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Book Analysis of Turbulent Boundary Layers

Download or read book Analysis of Turbulent Boundary Layers written by Tuncer Cebeci and published by Elsevier. This book was released on 2012-12-02 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Book The Calculation of Compressible Transitional Turbulent and Relaminarizational Boundary Layers Over Smooth and Rough Surfaces Using an Extended Mixing Length Hypothesis

Download or read book The Calculation of Compressible Transitional Turbulent and Relaminarizational Boundary Layers Over Smooth and Rough Surfaces Using an Extended Mixing Length Hypothesis written by B. K. Hodge and published by . This book was released on 1978 with total page 103 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical calculations based on the compressible boundary-layer equations and an integral form of the kinetic-energy-of-turbulence (IKET) equation are presented for a variety of conditions. The addition of the IKET equation permits the streamwise computation of an additional dependent variable normally taken as an empirical constant in conventional mixing-length formulations. A baseline turbulence model is developed and then modified to account for the effects of favorable and adverse pressure gradients, roughness, and transpiration. Examples given include adverse and favorable pressure gradients, relaminarization, acoustic-energy-induced transition, surface roughness, and transpiration. The IKET-based extended mixing-length hypothesis is shown to be considerably more flexible than conventional mixing-length turbulence models. (Author).

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book R solution Du Probl me Des Couches Limites Turbullentes Compressibles Bidimensionnelles Au Moyen Des Mod les de Turbulence K e Et de Longueur de M lange Accrue

Download or read book R solution Du Probl me Des Couches Limites Turbullentes Compressibles Bidimensionnelles Au Moyen Des Mod les de Turbulence K e Et de Longueur de M lange Accrue written by M. Khalid and published by NRCC, Institute for Aerospace Research. This book was released on 1990 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Two equation Low Reynolds number Turbulence Modeling of Transitional Boundary Layer Flows Characteristic of Gas Turbine Blades

Download or read book Two equation Low Reynolds number Turbulence Modeling of Transitional Boundary Layer Flows Characteristic of Gas Turbine Blades written by Rodney C. Schmidt and published by . This book was released on 1987 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Elements of Transitional Boundary Layer Flowlements

Download or read book Elements of Transitional Boundary Layer Flowlements written by Robert Edward Mayle and published by Logos Verlag Berlin GmbH. This book was released on 2018 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: Second Enhanced Edition Suitable for advanced-level courses or an independent study in fluid mechanics, this text by an expert in the field provides the basic aspects of laminar-to-turbulent flow transition in boundary layers. Logically organized into three major parts, the book covers pre- and post-transitional flow, transitional flow, and several advanced topics in periodically disturbed transitional flow. Some of the subjects covered within the book include high-frequency unsteady laminar flow, turbulent flow, natural transition, bypass transition, turbulent spot theory, turbulent spot kinematics and production, correlations for the onset and rate of transition, global and conditional averaging, transitional flow models, wakeinduced transition, multimode transition, and separated-flow transition. Containing some 202 figures (all drawn by the author), 28 tables, 12 appendices, a supplement on tensors, and an extensive bibliography, the 415 page book provides a wealth of data and information about the subject.

Book Turbent Boundary Layer Solution for Two dimensional Compressible Flow Using Mixing Length and K dissipation Rate Turbulence Models

Download or read book Turbent Boundary Layer Solution for Two dimensional Compressible Flow Using Mixing Length and K dissipation Rate Turbulence Models written by National Aeronautical Establishment (Canada) and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Solution of the Equations for Compressible Laminar Transitional and Turbulent Boundary Layers and Comparisons with Experimental Data

Download or read book Numerical Solution of the Equations for Compressible Laminar Transitional and Turbulent Boundary Layers and Comparisons with Experimental Data written by Julius E. Harris and published by . This book was released on 1971 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical method for solving the equations for laminar, transitional, and turbulent compressible boundary layers for either planar or axisymmetric flows is presented. The fully developed turbulent region is treated by replacing the Reynolds stress terms with an eddy viscosity model. The mean properties of the transitional boundary layer are calculated by multiplying the eddy viscosity by an intermittency function based on the statistical production and growth of the turbulent spots. A specifiable turbulent Prandtl number relates the turbulent flux of heat to the eddy viscosity. A three-point implicit finite-difference scheme is used to solve the system of equations. The momentum and energy equations are solved simultaneously without iteration. Numerous test cases are compared with experimental data for supersonic and hypersonic flows; these cases include flows with both favorable and mildly unfavorable pressure gradient histories, mass flux at the wall, and traverse curvature.

Book Comparison of Several Mixing Length Models for Turbulent Boundary layer Computations

Download or read book Comparison of Several Mixing Length Models for Turbulent Boundary layer Computations written by Y. Y. Chan and published by 1970.. This book was released on 1970 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational method for turbulent boundary layers in an incompressible two-dimensional flow was formulated. The governing differential equations for the mean flow are solved by an implicit finite differential equations for the mean flow are solved by an implicit finite difference method. The Reynolds shear stress is correlated by Prandtl's mixing length concept. Four models of correlation for the mixing length are studied and prediction based on these models is assessed by comparison with several sets of experimental data. It is found that models correlated only to local mean flow cannot adjust themselves to the proper turbulent state for highly non-equilibrium flow. If the turbulent state is considered explicitly by computing the mixing length from the turbulent energy equation, the results show excellent agreement with experimental data. This model is thus recommended for practical uses. (Author).

Book Assessment of One and Two Equation Turbulence Models for Hypersonic Transitional Flows

Download or read book Assessment of One and Two Equation Turbulence Models for Hypersonic Transitional Flows written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many Navier-Stokes codes require that the governing equations be written in conservation form with a source term. The Spalart-Allmaras one-equation model was originally developed in substantial derivative form and when rewritten in conservation form, a density gradient term appears in the source term. This density gradient term causes numerical problems and has a small influence on the numerical predictions. Further work has been performed to understand and to justify the neglect of this term. The transition trip term has been included in the one-equation eddy viscosity model of Spalart-Allmaras. Several problems with this model have been discovered when applied to high-speed flows. For the Mach 8 flat plate boundary layer flow with the standard transition method, the Baldwin-Barth and both k-[omega] models gave transition at the specified location. The Spalart-Allmaras and low Reynolds number k-[var-epsilon] models required an increase in the freestream turbulence levels in order to give transition at the desired location. All models predicted the correct skin friction levels in both the laminar and turbulent flow regions. For Mach 8 flat plate case, the transition location could not be controlled with the trip terms as given in the Spalart-Allmaras model. Several other approaches have been investigated to allow the specification of the transition location. The approach that appears most appropriate is to vary the coefficient that multiplies the turbulent production term in the governing partial differential equation for the eddy viscosity (Method 2). When this coefficient is zero, the flow remains laminar. The coefficient is increased to its normal value over a specified distance to crudely model the transition region and obtain fully turbulent flow. While this approach provides a reasonable interim solution, a separate effort should be initiated to address the proper transition procedure associated with the turbulent production term. Also, the transition process might be better modeled with the Spalart-Allmaras turbulence model with modification of the damping function f[sub v1]. The damping function could be set to zero in the laminar flow region and then turned on through the transition flow region.

Book Turbulence Modeling for CFD CD ROM

Download or read book Turbulence Modeling for CFD CD ROM written by David C. Wilcox and published by . This book was released on 2006 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Calculation of Compressible Nonadiabatic Boundary Layers in Laminar Transitional and Turbulent Flow by the Method of Integral Relations

Download or read book Calculation of Compressible Nonadiabatic Boundary Layers in Laminar Transitional and Turbulent Flow by the Method of Integral Relations written by Gary D. Kuhn and published by . This book was released on 1971 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: