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Book Advanced Computational Fluid and Aerodynamics

Download or read book Advanced Computational Fluid and Aerodynamics written by Paul G. Tucker and published by Cambridge University Press. This book was released on 2016-03-15 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book outlines the computational fluid dynamics evolution and gives an overview of the methods available to the engineer.

Book Numerical Investigation of Turbulent Channel Flow

Download or read book Numerical Investigation of Turbulent Channel Flow written by and published by . This book was released on 1981 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Investigation on the Interaction Between Surface Roughness and Viscous Flows

Download or read book Numerical Investigation on the Interaction Between Surface Roughness and Viscous Flows written by Wade William Huebsch and published by . This book was released on 2000 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last 60 years, there has been a great deal of research aimed at determining the impact of surface roughness on fluid flow and the mechanisms by which the resulting flow phenomena occur. The effects of surface roughness include increases in drag the likelihood of flow separation, and the ability to trigger premature transition to turbulent flow. The primary concern for aircraft performance is surface roughness on the leading edge of an airfoil, which can adversely affect the design characteristics. The research to date has examined many problems in this area and has continued to expand the knowledge base, but many gaps still exist for a full understanding of the roughness-fluid interaction. In this study, a numerical investigation is conducted to examine the impact of surface roughness on external viscous flows. The focus of this study is on different types of airfoil leading-edge roughness and how these surface perturbations interact with the external flow field. The freestream conditions are varied to include both steady and unsteady flow at a constant angle-of-attack or in pitch-up.

Book Numerical Investigation of Surface Curvature Effects in Compressible Turbulent Flows

Download or read book Numerical Investigation of Surface Curvature Effects in Compressible Turbulent Flows written by and published by . This book was released on 1994 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this work has been to develop a direct numerical simulation capability for compressible, non-canonical wall-bounded flows which is directly applicable to actual flight vehicles. Data from the simulations is used to educe information about the organized motion. In the flow and bow they are affected by the extra strain rates due to concave wall curvature. A second-order finite volume approach and both fourth-order and sixth-order compact differences are available for the spatial derivatives. The algorithm allows for generalized coordinates so that simulations about complex geometries can be performed. Extensive testing was done for two subgrid-scale models, the compressible Smagoriusky and structure function models, for a supersonic boundary layer. As the subgrid-scale viscosity also behaves as an artificial viscosity for central differencing codes, the study reinforced the need for high-order dissipation models in the simulation code. Validation of the numerical method was performed for flow over a concave surface for subsonic flow in which streamwise vortices develop in the boundary-layer due to the Gortler instability. The geometry and flow conditions closely approximated the incompressible experiments of Swearingen and Blackwelder. The simulations captured the essential features of the experiments in which counter-rotating vortices developed near the wall. As these streamwise vortices develop, the laminar boundary layer on the concave wall rapidly becomes three-dimensional. Higher-momentum fluid is pulled towards the wall from the outer flow as vortices grow downstream. The low-speed fluid lying between the vortices induces low-momentum fluid away from the wall, leading to inflectional streamwise velocity profiles, in good agreement with the experiments. (AN).

Book Numerical investigation of turbulent flow through parallel channels connected by a gap

Download or read book Numerical investigation of turbulent flow through parallel channels connected by a gap written by M. Biemueller and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Investigation of Turbulent Flow Bounded by a Wall and a Free slip Surface

Download or read book Numerical Investigation of Turbulent Flow Bounded by a Wall and a Free slip Surface written by Kin Leung Lam and published by . This book was released on 1989 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Computation of Laminar and Turbulent Flow in Curved Ducts Channels and Pipes Using the Navier Stokes Equations

Download or read book Computation of Laminar and Turbulent Flow in Curved Ducts Channels and Pipes Using the Navier Stokes Equations written by R. C. Buggeln and published by . This book was released on 1980 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Both laminar and turbulent flows in strongly curved ducts, channels, and pipes are studied by numerical methods. The study concentrates on the curved square-duct geometry and flow conditions for which detailed measurements have been obtained recently by Taylor, Whitelaw, and Yianneskis. The solution methodology encompasses solution of the compressible ensemble-averaged Navier-Stokes equations at low Mach number using a split linearized block implicit (LBI) scheme, and rapid convergence on the order of 80 noniterative time steps is obtained. The treatment of turbulent flows includes resolution of the viscous sublayer region. A series of solutions for both laminar and turbulent flow and for both two- and three-dimensional geometries of the same curvature are presented. The accuracy of these solutions is explored by mesh refinement and by comparison with experiment. In summary, good qualitative and reasonable quantitative agreement between solution and experiment is obtained. Collectively, this sequence of results serves to clarify the physical structure of these flows and hence how grid selection procedures might be adjusted to improve the numerical accuracy and experimental agreement. For a three-dimensional flow of considerable complexity, the relatively good agreement with experiment obtained for the turbulent flow case despite a coarse grid must be regarded as encouraging. (Author).

Book Turbulence in Open Channel Flows

Download or read book Turbulence in Open Channel Flows written by Hiroji Nakagawa and published by Routledge. This book was released on 2017-10-02 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: A review of open channel turbulence, focusing especially on certain features stemming from the presence of the free surface and the bed of a river. Part one presents the statistical theory of turbulence; Part two addresses the coherent structures in open-channel flows and boundary layers.

Book Turbulence Over a Compliant Surface

Download or read book Turbulence Over a Compliant Surface written by Sheng Xu and published by . This book was released on 2002 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Numerical Simulation of Unsteady Flows and Transition to Turbulence

Download or read book Numerical Simulation of Unsteady Flows and Transition to Turbulence written by O. Pironneau and published by Cambridge University Press. This book was released on 1992-07-31 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: The workshop concentrated on the following turbulence test cases: T1 Boundary layer in an S-shaped duct; T2 Periodic array of cylinders in a channel; T3 Transition in a boundary layer under the influence of free-stream turbulence; T4 & T5: Axisymmetric confined jet flows.

Book Turbulent Flows

Download or read book Turbulent Flows written by Jean Piquet and published by Springer Science & Business Media. This book was released on 2001-03-26 with total page 778 pages. Available in PDF, EPUB and Kindle. Book excerpt: obtained are still severely limited to low Reynolds numbers (about only one decade better than direct numerical simulations), and the interpretation of such calculations for complex, curved geometries is still unclear. It is evident that a lot of work (and a very significant increase in available computing power) is required before such methods can be adopted in daily's engineering practice. I hope to l"Cport on all these topics in a near future. The book is divided into six chapters, each· chapter in subchapters, sections and subsections. The first part is introduced by Chapter 1 which summarizes the equations of fluid mechanies, it is developed in C~apters 2 to 4 devoted to the construction of turbulence models. What has been called "engineering methods" is considered in Chapter 2 where the Reynolds averaged equations al"C established and the closure problem studied (§1-3). A first detailed study of homogeneous turbulent flows follows (§4). It includes a review of available experimental data and their modeling. The eddy viscosity concept is analyzed in §5 with the l"Csulting ~alar-transport equation models such as the famous K-e model. Reynolds stl"Css models (Chapter 4) require a preliminary consideration of two-point turbulence concepts which are developed in Chapter 3 devoted to homogeneous turbulence. We review the two-point moments of velocity fields and their spectral transforms (§ 1), their general dynamics (§2) with the particular case of homogeneous, isotropie turbulence (§3) whel"C the so-called Kolmogorov's assumptions are discussed at length.