Near-wall modelling of compressible turbulent flows

a semi-annual progress report
  • 3.61 MB
  • 7894 Downloads
  • English

Arizona State University, NASA Langley Research Center, For sale by the National Technical Information Service , Tempe, Ariz, Hampton, VA, [Springfield, Va
Jets -- Fluid dynamics., Combustion engineering -- United States., Compressible flow., Flow distribution., K-Epsilon turbulence model., Reynolds stress., Turbulent flow., Wall
Other titlesNear wall modelling of compressible turbulent flows.
Statementby Ronald M.C. So.
SeriesNASA CR -- 186961., NASA contractor report -- NASA CR-186961.
ContributionsArizona State University., Langley Research Center.
The Physical Object
FormatMicroform
Pagination1 v.
ID Numbers
Open LibraryOL16129966M

Near-wall model for Reynolds stresses and heat fluxes. The present project attempts to accomplish these objectives using the approach outlined by Lai and So [1,2] in their modelling of incompressible near-wall Reynolds stresses and heat fluxes.

More specifically, the present objectives can be. Summary A near-wall two-equation model for compressible flows is proposed. The model is formulated by relaxing the assumption of dynamical field similarity between compressible and incompressible flows.

A postulate is made to justify the extension of incompressible models to account for compressibility effects. Get this from a library. Near-wall modelling of compressible turbulent flows: a semi-annual progress report. [Ronald M C So; Arizona State University.; Langley Research Center.].

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.

A near-wall two-equation model for compressible flows is proposed. The model is formulated by relaxing the assumption of dynamic field similarity between compressible and incompressible flows.

Description Near-wall modelling of compressible turbulent flows FB2

A postulate is made to justify the extension of incompressible models to ammount for compressibility effects. This requires formulation the turbulent. Get this from a library. Near-wall modelling of compressible turbulent flows. [Ronald M C So; United States.

National Aeronautics and Space Administration.]. Near-wall modelling of compressible turbulent flows. By Ronald M. Abstract. Work was carried out to extend the near-wall models formulated for the incompressible Reynolds stress equations to compressible flows. The idea Near-wall modelling of compressible turbulent flows book splitting the compressible dissipation function into a solenoidal part that is not sensitive to changes of Author: Ronald M.

The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section. Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and more.

Near-wall modelling of compressible turbulent flows.

Details Near-wall modelling of compressible turbulent flows FB2

By Ronald M. Abstract. Work was carried out to formulate near-wall models for the equations governing the transport of the temperature-variance and its dissipation rate. With these equations properly modeled, a foundation is laid for Near-wall modelling of compressible turbulent flows book extension together with the heat-flux Author: Ronald M.

On Near Wall Turbulent Flow Modelling. R.M.C. The behavior of various terms in the Reynolds-stress transport equations is evaluated in view results of near-wall turbulence characterizations which show that all components of the velocity-pressure gradient correlation vanish at the wall. Publisher Summary.

The existence of a shock in a turbulent flow can significantly affect both the mean field and turbulence dynamics in the vicinity of the shock.

Over a half-century, experimental, numerical, and theoretical studies have attempted to quantify the dynamic characteristics of such flows. The book consists of two parts followed by a number of appendices.

Download Near-wall modelling of compressible turbulent flows EPUB

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 flows. A near-wall two-equation model for compressible flows is proposed.

The model is formulated by relaxing the assumption of dynamic field similarity between compressible and incompressible flows. A postulate is made to justify the extension of incompressible models to ammount for compressibility effects.

This requires formulation the turbulent kinetic energy equation in a form similar to its. Computation of shock wave/turbulent boundary layer interactions using a two-equation model with compressibility corrections Applied Scientific Research, Vol. 51, No. Near-wall two-equation model for compressible turbulent flows.

model and experimental data. That of the unsteady axisymmetric turbulent flow within a cylinder of reciprocating model engine including port/valve assembly and the spray characteristics within a chamber of direct injection model engine are compared to these from the standard n.

model and experimental data. The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are explored in the experimental methods section.

Special topics include modeling of near wall turbulent flows, compressible turbulent flows, and s: 1. Subgrid-Scale Modelling in the Near-Wall Region of Turbulent Wall-Bounded Flows A dynamic mixed subgrid‐scale model and its application to turbulent recirculating flows Physics of Fluids A: Fluid Dynamics, Vol.

5, No. 12Cited by: 1. Turbulent flows under rapidly changing volume 2. Homogeneous compressible turbulence 3. Shock wave-turbulence interaction 4. Turbulence and mixing in high speed flows 5. Instabilities in compressible flows 6.

Advanced experimental methods for compressible flows. About this book. Introduction. This second edition of our book extends the modeling and calculation of boundary-layer flows to include compressible flows.

The subjects cover laminar, transitional and turbulent boundary layers for two- and three-dimensional incompressible and compressible flows. Modelling of compressible turbulent flows - Present possibilities and perspectives Closure Law, Compressible Flow, Flow Equations, Mathematical Models, Turbulent Flow, Computerized Simulation, Eddy Viscosity, Navier-Stokes Equation, Reynolds Stress, Three Dimensional Models, Turbulence Models 13H: Abstract Possibilities.

This second edition of our book extends the modeling and calculation of boundary-layer flows to include compressible flows. The subjects cover laminar, transitional and turbulent boundary layers for two- and three-dimensional incompressible and compressible flows.

This page was last modified on 22 Marchat This page has been acces times. Content is available under GNU Free Documentation License Not until the middle of the last century did texts on the subject begin to appear in the form of monographs focused on either homogeneous turbulence (Batchelor, Homogeneous turbulence, ) where theoretical analysis was tractable or turbulent shear flows (Townsend, The structure of turbulent shear flows, ) where the emphasis shifted to the extensive experimental results that had been gathered.

A compressible near-wall two-equation model is derived by relaxing the assumption of dynamical field similarity between compressible and incompressible flows. This requires justifications for extending the incompressible models to compressible flows and the formulation of the turbulent kinetic energy equation in a form similar to its incompressible counterpart.

The measurement of turbulent fluctuations experiments in isothermal and stratified turbulent flows are covered in the experimental methods section. There are also special topics on modelling of near wall turbulent flows and compressible turbulent flows. About the Author:Format: Hardcover.

Large Eddy Simulation (LES) of compressible flows is still a widely unexplored area of research. The authors, whose books are considered the most relevant monographs in this field, provide the reader with a comprehensive state-of-the-art presentation of the available LES theory and by:   (1).

Real world flows are mostly turbulent flows. (2). Turbulence in engineering applications comes from the wall boundary layers and free shear layers. Large Eddy Simulation (LES) of compressible flows is still a widely unexplored area of research.

The authors, whose books are considered the most relevant monographs in this field, provide the reader with a comprehensive state-of-the-art presentation of the available LES theory and application. The full text of 95 contributed papers cover a broad range of topics in near-wall turbulent flows that includes boundary layers, coherent structures, drag reduction, experimental methods, high speed flows, numerical simulations, transition and turbulent modeling.

Some new developments of explicit algebraic Reynolds stress turbulence models (EARSM) are presented. The new developments include a new near-wall treatment ensuring realizability for the individual stress components, a formulation for compressible flows, and a suggestion for a possible approximation of diffusion terms in the anisotropy transport by:.

The RANS models can be closed in one of the following ways (1) Eddy Viscosity Models (via the Boussinesq hypothesis) zBoussinesq hypothesis – Reynolds stresses are modeled using an eddy (or turbulent) viscosity, µT.

The hypothesis is reasonable for simple turbulent shear flows: boundary layers, round jets, mixing layers, channel flows, Size: 1MB.Simulation of Turbulent Flows • From the Navier-Stokes to the RANS equations • Turbulence modeling • k-ε model(s) • Near-wall turbulence modeling (typically a one-equation k-based model) for the near-wall The separation between the two regions is defined in terms of a distance from the wall (y+~30).Modeling and computation of boundary-layer flows: laminar, turbulent and transitional boundary layers in incompressible and compressible flows Tuncer Cebeci, Jean Cousteix This book is an introduction to computational fluid dynamics with emphasis on the modeling and calculation of boundary-layer flows.