Study of Longitudinal Curvature Effects in Turbulent Boundary Layers with Application to Drag Reduction
Study of Longitudinal Curvature Effects in Turbulent Boundary Layers with Application to Drag Reduction

Author: A. J. Smits

Publisher:

Published: 1985

Total Pages: 19

ISBN-13:

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This work was concerned with a study of subsonic boundary layer behavior downstream of a 90 degree convex bend with a boundary layer thickness of radius-of-curvature ratio of approximately 0.1. Only mean flow results are available. They indicate that the boundary layer, severely distorted when it exits from the curved region, experiences several stages in the recovery process as it relaxes on the flat plate. These stages are described in detail. Keywords: Turbulence.

An Exploratory Theoretical Investigation of the Effect of Longitudinal Surface Curvature on the Turbulent Boundary Layer
An Exploratory Theoretical Investigation of the Effect of Longitudinal Surface Curvature on the Turbulent Boundary Layer

Author: Neal Tetervin

Publisher:

Published: 1969

Total Pages: 92

ISBN-13:

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The equations of motion and total enthalpy are derived for a compressible turbulent boundary layer on an axisymmetric or two-dimensional surface with non-negligible longitudinal curvature. From these equations are derived the integral-momentum, kinetic-energy, and total-enthalpy equations for non-negligible longitudinal curvature. Calculations indicate that if concave curvature increases the skin friction sufficiently separation is delayed although the boundary layer is thickened. Also, an increase in curvature in the direction in which the surface pressure rises acts to hasten separation for concave curvature and delay it for convex curvature. (Author).

Viscous Drag Reduction in Boundary Layers
Viscous Drag Reduction in Boundary Layers

Author: Dennis M. Bushnell

Publisher: AIAA (American Institute of Aeronautics & Astronautics)

Published: 1990

Total Pages: 544

ISBN-13:

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Timely in two respects: the first is the growing awareness of the need for energy conservation in both transportation and process industries. The second is the recent emergence and application of several viscous drag reduction techniques. Laminar as well as turbulent flows are covered as are active

Compressible Turbulent Boundary Layer Computations for Flow with Longitudinal Curvature
Compressible Turbulent Boundary Layer Computations for Flow with Longitudinal Curvature

Author: Walter B. Sturek

Publisher:

Published: 1975

Total Pages: 32

ISBN-13:

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A numerical study has been performed using a finite-difference boundary layer computer program that includes corrections to the equations of motion for longitudinal curvature and allows the static pressure to be specified as a known function of x and y. Calculations with and without the corrections for longitudinal curvature and pressure gradient normal to be the local surface have been compared to experimental measurements of a supersonic turbulent boundary layer flow over a surface with concave longitudinal curvature. Substantially improved agreement with experimental measurements is obtained for the calculations including corrections for wall curvature and pressure gradient normal to the local surface for density profile, skin friction coefficient, and boundary-layer integral properties.

Report
Report

Author: United States. National Bureau of Standards

Publisher:

Published: 1968

Total Pages: 696

ISBN-13:

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