Drag Reduction Effects In Turbulent Boundary Layers Over Wavy Walls PDF Download
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Author | : Ramakrishna Balasubramanian |
Publisher | : |
Total Pages | : 126 |
Release | : 1980 |
Genre | : Navier-Stokes equations |
ISBN | : |
Download Drag Reduction Effects in Turbulent Boundary Layers Over Wavy Walls Book in PDF, ePub and Kindle
Author | : |
Publisher | : AIAA |
Total Pages | : 542 |
Release | : 1990 |
Genre | : Boundary layer |
ISBN | : 9781600863783 |
Download Viscous Drag Reduction in Boundary Layers Book in PDF, ePub and Kindle
Author | : Ramakrishna Balasubramanian |
Publisher | : |
Total Pages | : 28 |
Release | : 1980 |
Genre | : Drag (Aerodynamics) |
ISBN | : |
Download Analytical and Design Techniques for Drag Reduction Studies on Wavy Surfaces Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 2000 |
Genre | : |
ISBN | : |
Download Drag Reduction for Turbulent Boundary Layer Flows Using an Oscillating Wall Book in PDF, ePub and Kindle
This research program used experimental measurements and computational simulations to study the drag reduction, and the resulting effects on turbulence structure, for a turbulent wall flow subjected to lateral wall oscillations. Major objectives for this study were to establish wall oscillation conditions resulting in maximum drag reduction, and how the turbulence structure was altered so that this drag reduction was attained. Furthermore we were interested in the drag reduction performance over a range of Reynolds numbers, and the onset of the drag reduction at the start of the oscillating wall section, and the decay of drag reduction downstream of the oscillating wall. Our experiments showed the maximum drag reduction for an oscillating wall is 30%. Furthermore, the drag reduction reaches an asymptotic level with increasing wall oscillation velocity, with the maximum level occurring by approximately W sub wp=15. Drag reduction performance was tested for Reynolds numbers of Re theta =500, 950, 1400 and 2400, and the performance was found to be independent of Reynolds number for this range. Experimental and computational studies of the turbulence structure showed the oscillating wall has dramatic effect in practically eliminating the streak structures. Furthermore, the burst and sweep structures were suppressed.
Author | : Robert L. Ash |
Publisher | : |
Total Pages | : 52 |
Release | : 1974 |
Genre | : Drag (Aerodynamics) |
ISBN | : |
Download On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Hans Schmidbauer |
Publisher | : |
Total Pages | : 570 |
Release | : 1936 |
Genre | : Mathematics |
ISBN | : |
Download Behavior of Turbulent Boundary Layers on Curved Convex Walls Book in PDF, ePub and Kindle
The system of linear differential equations which indicated the approach of separation and the so-called "boundary-layer thickness" by Gruschwitz is extended in this report to include the case where the friction layer is subject to centrifugal forces. Evaluation of the data yields a strong functional dependence of the momentum change and wall drag on the boundary-layer thickness radius of curvature ratio for the wall. It is further shown that the transition from laminar to turbulent flow occurs at somewhat higher Reynolds Numbers at the convex wall than at the flat plate, due to the stabilizing effect of the centrifugal forces.
Author | : John C. Lin |
Publisher | : |
Total Pages | : 172 |
Release | : 1984 |
Genre | : Aerodynamics |
ISBN | : |
Download Drag of Two-dimensional Small-amplitude Symmetric and Asymmetric Wavy Walls in Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : Robert L. Ash |
Publisher | : |
Total Pages | : 82 |
Release | : 1973 |
Genre | : Drag (Aerodynamics) |
ISBN | : |
Download On the Theory of Compliant Wall Drag Reduction in Turbulent Boundary Layers Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 174 |
Release | : 1984 |
Genre | : Science |
ISBN | : |
Download NASA Technical Paper Book in PDF, ePub and Kindle
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 32 |
Release | : 2018-08-06 |
Genre | : |
ISBN | : 9781724680730 |
Download Prediction of Compliant Wall Drag Reduction Book in PDF, ePub and Kindle
A numerical model of turbulent boundary layer flows over compliant walls was investigated. The model is based on Burton's observation that outer flow structures in turbulent boundary layers produce large scale pressure fluctuations near the wall. The results of calculations indicate that certain small wavelength wall motions can have a significant effect upon the stability of turbulent boundary layers. Orszag, S. A. Unspecified Center NASA-CR-3071 NAS1-14906