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Author : K. Toba
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.:/5 (31 download)
Download or read book Some Effects of Surface Curvature on the Laminar Boundary Layer Flow written by K. Toba and published by . This book was released on 1960 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (638 download)
Download or read book Schreiben eines Predigers aus Bresslau von dem Öesterreichischen Ueberfall und der Preussischen Wiedereroberung dieser Königl. Hauptstadt Bresslau written by and published by . This book was released on 1758 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : JAMES SIDNEY MURPHY
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.3/5 (91 download)
Download or read book SOME EFFECTS OF SURFACE CURVATURE ON LAMINAR BOUNDARY-LAYER FLOW. written by JAMES SIDNEY MURPHY and published by . This book was released on 1952 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Albert H. Jeans
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.F/5 ( download)
Download or read book The Effects of Streamwise Concave Curvature on Turbulent Boundary Layer Structure written by Albert H. Jeans and published by . This book was released on 1982 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concave curvature has a relatively large, unpredictable effect on turbulent boundary layers. Some, but not all previous studies suggest that a large-scale, stationary array of counter-rotating vortices exists within the turbulent boundary layer on a concave wall. The objective of the present study was to obtain a qualitative model of the flow field in order to increase our understanding of the underlying physics. A large free-surface water channel was constructed in order to perform a visual study of the flow. Streamwise components of mean velocity and turbulence intensity were measured using a hot film anemometer. The upstream boundary was spanwise uniform with a momentum thickness to radius of curvature of 0.05. Compared to flat wall flow, large-scale, randomly distributed sweeps and ejections were seen in the boundary layer on the concave wall. The sweeps appear to suppress the normal mechanism for turbulence production near the wall by inhibiting the bursting process. The ejections appear to enhance turbulence production in the outer layers as the low speed fluid convected from regions near the wall interacts with the higher speed fluid farther out. The large-scale structures did not occur at fixed spanwise locations, and could not be called roll cells or vortices. (Author).
Author : Milton Clauser
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (437 download)
Download or read book The Effect of Curvature on the Transition from Laminar to Turbulent Boundary Layer written by Milton Clauser and published by . This book was released on 1937 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the flow over the upper surface of a wing, a discrepancy between the predicted and actual point of transition from laminar to turbulent boundary layer has been found. This effect may be due to the comparatively small radius of curvature of the upper surface of the wing. The present tests were undertaken to investigate this effect.
Author : Arloe W. Mayne (Jr.)
Publisher :
ISBN 13 :
Total Pages : 40 pages
Book Rating : 4.3/5 (91 download)
Download or read book A Method for Computing Boundary-layer Flows, Including Normal Pressure Gradient and Longitudinal Curvature Effects written by Arloe W. Mayne (Jr.) and published by . This book was released on 1975 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael J Werle
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.3/5 (91 download)
Download or read book Solutions of the Second-order Boundary-layer Equations for Laminar Incompressible Flow written by Michael J Werle and published by . This book was released on 1968 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use is made of self similarity approach and integral momentum technique to obtain solutions of Van Dyke's second-order boundary-layer equations for laminar incompressible flow. Accurate numerical solutions of the most general self similar equations are tabulated for the four second-order contributions due to vorticity interaction, displacement speed, longitudinal curvature, and transverse curvature. A limited number of closed form solutions are obtained which appear to have special significance at the point of first-order boundary-layer separation. In particular it is found that the displacement speed problem can proceed up to separation for only two values of the second-order pressure gradient. All other cases display an infinite discontinuity at this point. Numerical solutions of a large number of cases for the longitudinal and transverse curvature effects well support an identical conclusion. The integral momentum technique applied (a straight forward extension of the Karmen-Pohlhausen solutions) is found to be oversensitive to approximations and in the final analysis is rejected in favor of locally similar solutions. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)
Download or read book On the Effect of Transverse Curvature in Compressible Laminar Boundary Layer Flow Over Slender Bodies of Revolution written by and published by . This book was released on 1964 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of transverse curvature on the compressible laminar boundary layer flow over slender axisymmetric powerlaw bodies is investigated, employing the momentum integral technique. Pressure gradients are neglected and the body surface is assumed to be insulated. Asymptotic solutions for the skin friction coefficient are derived in the regimes of weak and strong curvature effects. A numerical integration, covering the entire range of curvature effects, was carried out for the cone. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (44 download)
Download or read book Response au seditieux escrit intitulé "L'Esprit de paix" fait en faveur du Mazarin et semé par toute la ville ... written by and published by . This book was released on 1652 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (946 download)
Download or read book The Effects of Convex Surface Curvature on Boundary Layer Separation in Supersonic Flow written by and published by . This book was released on 1956 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jan Raat
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (227 download)
Download or read book On the Effect of Transverse Curvature in Compressible Laminar Boundary Layer Flow Over Slender Bodies of Revolution written by Jan Raat and published by . This book was released on 1964 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of transverse curvature on the compressible laminar boundary layer flow over slender axisymmetric powerlaw bodies is investigated, employing the momentum integral technique. Pressure gradients are neglected and the body surface is assumed to be insulated. Asymptotic solutions for the skin friction coefficient are derived in the regimes of weak and strong curvature effects. A numerical integration, covering the entire range of curvature effects, was carried out for the cone. (Author).
Author : J. S. MURPHY
Publisher :
ISBN 13 :
Total Pages : 1 pages
Book Rating : 4.:/5 (227 download)
Download or read book Extensions of the Falkner - Skan Similar Solutions of the Boundary Layer Equations to Flows with Surface Curvature written by J. S. MURPHY and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results of a study of the effects of longitudinal surface curvature on incompressible laminar boundary layer flows are presented. They were obtained by numerical solution of a generalized Falkner-Skan equation governing similar solutions for flows over curved surfaces. The curvature parameter is essentially the inverse square root of the Reynolds number based on free stream conditions and a characteristic radius of curvature. The results indicate that, for equal flow conditions, boundary layer thickness is greater for flows with convex surface curvature than for those with concave curvature. An important influence of curvature on the velocity profile occurs near the outer edge of the boundary layer where, due to the pressure gradient normal to the surface, the gradient of the velocity component parallel to the surface, in a direction normal to the surface, is negative for convex and positive for concave surfaces in contrast to its value of zero for flows where the curvature correction is neglected. (Author).
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (227 download)
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).
Author : K. D. Papailiou
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (454 download)
Download or read book The Inclusion of Surface Curvature Effects in the Calculation of the Turbulent Boundary Layer with Integral Methods written by K. D. Papailiou and published by . This book was released on 1970 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roger John Leonard
Publisher :
ISBN 13 :
Total Pages : 158 pages
Book Rating : 4.:/5 (292 download)
Download or read book The Effect of Curvature on the Axisymmetrical Laminar Boundary Layer Flow of a Non-Newtonian Power-law Fluid written by Roger John Leonard and published by . This book was released on 1968 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Roddam Narasimha
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (965 download)
Download or read book EFFECT OF LONGITUDINAL SURFACE CURVATURE ON BOUNDARY LAYERS. written by Roddam Narasimha and published by . This book was released on 1967 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alec David Young
Publisher : AIAA (American Institute of Aeronautics & Astronautics)
ISBN 13 :
Total Pages : 296 pages
Book Rating : 4.X/5 (2 download)
Download or read book Boundary Layers written by Alec David Young and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1989 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Following an introduction to the basic physical concepts and the theoretical framework of boundary layers, discussion includes laminar boundary layers, the physics of the transition from laminar to turbulent flow, the turbulent boundary layer and its governing equations in time-averaging form, drag prediction by integral methods, turbulence modeling and differential methods, and current topics and problems in research and industry.
