-equation model for turbulent flows and development of a relaxation stress model for application to straining and rotating flows. Proc. Project SQUID Workshop on Turbulence in Internal Flows (ed.

Murthy), pp. – Hemisphere. This book contains contributions by former students, colleagues and friends of Professor John L. Lumley, on the occasion of his 60th birthday, in recognition of his enormous impact on the advancement of turbulence research.

A variety of experimental, computational and theoretical topics, including turbulence modeling, direct numerical simulations, compressible turbulence, turbulent shear flows.

There are two recurring themes in astrophysical and geophysical fluid mechanics: waves and turbulence. This book investigates how turbulence responds to rotation, stratification or magnetic fields, identifying common themes, where they exist, as well as the essential differences which inevitably arise between different classes of by: Since the mean vorticity component perpendicular to the rotating axis appears in the wall-normal rotating channel flow, turbulence is found to be more sensitive to the wall-normal rotation, even.

Predictions of a Supersonic Turbulent Flow in a Square Duct. Reynolds-stress and triple-product models applied to flows with rotation and curvature. 10 June Effect of a Nonlinear Constitutive Relation for Turbulence Modeling on Predicting Flow Separation at Wing-Body Juncture of Transonic Commercial Aircraft.A THEORY OF TURBULENCE Part I: Towards Solutions of the Navier-Stokes Equations Trinh, Khanh Tuoc @ Abstract In this visualisation of turbulence the instantaneous local velocity is expressed in terms of four components to capture the development of and interactions between coherent structures in turbulent : Trinh Khanh Tuoc.

We present a parametric space study of the decay of turbulence in rotating flows combining direct numerical simulations, large eddy simulations, and phenomenological theory. Several cases are considered: (1) the effect of varying the characteristic scale of the initial conditions when compared with the size of the box, to mimic “bounded” and “unbounded” flows; (2) the effect of Cited by: