Compressibility Turbulence and High Speed Flow

Compressibility  Turbulence and High Speed Flow
Author: Thomas B. Gatski,Jean-Paul Bonnet
Publsiher: Academic Press
Total Pages: 342
Release: 2013-03-05
ISBN: 012397318X
Category: Science
Language: EN, FR, DE, ES & NL

Compressibility Turbulence and High Speed Flow Book Excerpt:

Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used. The book provides the reader with the necessary background and current trends in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence. Detailed derivations of the pertinent equations describing the motion of such turbulent flows is provided and an extensive discussion of the various approaches used in predicting both free shear and wall bounded flows is presented. Experimental measurement techniques common to the compressible flow regime are introduced with particular emphasis on the unique challenges presented by high speed flows. Both experimental and numerical simulation work is supplied throughout to provide the reader with an overall perspective of current trends. An introduction to current techniques in compressible turbulent flow analysis An approach that enables engineers to identify and solve complex compressible flow challenges Prediction methodologies, including the Reynolds-averaged Navier Stokes (RANS) method, scale filtered methods and direct numerical simulation (DNS) Current strategies focusing on compressible flow control

Advances in Compressible Turbulent Mixing

Advances in Compressible Turbulent Mixing
Author: Anonim
Publsiher: Unknown
Total Pages: 626
Release: 1992
ISBN: 1928374650XXX
Category: Fluid dynamics
Language: EN, FR, DE, ES & NL

Advances in Compressible Turbulent Mixing Book Excerpt:

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author: Anonim
Publsiher: Unknown
Total Pages: 1552
Release: 1992
ISBN: 1928374650XXX
Category: Aeronautics
Language: EN, FR, DE, ES & NL

Scientific and Technical Aerospace Reports Book Excerpt:

Advances in Compressible Turbulent Mixing

Advances in Compressible Turbulent Mixing
Author: Anonim
Publsiher: Unknown
Total Pages: 634
Release: 1992
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Advances in Compressible Turbulent Mixing Book Excerpt:

This volume includes some recent additions to original material prepared for the Princeton International Workshop on the Physics of Compressible Turbulent Mixing, held in 1988. Workshop participants were asked to emphasize the physics of the compressible mixing process rather than measurement techniques or computational methods. Actual experimental results and their meaning were given precedence over discussions of new diagnostic developments. Theoretical interpretations and understanding were stressed rather than the exposition of new analytical model developments or advances in numerical procedures. By design, compressibility influences on turbulent mixing were discussed--almost exclusively--from the perspective of supersonic flow field studies. The papers are arranged in three topical categories: Foundations, Vortical Domination, and Strongly Coupled Compressibility. The Foundations category is a collection of seminal studies that connect current study in compressible turbulent mixing with compressible, high-speed turbulent flow research that almost vanished about two decades ago. A number of contributions are included on flow instability initiation, evolution, and transition between the states of unstable flow onset through those descriptive of fully developed turbulence. The Vortical Domination category includes theoretical and experimental studies of coherent structures, vortex pairing, vortex-dynamics-influenced pressure focusing. In the Strongly Coupled Compressibility category the organizers included the high-speed turbulent flow investigations in which the interaction of shock waves could be considered an important source for production of new turbulence or for the enhancement of pre-existing turbulence. Individual papers are processed separately.

Transitional and Turbulent Compressible Flows 1995

Transitional and Turbulent Compressible Flows  1995
Author: L. D. Kral,Eric Francis Spina,Chūichi Arakawa
Publsiher: Unknown
Total Pages: 217
Release: 1995
ISBN: 1928374650XXX
Category: Compressibility
Language: EN, FR, DE, ES & NL

Transitional and Turbulent Compressible Flows 1995 Book Excerpt:

Numerical Simulation of Shock Turbulent Boundary Layer Interaction

Numerical Simulation of Shock Turbulent Boundary Layer Interaction
Author: National Aeronautics and Space Adm Nasa
Publsiher: Unknown
Total Pages: 48
Release: 2018-11
ISBN: 9781729357682
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Numerical Simulation of Shock Turbulent Boundary Layer Interaction Book Excerpt:

Most flows of aerodynamic interest are compressible and turbulent. However, our present knowledge on the structures and mechanisms of turbulence is mostly based on incompressible flows. In the present work, compressibility effects in turbulent, high-speed, boundary layer flows are systematically investigated using the Direct Numerical Simulation (DNS) approach. Three-dimensional, time-dependent, fully nonlinear, compressible Navier-Stokes equations were numerically integrated by high-order finite-difference methods; no modeling for turbulence is used during the solution because the available resolution is sufficient to capture the relevant scales. The boundary layer problem deals with fully-turbulent compressible flows over flat geometries. Apart from its practical relevance to technological flows, turbulent compressible boundary layer flow is the simplest experimentally realizable turbulent compressible flow. Still, measuring difficulties prohibit a detailed experimental description of the flow, especially in the near-wall region. DNS studies provide a viable means to probe the physics of compressible turbulence in this region. The focus of this work is to explore the paths of energy transfer through which compressible turbulence is sustained. The structural similarities and differences between the incompressible and compressible turbulence are also investigated. The energy flow patterns or energy cascades are found to be directly related to the evolution of vortical structures which are generated in the near-wall region. Near-wall structures, and mechanisms which are not readily accessible through physical experiments are analyzed and their critical role on the evolution and the behavior of the flow is documented extensively. Biringen, Sedat and Hatay, Ferhat F. Unspecified Center NAG1-1472...

Transitional and Turbulent Compressible Flows

Transitional and Turbulent Compressible Flows
Author: Anonim
Publsiher: Unknown
Total Pages: 135
Release: 1995
ISBN: 1928374650XXX
Category: Compressibility
Language: EN, FR, DE, ES & NL

Transitional and Turbulent Compressible Flows Book Excerpt:

A Compressible Navier Stokes Solver with Two equation and Reynolds Stress Turbulence Closure Models

A Compressible Navier Stokes Solver with Two equation and Reynolds Stress Turbulence Closure Models
Author: Joseph H. Morrison
Publsiher: Unknown
Total Pages: 44
Release: 1992
ISBN: 1928374650XXX
Category: Aerodynamics
Language: EN, FR, DE, ES & NL

A Compressible Navier Stokes Solver with Two equation and Reynolds Stress Turbulence Closure Models Book Excerpt:

On the Basic Equations for the Second Order Modeling of Compressible Turbulence

On the Basic Equations for the Second Order Modeling of Compressible Turbulence
Author: National Aeronautics and Space Administration (NASA)
Publsiher: Createspace Independent Publishing Platform
Total Pages: 28
Release: 2018-07-09
ISBN: 9781722453138
Category: Electronic Book
Language: EN, FR, DE, ES & NL

On the Basic Equations for the Second Order Modeling of Compressible Turbulence Book Excerpt:

Equations for the mean and turbulent quantities for compressible turbulent flows are derived. Both the conventional Reynolds average and the mass-weighted, Favre average were employed to decompose the flow variable into a mean and a turbulent quality. These equations are to be used later in developing second order Reynolds stress models for high speed compressible flows. A few recent advances in modeling some of the terms in the equations due to compressibility effects are also summarized. Liou, W. W. and Shih, T.-H. Glenn Research Center NASA ORDER C-99066-G; RTOP 505-62-21...

Compressible Turbulent Reacting Flows

Compressible Turbulent Reacting Flows
Author: Forman Arthur Williams,Paul A. Libby,S. Sarkar
Publsiher: Unknown
Total Pages: 22
Release: 2000
ISBN: 1928374650XXX
Category: Propulsion systems
Language: EN, FR, DE, ES & NL

Compressible Turbulent Reacting Flows Book Excerpt:

Heat Release Effects on Decaying Homogeneous Compressible Turbulence

Heat Release Effects on Decaying Homogeneous Compressible Turbulence
Author: Kurn Chul Lee
Publsiher: Unknown
Total Pages: 135
Release: 2010
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Heat Release Effects on Decaying Homogeneous Compressible Turbulence Book Excerpt:

High Mach-number compressible flows with heat release are inherently more complicated than incompressible flows due to, among other reasons, the activation of the thermal energy mode. Such flow fields can experience significant fluctuations in density, temperature, viscosity, conductivity and specific heat, which affect velocity and pressure fluctuations. Furthermore, the flow field cannot be assumed to be dilatation-free in high Mach numbers and even in low Mach-number flows involving combustion, or in boundary layers on heated walls. The main issue in these high-speed and highly-compressible flows is the effect of thermal gradients and fluctuations on turbulence. The thermal field has various routes through which it affects flow structures of compressible turbulence. First, it has direct influence through pressure, which affects turbulence via pressure-strain correlation. The indirect effects of thermal fields on compressible turbulence are through the changes in flow properties. The high temperature gradients alter the transport coefficient and compressibility of the flow. The objective of this work is to answer the following questions: How do temperature fluctuations change the compressible flow structure and energetics? How does compressibility in the flow affect the non-linear pressure redistribution process? What is the main effect of spatial transport-coefficient variation? We perform direct numerical simulations (DNS) to answer the above questions. The investigations are categorized into four parts: 1) Turbulent energy cascade and kinetic-internal energy interactions under the influence of temperature fluctuations; 2) Return-to-isotropy of anisotropic turbulence under the influence of large temperature fluctuations; 3) The effect of turbulent Mach number and dilatation level on small-scale (velocity-gradient) dynamics; 4) The effect of variable transport-coefficients (viscosity and diffusivity) on cascade and dissipation processes of turbulence. The findings lead to a better understanding of temperature fluctuation effects on non-linear processes in compressible turbulence. This improved understanding is expected to provide direction for improving second-order closure models of compressible turbulence.

On the Basic Equations for the Second order Modeling of Compressible Turbulence

On the Basic Equations for the Second order Modeling of Compressible Turbulence
Author: W. W. Liou
Publsiher: Unknown
Total Pages: 25
Release: 1991
ISBN: 1928374650XXX
Category: Turbulence
Language: EN, FR, DE, ES & NL

On the Basic Equations for the Second order Modeling of Compressible Turbulence Book Excerpt:

Measurements of Compressible Turbulence Flow Structure in a High speed High Reynolds Number Mixing Layer

Measurements of Compressible Turbulence Flow Structure in a High speed High Reynolds Number Mixing Layer
Author: Rodney D. W. Bowersox
Publsiher: Unknown
Total Pages: 135
Release: 1994
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

Measurements of Compressible Turbulence Flow Structure in a High speed High Reynolds Number Mixing Layer Book Excerpt:

A Near wall Two equation Model for Compressible Turbulent Flows

A Near wall Two equation Model for Compressible Turbulent Flows
Author: Institute for Computer Applications in Science and Engineering,H. S. Zhang
Publsiher: Unknown
Total Pages: 38
Release: 1991
ISBN: 1928374650XXX
Category: Electronic Book
Language: EN, FR, DE, ES & NL

A Near wall Two equation Model for Compressible Turbulent Flows Book Excerpt:

A near-wall two-equation turbulence model of the K - epsilon type is developed for the description of high-speed compressible flows. The Favre- averaged equations of motion are solved in conjunction with modeled transport equations for the turbulent kinetic energy and solenoidal dissipation wherein a variable density extension of the asymptotically consistent near-wall model of So and co-workers is supplemented with new dilatational models. The resulting compressible two-equation model is tested in the supersonic flat plate boundary layer - with an adiabatic wall and with wall cooling - for Mach numbers as large as 10. Direct comparisons of the predictions of the new model with raw experimental data and with results from the K - omega model indicate that it performs well for a wide range of Mach numbers. The surprising finding is that the Morkovin hypothesis, where turbulent dilatational terms are neglected, works well at high Mach numbers provided that the near wall model is asymptotically consistent. Instances where the model predictions deviate from the experiments appear to be attributable to the assumption of constant turbulent Prandtl number - a deficiency that will be addressed in a future paper.

The Analysis and Modeling of Dilatational Terms in Compressible Turbulence

The Analysis and Modeling of Dilatational Terms in Compressible Turbulence
Author: S. Sarkar
Publsiher: Unknown
Total Pages: 31
Release: 1989
ISBN: 1928374650XXX
Category: Fluid mechanics
Language: EN, FR, DE, ES & NL

The Analysis and Modeling of Dilatational Terms in Compressible Turbulence Book Excerpt:

Energy Deposition for High Speed Flow Control

Energy Deposition for High Speed Flow Control
Author: Doyle D. Knight
Publsiher: Cambridge University Press
Total Pages: 465
Release: 2019-02-28
ISBN: 1107123054
Category: Science
Language: EN, FR, DE, ES & NL

Energy Deposition for High Speed Flow Control Book Excerpt:

Describes energy deposition using direct current (DC), microwave and laser discharge for flow control at high speeds.

Large eddy Simulation of Laminar turbulent Breakdown at High Speeds with Dynamic Subgrid scale Modeling

Large eddy Simulation of Laminar turbulent Breakdown at High Speeds with Dynamic Subgrid scale Modeling
Author: Nabil M. El-Hady
Publsiher: Unknown
Total Pages: 60
Release: 1993
ISBN: 1928374650XXX
Category: Boundary layer
Language: EN, FR, DE, ES & NL

Large eddy Simulation of Laminar turbulent Breakdown at High Speeds with Dynamic Subgrid scale Modeling Book Excerpt:

A Compressible Navier Stokes Solver with Two Equation and Reynolds Stress Turbulence Closure Models

A Compressible Navier Stokes Solver with Two Equation and Reynolds Stress Turbulence Closure Models
Author: National Aeronautics and Space Administration (NASA)
Publsiher: Createspace Independent Publishing Platform
Total Pages: 46
Release: 2018-06-27
ISBN: 9781721995936
Category: Electronic Book
Language: EN, FR, DE, ES & NL

A Compressible Navier Stokes Solver with Two Equation and Reynolds Stress Turbulence Closure Models Book Excerpt:

This report outlines the development of a general purpose aerodynamic solver for compressible turbulent flows. Turbulent closure is achieved using either two equation or Reynolds stress transportation equations. The applicable equation set consists of Favre-averaged conservation equations for the mass, momentum and total energy, and transport equations for the turbulent stresses and turbulent dissipation rate. In order to develop a scheme with good shock capturing capabilities, good accuracy and general geometric capabilities, a multi-block cell centered finite volume approach is used. Viscous fluxes are discretized using a finite volume representation of a central difference operator and the source terms are treated as an integral over the control volume. The methodology is validated by testing the algorithm on both two and three dimensional flows. Both the two equation and Reynolds stress models are used on a two dimensional 10 degree compression ramp at Mach 3, and the two equation model is used on the three dimensional flow over a cone at angle of attack at Mach 3.5. With the development of this algorithm, it is now possible to compute complex, compressible high speed flow fields using both two equation and Reynolds stress turbulent closure models, with the capability of eventually evaluating their predictive performance. Morrison, Joseph H. Unspecified Center NAS1-19320; RTOP 505-59-50-01...

Turbulent Shear Layers in Supersonic Flow

Turbulent Shear Layers in Supersonic Flow
Author: Alexander J. Smits,Jean-Paul Dussauge
Publsiher: Springer Science & Business Media
Total Pages: 410
Release: 2006-05-11
ISBN: 0387263055
Category: Science
Language: EN, FR, DE, ES & NL

Turbulent Shear Layers in Supersonic Flow Book Excerpt:

A good understanding of turbulent compressible flows is essential to the design and operation of high-speed vehicles. Such flows occur, for example, in the external flow over the surfaces of supersonic aircraft, and in the internal flow through the engines. Our ability to predict the aerodynamic lift, drag, propulsion and maneuverability of high-speed vehicles is crucially dependent on our knowledge of turbulent shear layers, and our understanding of their behavior in the presence of shock waves and regions of changing pressure. Turbulent Shear Layers in Supersonic Flow provides a comprehensive introduction to the field, and helps provide a basis for future work in this area. Wherever possible we use the available experimental work, and the results from numerical simulations to illustrate and develop a physical understanding of turbulent compressible flows.

Journal of the Physical Society of Japan

Journal of the Physical Society of Japan
Author: Anonim
Publsiher: Unknown
Total Pages: 135
Release: 1991
ISBN: 1928374650XXX
Category: Physics
Language: EN, FR, DE, ES & NL

Journal of the Physical Society of Japan Book Excerpt: