Generalized Wall Function For Complex Turbulent Flows
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A Generalized Wall Function
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 34 |
Release | : 2018-06-15 |
Genre | : |
ISBN | : 9781721188932 |
The asymptotic solutions, described by Tennekes and Lumley (1972), for surface flows in a channel, pipe or boundary layer at large Reynolds numbers are revisited. These solutions can be extended to more complex flows such as the flows with various pressure gradients, zero wall stress and rough surfaces, etc. In computational fluid dynamics (CFD), these solutions can be used as the boundary conditions to bridge the near-wall region of turbulent flows so that there is no need to have the fine grids near the wall unless the near-wall flow structures are required to resolve. These solutions are referred to as the wall functions. Furthermore, a generalized and unified law of the wall which is valid for whole surface layer (including viscous sublayer, buffer layer and inertial sublayer) is analytically constructed. The generalized law of the wall shows that the effect of both adverse and favorable pressure gradients on the surface flow is very significant. Such as unified wall function will be useful not only in deriving analytic expressions for surface flow properties but also bringing a great convenience for CFD methods to place accurate boundary conditions at any location away from the wall. The extended wall functions introduced in this paper can be used for complex flows with acceleration, deceleration, separation, recirculation and rough surfaces. Shih, Tsan-Hsing and Povinelli, Louis A. and Liu, Nan-Suey and Potapczuk, Mark G. and Lumley, J. L. Glenn Research Center NASA/TM-1999-209398, NAS 1.15:209398, E-11834, ICOMP-99-08
Engineering Turbulence Modelling and Experiments 5
Author | : W. Rodi |
Publisher | : Elsevier |
Total Pages | : 1029 |
Release | : 2002-08-21 |
Genre | : Mathematics |
ISBN | : 008053094X |
Turbulence is one of the key issues in tackling engineering flow problems. As powerful computers and accurate numerical methods are now available for solving the flow equations, and since engineering applications nearly always involve turbulence effects, the reliability of CFD analysis depends increasingly on the performance of the turbulence models. This series of symposia provides a forum for presenting and discussing new developments in the area of turbulence modelling and measurements, with particular emphasis on engineering-related problems. The papers in this set of proceedings were presented at the 5th International Symposium on Engineering Turbulence Modelling and Measurements in September 2002. They look at a variety of areas, including: Turbulence modelling; Direct and large-eddy simulations; Applications of turbulence models; Experimental studies; Transition; Turbulence control; Aerodynamic flow; Aero-acoustics; Turbomachinery flows; Heat transfer; Combustion systems; Two-phase flows. These papers are preceded by a section containing 6 invited papers covering various aspects of turbulence modelling and simulation as well as their practical application, combustion modelling and particle-image velocimetry.
Complex Turbulent Flows: Comparison of computation with experiment, and computers' summary reports
Author | : Stephen J. Kline |
Publisher | : |
Total Pages | : 528 |
Release | : 1981 |
Genre | : Fluid dynamics |
ISBN | : |
Analysis of Turbulent Boundary Layers
Author | : Tuncer Cebeci |
Publisher | : Elsevier |
Total Pages | : 423 |
Release | : 2012-12-02 |
Genre | : Technology & Engineering |
ISBN | : 0323151051 |
Analysis of Turbulent Boundary Layers focuses on turbulent flows meeting the requirements for the boundary-layer or thin-shear-layer approximations. Its approach is devising relatively fundamental, and often subtle, empirical engineering correlations, which are then introduced into various forms of describing equations for final solution. After introducing the topic on turbulence, the book examines the conservation equations for compressible turbulent flows, boundary-layer equations, and general behavior of turbulent boundary layers. The latter chapters describe the CS method for calculating two-dimensional and axisymmetric laminar and turbulent boundary layers. This book will be useful to readers who have advanced knowledge in fluid mechanics, especially to engineers who study the important problems of design.
Turbulence: Numerical Analysis, Modelling and Simulation
Author | : William Layton |
Publisher | : MDPI |
Total Pages | : 229 |
Release | : 2018-05-04 |
Genre | : Mathematics |
ISBN | : 3038428094 |
This book is a printed edition of the Special Issue "Turbulence: Numerical Analysis, Modelling and Simulation" that was published in Fluids