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Compressibility Turbulence And High Speed Flow

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Compressibility Turbulence and High Speed Flow

Compressibility  Turbulence and High Speed Flow Book
Author : Thomas B. Gatski,Jean-Paul Bonnet
Publisher : Academic Press
Release : 2013-03-05
ISBN : 012397318X
Language : En, Es, Fr & De

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Book Description :

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

Compressibility Effects on Turbulence in High Speed Flows

Compressibility Effects on Turbulence in High Speed Flows Book
Author : H. Ha Minh,D. D. Vandromme
Publisher : Unknown
Release : 1989
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Compressibility Effects on Turbulence in High Speed Flows book written by H. Ha Minh,D. D. Vandromme, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Numerical Simulation of Shock Turbulent Boundary Layer Interaction

Numerical Simulation of Shock Turbulent Boundary Layer Interaction Book
Author : National Aeronautics and Space Adm Nasa
Publisher : Unknown
Release : 2018-11
ISBN : 9781729357682
Language : En, Es, Fr & De

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Book Description :

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...

The Analysis and Modeling of Dilatational Terms in Compressible Turbulence

The Analysis and Modeling of Dilatational Terms in Compressible Turbulence Book
Author : S. Sarkar
Publisher : Unknown
Release : 1989
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download The Analysis and Modeling of Dilatational Terms in Compressible Turbulence book written by S. Sarkar, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Catalogue d une importante collection d objets d art et de curiosit

Catalogue d une importante collection d objets d art et de curiosit      Book
Author : Anonim
Publisher : Unknown
Release : 1867
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Catalogue d une importante collection d objets d art et de curiosit book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Journal of the Physical Society of Japan

Journal of the Physical Society of Japan Book
Author : Nihon Butsuri Gakkai
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Journal of the Physical Society of Japan book written by Nihon Butsuri Gakkai, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Turbulent Shear Layers in Supersonic Flow

Turbulent Shear Layers in Supersonic Flow Book
Author : Alexander J. Smits,Jean-Paul Dussauge
Publisher : Springer Science & Business Media
Release : 2006-05-11
ISBN : 0387263055
Language : En, Es, Fr & De

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Book Description :

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.

Advances in Compressible Turbulent Mixing

Advances in Compressible Turbulent Mixing Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

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

On the Basic Equations for the Second Order Modeling of Compressible Turbulence Book
Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
Release : 2018-10-18
ISBN : 9781728924809
Language : En, Es, Fr & De

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Book Description :

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

Transitional and Turbulent Compressible Flows 1995

Transitional and Turbulent Compressible Flows  1995 Book
Author : L. D. Kral,Eric Francis Spina,Chūichi Arakawa
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Transitional and Turbulent Compressible Flows 1995 book written by L. D. Kral,Eric Francis Spina,Chūichi Arakawa, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Research and Technology 1990

Research and Technology 1990 Book
Author : Anonim
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Transitional and Turbulent Compressible Flows

Transitional and Turbulent Compressible Flows Book
Author : Anonim
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Numerical Simulations of Compressible Homogeneous Turbulence

Numerical Simulations of Compressible Homogeneous Turbulence Book
Author : Gregory A. Blaisdell,Nagi N. Mansour,Stanford University. Thermosciences Division,William C. Reynolds
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Numerical Simulations of Compressible Homogeneous Turbulence book written by Gregory A. Blaisdell,Nagi N. Mansour,Stanford University. Thermosciences Division,William C. Reynolds, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Transitional and Turbulent Compressible Flows 1993

Transitional and Turbulent Compressible Flows  1993 Book
Author : American Society of Mechanical Engineers. Fluids Engineering Division
Publisher : Amer Society of Mechanical
Release : 1993
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Transitional and Turbulent Compressible Flows 1993 book written by American Society of Mechanical Engineers. Fluids Engineering Division, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Heat Release Effects on Decaying Homogeneous Compressible Turbulence

Heat Release Effects on Decaying Homogeneous Compressible Turbulence Book
Author : Kurn Chul Lee
Publisher : Unknown
Release : 2010
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

35th Aerospace Sciences Meeting Exhibit

35th Aerospace Sciences Meeting   Exhibit Book
Author : Anonim
Publisher : Unknown
Release : 1997
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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A Near wall Two equation Model for Compressible Turbulent Flows

A Near wall Two equation Model for Compressible Turbulent Flows Book
Author : Institute for Computer Applications in Science and Engineering,H. S. Zhang
Publisher : Unknown
Release : 1991
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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.

Study of Compressible Turbulent Flows in Supersonic Environment by Large eddy Simulation

Study of Compressible Turbulent Flows in Supersonic Environment by Large eddy Simulation Book
Author : Franklin Marie Genin
Publisher : Unknown
Release : 2009
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

A Large-Eddy Simulation (LES) methodology adapted to the resolution of high Reynolds number turbulent flows in supersonic conditions was proposed and developed. A novel numerical scheme was designed, that switches from a low-dissipation central scheme for turbulence resolution to a flux difference splitting scheme in regions of discontinuities. Furthermore, a state-of-the-art closure model was extended in order to take compressibility effects and the action of shock / turbulence interaction into account. The proposed method was validated against fundamental studies of high speed flows and shock / turbulence interaction studies. This new LES approach was employed for the study of shock / turbulent shear layer interaction as a mixing-augmentation technique, and highlighted the efficiency in mixing improvement after the interaction, but also the limited spatial extent of this turbulent enhancement. A second practical study was conducted by simulating the injection of a sonic jet normally to a supersonic crossflow. The validity of the simulation was assessed by comparison with experimental data, and the dynamics of the interaction was examined. The sources of vortical structures were identified, with a particular emphasis on the impact of the flow speed onto the vortical evolution.